[
  {
    "sku": "21322",
    "brand": "FAG",
    "manufacturer_designation": "FAG 21322-E1-XL-TVPB",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 240,
    "B_mm": 50,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 600,
    "static_load_kN": 640,
    "fatigue_load_limit_kN": 70,
    "max_rpm": 4000,
    "reference_speed_rpm": 2700,
    "limiting_speed_rpm": 4000,
    "weight_g": 11060,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "21322 is a double-row spherical roller bearing in the 21300-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by FAG in Schaeffler catalogue HR1. Reading the designation: the leading 2 marks a spherical roller bearing, the 13 is the ISO 15 dimension series (dimension series 13 (heavy OD, normal width)), and the last two digits encode the 110 mm bore; the 240 mm OD and 50 mm width follow the ISO 15 general plan. The FAG suffix chain reads E1 (X-life internal design with increased load ratings) plus TVPB (glass-fibre reinforced polyamide window cage); a K in the middle of the designation (e.g. 21322-E1-XL-K-TVPB) marks the 1:12 tapered-bore variant for adapter-sleeve mounting. Selection arithmetic: the C0/C ratio is about 1.07 (static 640 kN against dynamic 600 kN), typical of a spherical roller sized for heavy combined loads, and the 70 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. After mounting, swing the outer ring to confirm free self-alignment: the 21322 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.",
    "applications": [
      "jaw and cone crusher main shafts",
      "paper-machine press and dryer rolls",
      "rolling-mill pinion and back-up shafts",
      "large vibrating screens and feeders"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Mount the 110 mm bore 21322 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 21300-series series at 110 mm bore (240×50 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.",
      "Catalogue reference speed and limiting speed are different limits: the 2,700 r/min reference is a thermal criterion under load, while the 4,000 r/min limiting value is the mechanical ceiling — observe both.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 21322 pits long before its L10 life.",
      "The 600/640 kN ratings are FAG catalogue values for this exact execution (21322-E1-XL-TVPB); FAG can revise internal geometry without changing the order number, so keep the catalogue version (Schaeffler catalogue HR1) with the specification and re-verify for critical drives.",
      "FAG lists several executions of 21322 (cylindrical bore as listed, tapered-bore 21322-E1-XL-K variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 21322-E1-XL-TVPB designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21322?",
        "a": "The 21322-E1-XL-TVPB is a double-row spherical roller bearing with 110 mm bore, 240 mm outer diameter and 50 mm width (4.331 × 9.449 × 1.969 in) per ISO 15. From Schaeffler catalogue HR1: basic dynamic load rating C 600 kN, C0 640 kN, fatigue load limit Pu 70 kN, reference speed 2,700 r/min, limiting speed 4,000 r/min, mass about 11060 g. It is an open, self-aligning bearing with a glass-fibre reinforced polyamide (PA66) window cage."
      },
      {
        "q": "How does the 21322 bore code work?",
        "a": "The last two digits of 21322 are bore code 22, so 22 × 5 = 110 mm bore. The 240 mm OD and 50 mm width come from the ISO 15 dimension-series plan (dimension series 13 (heavy OD, normal width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the E1-XL-TVPB suffix mean on 21322?",
        "a": "E1-XL is the Schaeffler X-life internal design with increased load ratings, and TVPB marks a glass-fibre reinforced polyamide window cage rated to 120 °C. The K variant (21322-E1-XL-K-TVPB) has a 1:12 tapered bore for adapter-sleeve mounting."
      },
      {
        "q": "Can 21322 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 21322K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 21322 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21322-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "21322",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.schaeffler.com/en/products-and-solutions/rolling-and-plain-bearings/",
    "catalog_ver": "Schaeffler HR1 (2022 ed.), spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21322",
      "21322-E1-XL-TVPB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22205EAKW33",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22205EAKW33",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 57.3,
    "static_load_kN": 46.1,
    "fatigue_load_limit_kN": 3.23,
    "limiting_speed_rpm": 10400,
    "max_rpm": 10400,
    "speed_oil_rpm": 13000,
    "weight_g": 169,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22205EAKW33 with a 1:12 tapered bore (K) and W33 annular lubrication groove with outer-ring holes: 25 mm bore, 52 mm OD, 18 mm width, rated 10,400 r/min on grease. Digit by digit the code reads as spherical-roller dimension series plus 25 mm bore; the 18 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. At 57.3 kN C and 169 g mass the 22200 series part is built for shock and vibration; the 18 mm-wide ring needs square abutments to keep both rows equally loaded. Equivalent-load planning keeps a radial plus moderate axial combination on 22205EAKW33; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Never mount 22205EAKW33 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 52 mm race.",
    "applications": [
      "light conveyor pulleys and drum shafts",
      "small agricultural and forestry machinery",
      "medium fan and blower shafts with belt pull",
      "small reducer and gearbox output shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 25 mm bore the two-row set is sensitive to over-greasing: pack only the calculated volume around the W33 feature or churning heat cancels the 10,400 r/min speed rating.",
      "Never substitute 22205EAKW33 by envelope alone: the 46.1 kN C0 and 3.23 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22205EAW33: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Oil relubrication toward 13,000 r/min needs drain and level design; flooding the 18 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 10,400 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 57.3/46.1 kN ratings, 3.23 kN Pu and 169 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22205EAKW33 (EA pressed-steel-cage/W33); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22205EAKW33?",
        "a": "22205EAKW33 is an NTN double-row spherical roller bearing to ISO 15: 25 mm bore, 52 mm OD and 18 mm width (0.984 × 2.047 × 0.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 57.3 kN, C0 46.1 kN, Pu 3.23 kN, grease limiting speed 10,400 r/min, oil 13,000 r/min, mass about 169 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22205EAKW33 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22205EAW33."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22205EAKW33 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22205EAKW33?",
        "a": "W33 denotes the annular lubrication groove with holes in the outer ring: the housing grease port feeds the groove and both roller rows directly. On NTN executions the same feature is spelled D1 in the NTN suffix language; 22205EAKW33 carries W33."
      },
      {
        "q": "How much misalignment and axial load can 22205EAKW33 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 57.3 kN C / 46.1 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22205EAW33",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22205EAW33 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22205eakw33",
      "＊22205eakw33",
      "22205EAKW33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22205EAW33",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22205EAW33",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 57.3,
    "static_load_kN": 46.1,
    "fatigue_load_limit_kN": 3.23,
    "limiting_speed_rpm": 10400,
    "max_rpm": 10400,
    "speed_oil_rpm": 13000,
    "weight_g": 173,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22205EAW33 is the EA pressed-steel-cage execution of NTN's spherical roller range for a 25 mm shaft — 57.3 kN basic dynamic capacity in a 173 g, open ISO 15 envelope. Numbering ties 22205EAW33 to its envelope and execution: same-number EA versus EM or plain variants share the 25 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Open by design, 22205EAW33 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Equivalent-load planning keeps a radial plus moderate axial combination on 22205EAW33; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "medium fan and blower shafts with belt pull",
      "small reducer and gearbox output shafts",
      "construction-mixer and small crusher shafts",
      "textile and paper converting rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 25 mm bore the two-row set is sensitive to over-greasing: pack only the calculated volume around the W33 feature or churning heat cancels the 10,400 r/min speed rating.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 18 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 22205EAW33 by envelope alone: the 46.1 kN C0 and 3.23 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 18 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 57.3 kN rating no longer applies.",
      "The 57.3/46.1 kN ratings, 3.23 kN Pu and 173 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22205EAW33 (EA pressed-steel-cage/W33); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22205EAW33?",
        "a": "22205EAW33 is an NTN double-row spherical roller bearing to ISO 15: 25 mm bore, 52 mm OD and 18 mm width (0.984 × 2.047 × 0.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 57.3 kN, C0 46.1 kN, Pu 3.23 kN, grease limiting speed 10,400 r/min, oil 13,000 r/min, mass about 173 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22205EAW33 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22205EAKW33 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22205EAW33 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22205EAW33?",
        "a": "W33 denotes the annular lubrication groove with holes in the outer ring: the housing grease port feeds the groove and both roller rows directly. On NTN executions the same feature is spelled D1 in the NTN suffix language; 22205EAW33 carries W33."
      },
      {
        "q": "How much misalignment and axial load can 22205EAW33 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 57.3 kN C / 46.1 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22205EAKW33",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22205EAKW33 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22205eaw33",
      "＊22205eaw33",
      "22205EAW33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22205EMKW33",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22205EMKW33",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 57.3,
    "static_load_kN": 46.1,
    "fatigue_load_limit_kN": 3.23,
    "limiting_speed_rpm": 10400,
    "max_rpm": 10400,
    "speed_oil_rpm": 13000,
    "weight_g": 171,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 25 mm shaft, NTN supplies 22205EMKW33: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 13,000 r/min. The leading digits are the ISO 15 dimension series (22200 series); the bore code resolves to 25 mm (two-digit code ×5, with the 00–03 exception table), and 52 mm OD / 18 mm width follow the general plan. Open by design, 22205EMKW33 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. The 13.5 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 18 mm-wide ring seats fully on both sides. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "textile and paper converting rolls",
      "small vibrating-screen and shaker shafts",
      "light conveyor pulleys and drum shafts",
      "small agricultural and forestry machinery"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 25 mm bore the two-row set is sensitive to over-greasing: pack only the calculated volume around the W33 feature or churning heat cancels the 10,400 r/min speed rating.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 25 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Never substitute 22205EMKW33 by envelope alone: the 46.1 kN C0 and 3.23 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 18 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 57.3 kN rating no longer applies.",
      "The 57.3/46.1 kN ratings, 3.23 kN Pu and 171 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22205EMKW33 (EM machined-brass-cage/W33); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22205EMKW33?",
        "a": "22205EMKW33 is an NTN double-row spherical roller bearing to ISO 15: 25 mm bore, 52 mm OD and 18 mm width (0.984 × 2.047 × 0.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 57.3 kN, C0 46.1 kN, Pu 3.23 kN, grease limiting speed 10,400 r/min, oil 13,000 r/min, mass about 171 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22205EMKW33 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22205EMW33."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22205EMKW33 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22205EMKW33?",
        "a": "W33 denotes the annular lubrication groove with holes in the outer ring: the housing grease port feeds the groove and both roller rows directly. On NTN executions the same feature is spelled D1 in the NTN suffix language; 22205EMKW33 carries W33."
      },
      {
        "q": "How much misalignment and axial load can 22205EMKW33 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 57.3 kN C / 46.1 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22205EMW33",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22205EMW33 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22205emkw33",
      "＊22205emkw33",
      "22205EMKW33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22205EMW33",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22205EMW33",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 57.3,
    "static_load_kN": 46.1,
    "fatigue_load_limit_kN": 3.23,
    "limiting_speed_rpm": 10400,
    "max_rpm": 10400,
    "speed_oil_rpm": 13000,
    "weight_g": 174,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22205EMW33 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 25×52×18 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). Reading the full code: the number gives the 25×52 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and W33 annular lubrication groove with outer-ring holes completes the order number. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. The 13.5 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 18 mm-wide ring seats fully on both sides. Never mount 22205EMW33 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 52 mm race.",
    "applications": [
      "small agricultural and forestry machinery",
      "medium fan and blower shafts with belt pull",
      "small reducer and gearbox output shafts",
      "construction-mixer and small crusher shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 25 mm bore the two-row set is sensitive to over-greasing: pack only the calculated volume around the W33 feature or churning heat cancels the 10,400 r/min speed rating.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22205EMW33 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 25 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Do not confuse EA and EM at the same number: 22205EMW33 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 25×52 mm envelope is identical.",
      "Never substitute 22205EMW33 by envelope alone: the 46.1 kN C0 and 3.23 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 57.3/46.1 kN ratings, 3.23 kN Pu and 174 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22205EMW33 (EM machined-brass-cage/W33); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22205EMW33?",
        "a": "22205EMW33 is an NTN double-row spherical roller bearing to ISO 15: 25 mm bore, 52 mm OD and 18 mm width (0.984 × 2.047 × 0.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 57.3 kN, C0 46.1 kN, Pu 3.23 kN, grease limiting speed 10,400 r/min, oil 13,000 r/min, mass about 174 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22205EMW33 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22205EMKW33 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22205EMW33 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22205EMW33?",
        "a": "W33 denotes the annular lubrication groove with holes in the outer ring: the housing grease port feeds the groove and both roller rows directly. On NTN executions the same feature is spelled D1 in the NTN suffix language; 22205EMW33 carries W33."
      },
      {
        "q": "How much misalignment and axial load can 22205EMW33 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 57.3 kN C / 46.1 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22205EMKW33",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22205EMKW33 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22205emw33",
      "＊22205emw33",
      "22205EMW33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22206EAKW33",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22206EAKW33",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 75.7,
    "static_load_kN": 64.5,
    "fatigue_load_limit_kN": 4.58,
    "limiting_speed_rpm": 8800,
    "max_rpm": 8800,
    "speed_oil_rpm": 11000,
    "weight_g": 272,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 22206EAKW33 denotes the 30 mm bore spherical roller bearing (75.7 kN C / 64.5 kN C0) in the 22200 series, the self-aligning choice for heavy combined load. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (K), lubrication feature (W33); 22206EAKW33 is assembled exactly in that order. NTN prints two speeds for 22206EAKW33: 8,800 r/min grease and 11,000 r/min oil — the gap of 2,200 r/min reflects oil cooling of the heavy roller set. Selection: the C0/C ratio of 0.85 (64.5/75.7 kN) reflects the heavy static and shock proportioning of 22206EAKW33; size the equivalent load at the required L10 with shock factor for the application. Fillet radii on shaft and housing must clear the ring chamfers of the 20 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts",
      "stone crusher and screen eccentric shafts",
      "papermaking and printing press rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Vibrating-duty 30 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22206EAKW33 is greased for life.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22206EAW33: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 30 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22206EAW33: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Oil relubrication toward 11,000 r/min needs drain and level design; flooding the 20 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 75.7/64.5 kN ratings, 4.58 kN Pu and 272 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22206EAKW33 (EA pressed-steel-cage/W33); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22206EAKW33?",
        "a": "22206EAKW33 is an NTN double-row spherical roller bearing to ISO 15: 30 mm bore, 62 mm OD and 20 mm width (1.181 × 2.441 × 0.787 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 75.7 kN, C0 64.5 kN, Pu 4.58 kN, grease limiting speed 8,800 r/min, oil 11,000 r/min, mass about 272 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22206EAKW33 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22206EAW33."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22206EAKW33 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22206EAKW33?",
        "a": "W33 denotes the annular lubrication groove with holes in the outer ring: the housing grease port feeds the groove and both roller rows directly. On NTN executions the same feature is spelled D1 in the NTN suffix language; 22206EAKW33 carries W33."
      },
      {
        "q": "How much misalignment and axial load can 22206EAKW33 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 75.7 kN C / 64.5 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22206EAW33",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22206EAW33 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22206eakw33",
      "＊22206eakw33",
      "22206EAKW33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22206EAW33",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22206EAW33",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 75.7,
    "static_load_kN": 64.5,
    "fatigue_load_limit_kN": 4.58,
    "limiting_speed_rpm": 8800,
    "max_rpm": 8800,
    "speed_oil_rpm": 11000,
    "weight_g": 278,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22206EAW33 is the EA pressed-steel-cage execution of NTN's spherical roller range for a 30 mm shaft — 75.7 kN basic dynamic capacity in a 278 g, open ISO 15 envelope. Reading the full code: the number gives the 30×62 mm envelope, EA names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and W33 annular lubrication groove with outer-ring holes completes the order number. The W33 annular lubrication groove with outer-ring holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Equivalent-load planning keeps a radial plus moderate axial combination on 22206EAW33; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22206EAW33 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "marine propulsion auxiliary shafts",
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Vibrating-duty 30 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22206EAW33 is greased for life.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 30 mm bearing, and drive-up procedures differ.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 8,800 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Do not confuse EA and EM at the same number: 22206EAW33 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 30×62 mm envelope is identical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 30 mm bearing, and drive-up procedures differ.",
      "The 75.7/64.5 kN ratings, 4.58 kN Pu and 278 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22206EAW33 (EA pressed-steel-cage/W33); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22206EAW33?",
        "a": "22206EAW33 is an NTN double-row spherical roller bearing to ISO 15: 30 mm bore, 62 mm OD and 20 mm width (1.181 × 2.441 × 0.787 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 75.7 kN, C0 64.5 kN, Pu 4.58 kN, grease limiting speed 8,800 r/min, oil 11,000 r/min, mass about 278 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22206EAW33 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22206EAKW33 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22206EAW33 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22206EAW33?",
        "a": "W33 denotes the annular lubrication groove with holes in the outer ring: the housing grease port feeds the groove and both roller rows directly. On NTN executions the same feature is spelled D1 in the NTN suffix language; 22206EAW33 carries W33."
      },
      {
        "q": "How much misalignment and axial load can 22206EAW33 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 75.7 kN C / 64.5 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22206EAKW33",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22206EAKW33 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22206eaw33",
      "＊22206eaw33",
      "22206EAW33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22206EMKW33",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22206EMKW33",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 75.7,
    "static_load_kN": 64.5,
    "fatigue_load_limit_kN": 4.58,
    "limiting_speed_rpm": 8800,
    "max_rpm": 8800,
    "speed_oil_rpm": 11000,
    "weight_g": 275,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22206EMKW33 is the EM machined-brass-cage execution of NTN's spherical roller range for a 30 mm shaft — 75.7 kN basic dynamic capacity in a 275 g, open ISO 15 envelope. Reading the full code: the number gives the 30×62 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and W33 annular lubrication groove with outer-ring holes completes the order number. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Speed planning: 8,800 r/min grease limiting speed is the cage/kinematic ceiling and 11,000 r/min is the oil-lubricated value for the 30 mm bore; vibrating screens rarely approach either and are load/cage limited instead. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22206EMKW33 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "marine propulsion auxiliary shafts",
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Vibrating-duty 30 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22206EMKW33 is greased for life.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 75.7 kN rating no longer applies.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a W33 22206EMKW33 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22206EMKW33 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22206EMKW33 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 75.7/64.5 kN ratings, 4.58 kN Pu and 275 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22206EMKW33 (EM machined-brass-cage/W33); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22206EMKW33?",
        "a": "22206EMKW33 is an NTN double-row spherical roller bearing to ISO 15: 30 mm bore, 62 mm OD and 20 mm width (1.181 × 2.441 × 0.787 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 75.7 kN, C0 64.5 kN, Pu 4.58 kN, grease limiting speed 8,800 r/min, oil 11,000 r/min, mass about 275 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22206EMKW33 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22206EMW33."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22206EMKW33 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22206EMKW33?",
        "a": "W33 denotes the annular lubrication groove with holes in the outer ring: the housing grease port feeds the groove and both roller rows directly. On NTN executions the same feature is spelled D1 in the NTN suffix language; 22206EMKW33 carries W33."
      },
      {
        "q": "How much misalignment and axial load can 22206EMKW33 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 75.7 kN C / 64.5 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22206EMW33",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22206EMW33 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22206emkw33",
      "＊22206emkw33",
      "22206EMKW33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22206EMW33",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22206EMW33",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 75.7,
    "static_load_kN": 64.5,
    "fatigue_load_limit_kN": 4.58,
    "limiting_speed_rpm": 8800,
    "max_rpm": 8800,
    "speed_oil_rpm": 11000,
    "weight_g": 281,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22206EMW33 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 30×62×20 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). Numbering ties 22206EMW33 to its envelope and execution: same-number EA versus EM or plain variants share the 30 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Equivalent-load planning keeps a radial plus moderate axial combination on 22206EMW33; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22206EMW33 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "pump and fan shafts under heavy belt load",
      "marine propulsion auxiliary shafts",
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "Vibrating-duty 30 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22206EMW33 is greased for life.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 30 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Oil relubrication toward 11,000 r/min needs drain and level design; flooding the 20 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Never substitute 22206EMW33 by envelope alone: the 64.5 kN C0 and 4.58 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22206EMW33 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 75.7/64.5 kN ratings, 4.58 kN Pu and 281 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22206EMW33 (EM machined-brass-cage/W33); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22206EMW33?",
        "a": "22206EMW33 is an NTN double-row spherical roller bearing to ISO 15: 30 mm bore, 62 mm OD and 20 mm width (1.181 × 2.441 × 0.787 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 75.7 kN, C0 64.5 kN, Pu 4.58 kN, grease limiting speed 8,800 r/min, oil 11,000 r/min, mass about 281 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22206EMW33 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22206EMKW33 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22206EMW33 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22206EMW33?",
        "a": "W33 denotes the annular lubrication groove with holes in the outer ring: the housing grease port feeds the groove and both roller rows directly. On NTN executions the same feature is spelled D1 in the NTN suffix language; 22206EMW33 carries W33."
      },
      {
        "q": "How much misalignment and axial load can 22206EMW33 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 75.7 kN C / 64.5 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22206EMKW33",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22206EMKW33 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22206emw33",
      "＊22206emw33",
      "22206EMW33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22207EAKW33",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22207EAKW33",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 35,
    "D_mm": 72,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 100,
    "static_load_kN": 92,
    "fatigue_load_limit_kN": 6.11,
    "limiting_speed_rpm": 7500,
    "max_rpm": 7500,
    "speed_oil_rpm": 9400,
    "weight_g": 430,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22207EAKW33 with a 1:12 tapered bore (K) and W33 annular lubrication groove with outer-ring holes: 35 mm bore, 72 mm OD, 23 mm width, rated 7,500 r/min on grease. The leading digits are the ISO 15 dimension series (22200 series); the bore code resolves to 35 mm (two-digit code ×5, with the 00–03 exception table), and 72 mm OD / 23 mm width follow the general plan. Suffix reading on 22207EAKW33: EA identifies the high-capacity execution with a pressed sheet-steel window cage; K marks the 1:12 tapered bore; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and W33 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. Pu 6.11 kN against C0 92 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22207EAKW33 moves with cleanliness far more than with small C variations. Fillet radii on shaft and housing must clear the ring chamfers of the 23 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts",
      "stone crusher and screen eccentric shafts",
      "papermaking and printing press rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Vibrating-duty 35 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22207EAKW33 is greased for life.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 7,500 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22207EAW33: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Do not confuse EA and EM at the same number: 22207EAKW33 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 35×72 mm envelope is identical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 23 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 100/92 kN ratings, 6.11 kN Pu and 430 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22207EAKW33 (EA pressed-steel-cage/W33); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22207EAKW33?",
        "a": "22207EAKW33 is an NTN double-row spherical roller bearing to ISO 15: 35 mm bore, 72 mm OD and 23 mm width (1.378 × 2.835 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 100 kN, C0 92 kN, Pu 6.11 kN, grease limiting speed 7,500 r/min, oil 9,400 r/min, mass about 430 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22207EAKW33 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22207EAW33."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22207EAKW33 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22207EAKW33?",
        "a": "W33 denotes the annular lubrication groove with holes in the outer ring: the housing grease port feeds the groove and both roller rows directly. On NTN executions the same feature is spelled D1 in the NTN suffix language; 22207EAKW33 carries W33."
      },
      {
        "q": "How much misalignment and axial load can 22207EAKW33 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 100 kN C / 92 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22207EAW33",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22207EAW33 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22207eakw33",
      "＊22207eakw33",
      "22207EAKW33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22207EAW33",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22207EAW33",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 35,
    "D_mm": 72,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 100,
    "static_load_kN": 92,
    "fatigue_load_limit_kN": 6.11,
    "limiting_speed_rpm": 7500,
    "max_rpm": 7500,
    "speed_oil_rpm": 9400,
    "weight_g": 438,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22207EAW33 is the EA pressed-steel-cage execution of NTN's spherical roller range for a 35 mm shaft — 100 kN basic dynamic capacity in a 438 g, open ISO 15 envelope. Numbering ties 22207EAW33 to its envelope and execution: same-number EA versus EM or plain variants share the 35 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The 18.5 mm radial section over the 35 mm bore carries two roller rows; capacity per millimetre of bore is about 2.9 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. 35 mm bore is 1.378 in and 72 mm OD is 2.835 in; the ISO 15 envelope swaps between brands, but the 100/92 kN ratings and cage design are NTN 2203E values. Never mount 22207EAW33 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 72 mm race.",
    "applications": [
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts",
      "stone crusher and screen eccentric shafts",
      "papermaking and printing press rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Vibrating-duty 35 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22207EAW33 is greased for life.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a W33 22207EAW33 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 23 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 7,500 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The cylindrical-bore 22207EAW33 and its tapered-bore counterpart 22207EAKW33 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 100/92 kN ratings, 6.11 kN Pu and 438 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22207EAW33 (EA pressed-steel-cage/W33); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22207EAW33?",
        "a": "22207EAW33 is an NTN double-row spherical roller bearing to ISO 15: 35 mm bore, 72 mm OD and 23 mm width (1.378 × 2.835 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 100 kN, C0 92 kN, Pu 6.11 kN, grease limiting speed 7,500 r/min, oil 9,400 r/min, mass about 438 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22207EAW33 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22207EAKW33 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22207EAW33 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22207EAW33?",
        "a": "W33 denotes the annular lubrication groove with holes in the outer ring: the housing grease port feeds the groove and both roller rows directly. On NTN executions the same feature is spelled D1 in the NTN suffix language; 22207EAW33 carries W33."
      },
      {
        "q": "How much misalignment and axial load can 22207EAW33 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 100 kN C / 92 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22207EAKW33",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22207EAKW33 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22207eaw33",
      "＊22207eaw33",
      "22207EAW33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22207EMKW33",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22207EMKW33",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 35,
    "D_mm": 72,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 100,
    "static_load_kN": 92,
    "fatigue_load_limit_kN": 6.11,
    "limiting_speed_rpm": 7500,
    "max_rpm": 7500,
    "speed_oil_rpm": 9400,
    "weight_g": 433,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 35 mm shaft, NTN supplies 22207EMKW33: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 9,400 r/min. Numbering ties 22207EMKW33 to its envelope and execution: same-number EA versus EM or plain variants share the 35 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The 18.5 mm radial section over the 35 mm bore carries two roller rows; capacity per millimetre of bore is about 2.9 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Pu 6.11 kN against C0 92 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22207EMKW33 moves with cleanliness far more than with small C variations. Fillet radii on shaft and housing must clear the ring chamfers of the 23 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "pump and fan shafts under heavy belt load",
      "marine propulsion auxiliary shafts",
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Vibrating-duty 35 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22207EMKW33 is greased for life.",
      "Oil relubrication toward 9,400 r/min needs drain and level design; flooding the 23 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Never substitute 22207EMKW33 by envelope alone: the 92 kN C0 and 6.11 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Oil relubrication toward 9,400 r/min needs drain and level design; flooding the 23 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22207EMW33: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 100/92 kN ratings, 6.11 kN Pu and 433 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22207EMKW33 (EM machined-brass-cage/W33); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22207EMKW33?",
        "a": "22207EMKW33 is an NTN double-row spherical roller bearing to ISO 15: 35 mm bore, 72 mm OD and 23 mm width (1.378 × 2.835 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 100 kN, C0 92 kN, Pu 6.11 kN, grease limiting speed 7,500 r/min, oil 9,400 r/min, mass about 433 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22207EMKW33 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22207EMW33."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22207EMKW33 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22207EMKW33?",
        "a": "W33 denotes the annular lubrication groove with holes in the outer ring: the housing grease port feeds the groove and both roller rows directly. On NTN executions the same feature is spelled D1 in the NTN suffix language; 22207EMKW33 carries W33."
      },
      {
        "q": "How much misalignment and axial load can 22207EMKW33 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 100 kN C / 92 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22207EMW33",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22207EMW33 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22207emkw33",
      "＊22207emkw33",
      "22207EMKW33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22207EMW33",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22207EMW33",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 35,
    "D_mm": 72,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 100,
    "static_load_kN": 92,
    "fatigue_load_limit_kN": 6.11,
    "limiting_speed_rpm": 7500,
    "max_rpm": 7500,
    "speed_oil_rpm": 9400,
    "weight_g": 442,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22207EMW33 identifies a 35×72×23 mm (1.378 × 2.835 × 0.906 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Reading the full code: the number gives the 35×72 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and W33 annular lubrication groove with outer-ring holes completes the order number. The W33 annular lubrication groove with outer-ring holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Equivalent-load planning keeps a radial plus moderate axial combination on 22207EMW33; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Fillet radii on shaft and housing must clear the ring chamfers of the 23 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts",
      "stone crusher and screen eccentric shafts",
      "papermaking and printing press rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "Vibrating-duty 35 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22207EMW33 is greased for life.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 100 kN rating no longer applies.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 23 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Oil relubrication toward 9,400 r/min needs drain and level design; flooding the 23 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 35 mm bearing, and drive-up procedures differ.",
      "The 100/92 kN ratings, 6.11 kN Pu and 442 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22207EMW33 (EM machined-brass-cage/W33); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22207EMW33?",
        "a": "22207EMW33 is an NTN double-row spherical roller bearing to ISO 15: 35 mm bore, 72 mm OD and 23 mm width (1.378 × 2.835 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 100 kN, C0 92 kN, Pu 6.11 kN, grease limiting speed 7,500 r/min, oil 9,400 r/min, mass about 442 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22207EMW33 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22207EMKW33 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22207EMW33 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22207EMW33?",
        "a": "W33 denotes the annular lubrication groove with holes in the outer ring: the housing grease port feeds the groove and both roller rows directly. On NTN executions the same feature is spelled D1 in the NTN suffix language; 22207EMW33 carries W33."
      },
      {
        "q": "How much misalignment and axial load can 22207EMW33 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 100 kN C / 92 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22207EMKW33",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22207EMKW33 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22207emw33",
      "＊22207emw33",
      "22207EMW33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22208EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22208EAD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 40,
    "D_mm": 80,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 116,
    "static_load_kN": 105,
    "fatigue_load_limit_kN": 7.78,
    "limiting_speed_rpm": 6800,
    "max_rpm": 6800,
    "speed_oil_rpm": 8500,
    "weight_g": 528,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22208EAD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 40×80×23 mm to ISO 15, with pressed sheet-steel window cage (EA high-capacity design). On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (cylindrical), lubrication feature (D1); 22208EAD1 is assembled exactly in that order. Pu 7.78 kN is the catalogue fatigue load limit for 22208EAD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Catalogue mass 528 g (0.53 kg) for the 40×80×23 mm execution includes the EA pressed-steel-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Fit the cylindrical-bore 22208EAD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "pump and fan shafts under heavy belt load",
      "marine propulsion auxiliary shafts",
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "Vibrating-duty 40 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22208EAD1 is greased for life.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 6,800 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22208EAD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Oil relubrication toward 8,500 r/min needs drain and level design; flooding the 23 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22208EAD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 116/105 kN ratings, 7.78 kN Pu and 528 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22208EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22208EAD1?",
        "a": "22208EAD1 is an NTN double-row spherical roller bearing to ISO 15: 40 mm bore, 80 mm OD and 23 mm width (1.575 × 3.15 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 116 kN, C0 105 kN, Pu 7.78 kN, grease limiting speed 6,800 r/min, oil 8,500 r/min, mass about 528 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22208EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22208EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22208EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22208EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22208EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22208EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 116 kN C / 105 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22208EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22208EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22208ead1",
      "＊22208ead1",
      "22208EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22208EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22208EAKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 40,
    "D_mm": 80,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 116,
    "static_load_kN": 105,
    "fatigue_load_limit_kN": 7.78,
    "limiting_speed_rpm": 6800,
    "max_rpm": 6800,
    "speed_oil_rpm": 8500,
    "weight_g": 518,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22208EAKD1 is the EA pressed-steel-cage execution of NTN's spherical roller range for a 40 mm shaft — 116 kN basic dynamic capacity in a 518 g, open ISO 15 envelope. Reading the full code: the number gives the 40×80 mm envelope, EA names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. Pu 7.78 kN is the catalogue fatigue load limit for 22208EAKD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. The 20.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 23 mm-wide ring seats fully on both sides. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22208EAKD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "stone crusher and screen eccentric shafts",
      "papermaking and printing press rolls",
      "pump and fan shafts under heavy belt load",
      "marine propulsion auxiliary shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Vibrating-duty 40 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22208EAKD1 is greased for life.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22208EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 116 kN rating no longer applies.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 23 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22208EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 116/105 kN ratings, 7.78 kN Pu and 518 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22208EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22208EAKD1?",
        "a": "22208EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 40 mm bore, 80 mm OD and 23 mm width (1.575 × 3.15 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 116 kN, C0 105 kN, Pu 7.78 kN, grease limiting speed 6,800 r/min, oil 8,500 r/min, mass about 518 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22208EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22208EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22208EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22208EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22208EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22208EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 116 kN C / 105 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22208EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22208EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22208eakd1",
      "＊22208eakd1",
      "22208EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22208EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22208EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 40,
    "D_mm": 80,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 110,
    "static_load_kN": 98,
    "fatigue_load_limit_kN": 7.29,
    "limiting_speed_rpm": 6800,
    "max_rpm": 6800,
    "speed_oil_rpm": 8500,
    "weight_g": 529,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22208EMD1 identifies a 40×80×23 mm (1.575 × 3.15 × 0.906 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Numbering ties 22208EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 40 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Pu 7.29 kN is the catalogue fatigue load limit for 22208EMD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. With about 2.8 kN of C per millimetre of the 40 mm bore, 22208EMD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 40 mm set.",
    "applications": [
      "marine propulsion auxiliary shafts",
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Vibrating-duty 40 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22208EMD1 is greased for life.",
      "Do not confuse EA and EM at the same number: 22208EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 40×80 mm envelope is identical.",
      "Never substitute 22208EMD1 by envelope alone: the 98 kN C0 and 7.29 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Never substitute 22208EMD1 by envelope alone: the 98 kN C0 and 7.29 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22208EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 110/98 kN ratings, 7.29 kN Pu and 529 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22208EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22208EMD1?",
        "a": "22208EMD1 is an NTN double-row spherical roller bearing to ISO 15: 40 mm bore, 80 mm OD and 23 mm width (1.575 × 3.15 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 110 kN, C0 98 kN, Pu 7.29 kN, grease limiting speed 6,800 r/min, oil 8,500 r/min, mass about 529 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22208EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22208EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22208EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22208EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22208EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22208EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 110 kN C / 98 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22208EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22208EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22208emd1",
      "＊22208emd1",
      "22208EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22208EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22208EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 40,
    "D_mm": 80,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 110,
    "static_load_kN": 98,
    "fatigue_load_limit_kN": 7.29,
    "limiting_speed_rpm": 6800,
    "max_rpm": 6800,
    "speed_oil_rpm": 8500,
    "weight_g": 519,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22208EMKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 40×80×23 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). Numbering ties 22208EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 40 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Two symmetric roller rows share the load: C 110 kN, C0 98 kN (C0/C ≈ 0.89), with useful axial capacity in either direction alongside the dominant radial load. The 20.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 23 mm-wide ring seats fully on both sides. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22208EMKD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "conveyor pulley and elevator drum shafts",
      "stone crusher and screen eccentric shafts",
      "papermaking and printing press rolls",
      "pump and fan shafts under heavy belt load"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Vibrating-duty 40 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22208EMKD1 is greased for life.",
      "Oil relubrication toward 8,500 r/min needs drain and level design; flooding the 23 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22208EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22208EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 40 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 110/98 kN ratings, 7.29 kN Pu and 519 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22208EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22208EMKD1?",
        "a": "22208EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 40 mm bore, 80 mm OD and 23 mm width (1.575 × 3.15 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 110 kN, C0 98 kN, Pu 7.29 kN, grease limiting speed 6,800 r/min, oil 8,500 r/min, mass about 519 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22208EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22208EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22208EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22208EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22208EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22208EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 110 kN C / 98 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22208EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22208EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22208emkd1",
      "＊22208emkd1",
      "22208EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21308C",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21308C",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 98,
    "static_load_kN": 90,
    "fatigue_load_limit_kN": 12.6,
    "limiting_speed_rpm": 4900,
    "max_rpm": 4900,
    "speed_oil_rpm": 6400,
    "weight_g": 705,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "21308C is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 40×90×23 mm to ISO 15, with pressed-steel cage of the 213-series C design. On the NTN nameplate the suffix cluster after the size reads in order: cage design (C/CK), bore (cylindrical), lubrication feature (none); 21308C is assembled exactly in that order. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the C design-code cage. Pu 12.6 kN against C0 90 kN anchors the contamination derating; for dirty mining duty the adjusted life of 21308C moves with cleanliness far more than with small C variations. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "marine propulsion auxiliary shafts",
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "Vibrating-duty 40 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 21308C is greased for life.",
      "213-series C/CK executions use the C cage/design code — CK adds the 1:12 tapered bore; quote 21308C in full because a C cannot be mounted on an adapter-sleeve tapered seat.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 40 mm bearing, and drive-up procedures differ.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 98 kN rating no longer applies.",
      "Never substitute 21308C by envelope alone: the 90 kN C0 and 12.6 kN Pu are specific to the NTN C design-code execution, and vibrating duty depends heavily on cage identity.",
      "The 98/90 kN ratings, 12.6 kN Pu and 705 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21308C (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21308C?",
        "a": "21308C is an NTN double-row spherical roller bearing to ISO 15: 40 mm bore, 90 mm OD and 23 mm width (1.575 × 3.543 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 98 kN, C0 90 kN, Pu 12.6 kN, grease limiting speed 4,900 r/min, oil 6,400 r/min, mass about 705 g. It is open, with pressed-steel cage of the 213-series C design."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "21308C has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 21308CK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21308C is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21308C?",
        "a": "21308C is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21308C take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 98 kN C / 90 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21308CK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 21308CK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21308c",
      "21308C"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21308CK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21308CK",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 98,
    "static_load_kN": 90,
    "fatigue_load_limit_kN": 12.6,
    "limiting_speed_rpm": 4900,
    "max_rpm": 4900,
    "speed_oil_rpm": 6400,
    "weight_g": 694,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "21308CK is the C design-code execution of NTN's spherical roller range for a 40 mm shaft — 98 kN basic dynamic capacity in a 694 g, open ISO 15 envelope. The leading digits are the ISO 15 dimension series (21300 series); the bore code resolves to 40 mm (two-digit code ×5, with the 00–03 exception table), and 90 mm OD / 23 mm width follow the general plan. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Catalogue mass 694 g (0.69 kg) for the 40×90×23 mm execution includes the C design-code cage and both roller rows; shaft and housing shoulders must support that ring squarely. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "stone crusher and screen eccentric shafts",
      "papermaking and printing press rolls",
      "pump and fan shafts under heavy belt load",
      "marine propulsion auxiliary shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "Vibrating-duty 40 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 21308CK is greased for life.",
      "Never substitute 21308CK by envelope alone: the 90 kN C0 and 12.6 kN Pu are specific to the NTN C design-code execution, and vibrating duty depends heavily on cage identity.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 23 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "213-series C/CK executions use the C cage/design code — CK adds the 1:12 tapered bore; quote 21308CK in full because a C cannot be mounted on an adapter-sleeve tapered seat.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 21308CK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 98/90 kN ratings, 12.6 kN Pu and 694 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21308CK (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21308CK?",
        "a": "21308CK is an NTN double-row spherical roller bearing to ISO 15: 40 mm bore, 90 mm OD and 23 mm width (1.575 × 3.543 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 98 kN, C0 90 kN, Pu 12.6 kN, grease limiting speed 4,900 r/min, oil 6,400 r/min, mass about 694 g. It is open, with pressed-steel cage of the 213-series C design and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 21308CK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 21308C."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21308CK is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21308CK?",
        "a": "21308CK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21308CK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 98 kN C / 90 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21308C",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 21308C — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21308ck",
      "21308CK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22308EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22308EAD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 169,
    "static_load_kN": 152,
    "fatigue_load_limit_kN": 9.36,
    "limiting_speed_rpm": 5400,
    "max_rpm": 5400,
    "speed_oil_rpm": 6600,
    "weight_g": 1020,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22308EAD1 belongs to the 22300 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (22300 series); the bore code resolves to 40 mm (two-digit code ×5, with the 00–03 exception table), and 90 mm OD / 33 mm width follow the general plan. Suffix reading on 22308EAD1: EA identifies the high-capacity execution with a pressed sheet-steel window cage; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. 40 mm bore is 1.575 in and 90 mm OD is 3.543 in; the ISO 15 envelope swaps between brands, but the 169/152 kN ratings and cage design are NTN 2203E values. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 40 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "pump and fan shafts under heavy belt load",
      "marine propulsion auxiliary shafts",
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "Vibrating-duty 40 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22308EAD1 is greased for life.",
      "Do not confuse EA and EM at the same number: 22308EAD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 40×90 mm envelope is identical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 5,400 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The cylindrical-bore 22308EAD1 and its tapered-bore counterpart 22308EAKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 33 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 169/152 kN ratings, 9.36 kN Pu and 1020 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22308EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22308EAD1?",
        "a": "22308EAD1 is an NTN double-row spherical roller bearing to ISO 15: 40 mm bore, 90 mm OD and 33 mm width (1.575 × 3.543 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 169 kN, C0 152 kN, Pu 9.36 kN, grease limiting speed 5,400 r/min, oil 6,600 r/min, mass about 1020 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22308EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22308EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22308EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22308EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22308EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22308EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 169 kN C / 152 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22308EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22308EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22308ead1",
      "＊22308ead1",
      "22308EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22308EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22308EAKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 169,
    "static_load_kN": 152,
    "fatigue_load_limit_kN": 9.36,
    "limiting_speed_rpm": 5400,
    "max_rpm": 5400,
    "speed_oil_rpm": 6600,
    "weight_g": 1000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22308EAKD1 identifies a 40×90×33 mm (1.575 × 3.543 × 1.299 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (K), lubrication feature (D1); 22308EAKD1 is assembled exactly in that order. Open by design, 22308EAKD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Grease/oil ratio: the 5,400 r/min limiting value is .82 of the 6,600 r/min oil value; heavy 33 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 40 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "stone crusher and screen eccentric shafts",
      "papermaking and printing press rolls",
      "pump and fan shafts under heavy belt load",
      "marine propulsion auxiliary shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Vibrating-duty 40 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22308EAKD1 is greased for life.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 169 kN rating no longer applies.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22308EAD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 5,400 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 169 kN rating no longer applies.",
      "The 169/152 kN ratings, 9.36 kN Pu and 1000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22308EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22308EAKD1?",
        "a": "22308EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 40 mm bore, 90 mm OD and 33 mm width (1.575 × 3.543 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 169 kN, C0 152 kN, Pu 9.36 kN, grease limiting speed 5,400 r/min, oil 6,600 r/min, mass about 1000 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22308EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22308EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22308EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22308EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22308EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22308EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 169 kN C / 152 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22308EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22308EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22308eakd1",
      "＊22308eakd1",
      "22308EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22308EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22308EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 169,
    "static_load_kN": 152,
    "fatigue_load_limit_kN": 9.36,
    "limiting_speed_rpm": 5400,
    "max_rpm": 5400,
    "speed_oil_rpm": 6600,
    "weight_g": 1030,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22308EMD1 belongs to the 22300 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. Digit by digit the code reads as spherical-roller dimension series plus 40 mm bore; the 33 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. At 169 kN C and 1030 g mass the 22300 series part is built for shock and vibration; the 33 mm-wide ring needs square abutments to keep both rows equally loaded. 40 mm bore is 1.575 in and 90 mm OD is 3.543 in; the ISO 15 envelope swaps between brands, but the 169/152 kN ratings and cage design are NTN 2203E values. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22308EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "pump and fan shafts under heavy belt load",
      "marine propulsion auxiliary shafts",
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "Vibrating-duty 40 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22308EMD1 is greased for life.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 33 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 33 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 33 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 5,400 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 169/152 kN ratings, 9.36 kN Pu and 1030 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22308EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22308EMD1?",
        "a": "22308EMD1 is an NTN double-row spherical roller bearing to ISO 15: 40 mm bore, 90 mm OD and 33 mm width (1.575 × 3.543 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 169 kN, C0 152 kN, Pu 9.36 kN, grease limiting speed 5,400 r/min, oil 6,600 r/min, mass about 1030 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22308EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22308EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22308EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22308EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22308EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22308EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 169 kN C / 152 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22308EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22308EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22308emd1",
      "＊22308emd1",
      "22308EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22308EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22308EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 169,
    "static_load_kN": 152,
    "fatigue_load_limit_kN": 9.36,
    "limiting_speed_rpm": 5400,
    "max_rpm": 5400,
    "speed_oil_rpm": 6600,
    "weight_g": 1010,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22308EMKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 40 mm bore, 90 mm OD, 33 mm width, rated 5,400 r/min on grease. Digit by digit the code reads as spherical-roller dimension series plus 40 mm bore; the 33 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. Equivalent-load planning keeps a radial plus moderate axial combination on 22308EMKD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "conveyor pulley and elevator drum shafts",
      "stone crusher and screen eccentric shafts",
      "papermaking and printing press rolls",
      "pump and fan shafts under heavy belt load"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Vibrating-duty 40 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22308EMKD1 is greased for life.",
      "Never substitute 22308EMKD1 by envelope alone: the 152 kN C0 and 9.36 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 169 kN rating no longer applies.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22308EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Never substitute 22308EMKD1 by envelope alone: the 152 kN C0 and 9.36 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 169/152 kN ratings, 9.36 kN Pu and 1010 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22308EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22308EMKD1?",
        "a": "22308EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 40 mm bore, 90 mm OD and 33 mm width (1.575 × 3.543 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 169 kN, C0 152 kN, Pu 9.36 kN, grease limiting speed 5,400 r/min, oil 6,600 r/min, mass about 1010 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22308EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22308EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22308EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22308EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22308EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22308EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 169 kN C / 152 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22308EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22308EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22308emkd1",
      "＊22308emkd1",
      "22308EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22209EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22209EAD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 45,
    "D_mm": 85,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 121,
    "static_load_kN": 113,
    "fatigue_load_limit_kN": 8.76,
    "limiting_speed_rpm": 6100,
    "max_rpm": 6100,
    "speed_oil_rpm": 7700,
    "weight_g": 572,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22209EAD1 belongs to the 22200 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. Numbering ties 22209EAD1 to its envelope and execution: same-number EA versus EM or plain variants share the 45 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. At 121 kN C and 572 g mass the 22200 series part is built for shock and vibration; the 23 mm-wide ring needs square abutments to keep both rows equally loaded. Pu 8.76 kN against C0 113 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22209EAD1 moves with cleanliness far more than with small C variations. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 45 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts",
      "stone crusher and screen eccentric shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Vibrating-duty 45 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22209EAD1 is greased for life.",
      "The cylindrical-bore 22209EAD1 and its tapered-bore counterpart 22209EAKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 23 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 23 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 6,100 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 121/113 kN ratings, 8.76 kN Pu and 572 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22209EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22209EAD1?",
        "a": "22209EAD1 is an NTN double-row spherical roller bearing to ISO 15: 45 mm bore, 85 mm OD and 23 mm width (1.772 × 3.346 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 121 kN, C0 113 kN, Pu 8.76 kN, grease limiting speed 6,100 r/min, oil 7,700 r/min, mass about 572 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22209EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22209EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22209EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22209EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22209EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22209EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 121 kN C / 113 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22209EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22209EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22209ead1",
      "＊22209ead1",
      "22209EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22209EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22209EAKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 45,
    "D_mm": 85,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 121,
    "static_load_kN": 113,
    "fatigue_load_limit_kN": 8.76,
    "limiting_speed_rpm": 6100,
    "max_rpm": 6100,
    "speed_oil_rpm": 7700,
    "weight_g": 561,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22209EAKD1 is the EA pressed-steel-cage execution of NTN's spherical roller range for a 45 mm shaft — 121 kN basic dynamic capacity in a 561 g, open ISO 15 envelope. Numbering ties 22209EAKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 45 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. At 121 kN C and 561 g mass the 22200 series part is built for shock and vibration; the 23 mm-wide ring needs square abutments to keep both rows equally loaded. Equivalent-load planning keeps a radial plus moderate axial combination on 22209EAKD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "marine propulsion auxiliary shafts",
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Vibrating-duty 45 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22209EAKD1 is greased for life.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 121 kN rating no longer applies.",
      "Never substitute 22209EAKD1 by envelope alone: the 113 kN C0 and 8.76 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22209EAD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 6,100 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 121/113 kN ratings, 8.76 kN Pu and 561 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22209EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22209EAKD1?",
        "a": "22209EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 45 mm bore, 85 mm OD and 23 mm width (1.772 × 3.346 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 121 kN, C0 113 kN, Pu 8.76 kN, grease limiting speed 6,100 r/min, oil 7,700 r/min, mass about 561 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22209EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22209EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22209EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22209EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22209EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22209EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 121 kN C / 113 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22209EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22209EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22209eakd1",
      "＊22209eakd1",
      "22209EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22209EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22209EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 45,
    "D_mm": 85,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 116,
    "static_load_kN": 106,
    "fatigue_load_limit_kN": 8.24,
    "limiting_speed_rpm": 6100,
    "max_rpm": 6100,
    "speed_oil_rpm": 7700,
    "weight_g": 577,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22209EMD1 belongs to the 22200 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (22200 series); the bore code resolves to 45 mm (two-digit code ×5, with the 00–03 exception table), and 85 mm OD / 23 mm width follow the general plan. NTN prints two speeds for 22209EMD1: 6,100 r/min grease and 7,700 r/min oil — the gap of 1,600 r/min reflects oil cooling of the heavy roller set. Catalogue mass 577 g (0.58 kg) for the 45×85×23 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 45 mm set.",
    "applications": [
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts",
      "stone crusher and screen eccentric shafts",
      "papermaking and printing press rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "Vibrating-duty 45 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22209EMD1 is greased for life.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 6,100 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22209EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 45 mm bearing, and drive-up procedures differ.",
      "Oil relubrication toward 7,700 r/min needs drain and level design; flooding the 23 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 116/106 kN ratings, 8.24 kN Pu and 577 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22209EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22209EMD1?",
        "a": "22209EMD1 is an NTN double-row spherical roller bearing to ISO 15: 45 mm bore, 85 mm OD and 23 mm width (1.772 × 3.346 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 116 kN, C0 106 kN, Pu 8.24 kN, grease limiting speed 6,100 r/min, oil 7,700 r/min, mass about 577 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22209EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22209EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22209EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22209EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22209EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22209EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 116 kN C / 106 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22209EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22209EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22209emd1",
      "＊22209emd1",
      "22209EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22209EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22209EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 45,
    "D_mm": 85,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 116,
    "static_load_kN": 106,
    "fatigue_load_limit_kN": 8.24,
    "limiting_speed_rpm": 6100,
    "max_rpm": 6100,
    "speed_oil_rpm": 7700,
    "weight_g": 566,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22209EMKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 45×85×23 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). Reading the full code: the number gives the 45×85 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. Suffix reading on 22209EMKD1: EM identifies the high-capacity execution with a one-piece machined brass cage; K marks the 1:12 tapered bore; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. The 20.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 23 mm-wide ring seats fully on both sides. Never mount 22209EMKD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 85 mm race.",
    "applications": [
      "pump and fan shafts under heavy belt load",
      "marine propulsion auxiliary shafts",
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Vibrating-duty 45 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22209EMKD1 is greased for life.",
      "Never substitute 22209EMKD1 by envelope alone: the 106 kN C0 and 8.24 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 45 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Never substitute 22209EMKD1 by envelope alone: the 106 kN C0 and 8.24 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 23 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 116/106 kN ratings, 8.24 kN Pu and 566 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22209EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22209EMKD1?",
        "a": "22209EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 45 mm bore, 85 mm OD and 23 mm width (1.772 × 3.346 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 116 kN, C0 106 kN, Pu 8.24 kN, grease limiting speed 6,100 r/min, oil 7,700 r/min, mass about 566 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22209EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22209EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22209EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22209EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22209EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22209EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 116 kN C / 106 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22209EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22209EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22209emkd1",
      "＊22209emkd1",
      "22209EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21309C",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21309C",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 114,
    "static_load_kN": 106,
    "fatigue_load_limit_kN": 14.1,
    "limiting_speed_rpm": 4400,
    "max_rpm": 4400,
    "speed_oil_rpm": 5700,
    "weight_g": 927,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "21309C is the C design-code execution of NTN's spherical roller range for a 45 mm shaft — 114 kN basic dynamic capacity in a 927 g, open ISO 15 envelope. Numbering ties 21309C to its envelope and execution: same-number EA versus EM or plain variants share the 45 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Catalogue mass 927 g (0.93 kg) for the 45×100×25 mm execution includes the C design-code cage and both roller rows; shaft and housing shoulders must support that ring squarely. Fillet radii on shaft and housing must clear the ring chamfers of the 25 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts",
      "stone crusher and screen eccentric shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Vibrating-duty 45 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 21309C is greased for life.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 21309C on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "213-series C/CK executions use the C cage/design code — CK adds the 1:12 tapered bore; quote 21309C in full because a C cannot be mounted on an adapter-sleeve tapered seat.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 21309C in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 21309C on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 114/106 kN ratings, 14.1 kN Pu and 927 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21309C (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21309C?",
        "a": "21309C is an NTN double-row spherical roller bearing to ISO 15: 45 mm bore, 100 mm OD and 25 mm width (1.772 × 3.937 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 114 kN, C0 106 kN, Pu 14.1 kN, grease limiting speed 4,400 r/min, oil 5,700 r/min, mass about 927 g. It is open, with pressed-steel cage of the 213-series C design."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "21309C has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 21309CK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21309C is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21309C?",
        "a": "21309C is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21309C take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 114 kN C / 106 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21309CK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 21309CK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21309c",
      "21309C"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21309CK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21309CK",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 114,
    "static_load_kN": 106,
    "fatigue_load_limit_kN": 14.1,
    "limiting_speed_rpm": 4400,
    "max_rpm": 4400,
    "speed_oil_rpm": 5700,
    "weight_g": 912,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 21309CK identifies a 45×100×25 mm (1.772 × 3.937 × 0.984 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Reading the full code: the number gives the 45×100 mm envelope, C/CK names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Grease/oil ratio: the 4,400 r/min limiting value is .77 of the 5,700 r/min oil value; heavy 25 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Never mount 21309CK by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 100 mm race.",
    "applications": [
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts",
      "stone crusher and screen eccentric shafts",
      "papermaking and printing press rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Vibrating-duty 45 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 21309CK is greased for life.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 114 kN rating no longer applies.",
      "213-series C/CK executions use the C cage/design code — CK adds the 1:12 tapered bore; quote 21309CK in full because a C cannot be mounted on an adapter-sleeve tapered seat.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 45 mm bearing, and drive-up procedures differ.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 45 mm bearing, and drive-up procedures differ.",
      "The 114/106 kN ratings, 14.1 kN Pu and 912 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21309CK (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21309CK?",
        "a": "21309CK is an NTN double-row spherical roller bearing to ISO 15: 45 mm bore, 100 mm OD and 25 mm width (1.772 × 3.937 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 114 kN, C0 106 kN, Pu 14.1 kN, grease limiting speed 4,400 r/min, oil 5,700 r/min, mass about 912 g. It is open, with pressed-steel cage of the 213-series C design and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 21309CK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 21309C."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21309CK is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21309CK?",
        "a": "21309CK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21309CK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 114 kN C / 106 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21309C",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 21309C — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21309ck",
      "21309CK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22309EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22309EAD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 36,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 206,
    "static_load_kN": 187,
    "fatigue_load_limit_kN": 11.8,
    "limiting_speed_rpm": 4600,
    "max_rpm": 4600,
    "speed_oil_rpm": 5700,
    "weight_g": 1370,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22309EAD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 45×100×36 mm to ISO 15, with pressed sheet-steel window cage (EA high-capacity design). Digit by digit the code reads as spherical-roller dimension series plus 45 mm bore; the 36 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Pu 11.8 kN is the catalogue fatigue load limit for 22309EAD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. With about 4.6 kN of C per millimetre of the 45 mm bore, 22309EAD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 45 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts",
      "stone crusher and screen eccentric shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Vibrating-duty 45 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22309EAD1 is greased for life.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 4,600 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 45 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22309EAD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22309EAD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 206/187 kN ratings, 11.8 kN Pu and 1370 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22309EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22309EAD1?",
        "a": "22309EAD1 is an NTN double-row spherical roller bearing to ISO 15: 45 mm bore, 100 mm OD and 36 mm width (1.772 × 3.937 × 1.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 206 kN, C0 187 kN, Pu 11.8 kN, grease limiting speed 4,600 r/min, oil 5,700 r/min, mass about 1370 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22309EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22309EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22309EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22309EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22309EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22309EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 206 kN C / 187 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22309EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22309EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22309ead1",
      "＊22309ead1",
      "22309EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22309EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22309EAKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 36,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 206,
    "static_load_kN": 187,
    "fatigue_load_limit_kN": 11.8,
    "limiting_speed_rpm": 4600,
    "max_rpm": 4600,
    "speed_oil_rpm": 5700,
    "weight_g": 1340,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22309EAKD1 identifies a 45×100×36 mm (1.772 × 3.937 × 1.417 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 45 mm bore; the 36 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Grease/oil ratio: the 4,600 r/min limiting value is .81 of the 5,700 r/min oil value; heavy 36 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 45 mm set.",
    "applications": [
      "marine propulsion auxiliary shafts",
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Vibrating-duty 45 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22309EAKD1 is greased for life.",
      "Oil relubrication toward 5,700 r/min needs drain and level design; flooding the 36 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Do not confuse EA and EM at the same number: 22309EAKD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 45×100 mm envelope is identical.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22309EAD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 45 mm bearing, and drive-up procedures differ.",
      "The 206/187 kN ratings, 11.8 kN Pu and 1340 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22309EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22309EAKD1?",
        "a": "22309EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 45 mm bore, 100 mm OD and 36 mm width (1.772 × 3.937 × 1.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 206 kN, C0 187 kN, Pu 11.8 kN, grease limiting speed 4,600 r/min, oil 5,700 r/min, mass about 1340 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22309EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22309EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22309EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22309EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22309EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22309EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 206 kN C / 187 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22309EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22309EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22309eakd1",
      "＊22309eakd1",
      "22309EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22309EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22309EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 36,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 206,
    "static_load_kN": 187,
    "fatigue_load_limit_kN": 11.8,
    "limiting_speed_rpm": 4600,
    "max_rpm": 4600,
    "speed_oil_rpm": 5700,
    "weight_g": 1380,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22309EMD1 identifies a 45×100×36 mm (1.772 × 3.937 × 1.417 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Reading the full code: the number gives the 45×100 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. Two symmetric roller rows share the load: C 206 kN, C0 187 kN (C0/C ≈ 0.91), with useful axial capacity in either direction alongside the dominant radial load. With about 4.6 kN of C per millimetre of the 45 mm bore, 22309EMD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Never mount 22309EMD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 100 mm race.",
    "applications": [
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts",
      "stone crusher and screen eccentric shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Vibrating-duty 45 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22309EMD1 is greased for life.",
      "Do not confuse EA and EM at the same number: 22309EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 45×100 mm envelope is identical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 4,600 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 206 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 45 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 206/187 kN ratings, 11.8 kN Pu and 1380 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22309EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22309EMD1?",
        "a": "22309EMD1 is an NTN double-row spherical roller bearing to ISO 15: 45 mm bore, 100 mm OD and 36 mm width (1.772 × 3.937 × 1.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 206 kN, C0 187 kN, Pu 11.8 kN, grease limiting speed 4,600 r/min, oil 5,700 r/min, mass about 1380 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22309EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22309EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22309EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22309EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22309EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22309EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 206 kN C / 187 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22309EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22309EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22309emd1",
      "＊22309emd1",
      "22309EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22309EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22309EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 36,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 206,
    "static_load_kN": 187,
    "fatigue_load_limit_kN": 11.8,
    "limiting_speed_rpm": 4600,
    "max_rpm": 4600,
    "speed_oil_rpm": 5700,
    "weight_g": 1350,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22309EMKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 45 mm bore, 100 mm OD, 36 mm width, rated 4,600 r/min on grease. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 22309EMKD1 is assembled exactly in that order. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Grease/oil ratio: the 4,600 r/min limiting value is .81 of the 5,700 r/min oil value; heavy 36 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 45 mm set.",
    "applications": [
      "pump and fan shafts under heavy belt load",
      "marine propulsion auxiliary shafts",
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "Vibrating-duty 45 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22309EMKD1 is greased for life.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 4,600 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Never substitute 22309EMKD1 by envelope alone: the 187 kN C0 and 11.8 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 206 kN rating no longer applies.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22309EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 206/187 kN ratings, 11.8 kN Pu and 1350 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22309EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22309EMKD1?",
        "a": "22309EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 45 mm bore, 100 mm OD and 36 mm width (1.772 × 3.937 × 1.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 206 kN, C0 187 kN, Pu 11.8 kN, grease limiting speed 4,600 r/min, oil 5,700 r/min, mass about 1350 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22309EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22309EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22309EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22309EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22309EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22309EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 206 kN C / 187 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22309EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22309EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22309emkd1",
      "＊22309emkd1",
      "22309EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22210EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22210EAD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 50,
    "D_mm": 90,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 130,
    "static_load_kN": 124,
    "fatigue_load_limit_kN": 10.1,
    "limiting_speed_rpm": 5700,
    "max_rpm": 5700,
    "speed_oil_rpm": 7200,
    "weight_g": 614,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22210EAD1 identifies a 50×90×23 mm (1.969 × 3.543 × 0.906 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 50 mm bore; the 23 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. At 130 kN C and 614 g mass the 22200 series part is built for shock and vibration; the 23 mm-wide ring needs square abutments to keep both rows equally loaded. The 20.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 23 mm-wide ring seats fully on both sides. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "pump and fan shafts under heavy belt load",
      "marine propulsion auxiliary shafts",
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Vibrating-duty 50 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22210EAD1 is greased for life.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 5,700 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22210EAD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Never substitute 22210EAD1 by envelope alone: the 124 kN C0 and 10.1 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 5,700 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 130/124 kN ratings, 10.1 kN Pu and 614 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22210EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22210EAD1?",
        "a": "22210EAD1 is an NTN double-row spherical roller bearing to ISO 15: 50 mm bore, 90 mm OD and 23 mm width (1.969 × 3.543 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 130 kN, C0 124 kN, Pu 10.1 kN, grease limiting speed 5,700 r/min, oil 7,200 r/min, mass about 614 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22210EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22210EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22210EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22210EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22210EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22210EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 130 kN C / 124 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22210EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22210EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22210ead1",
      "＊22210ead1",
      "22210EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22210EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22210EAKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 50,
    "D_mm": 90,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 130,
    "static_load_kN": 124,
    "fatigue_load_limit_kN": 10.1,
    "limiting_speed_rpm": 5700,
    "max_rpm": 5700,
    "speed_oil_rpm": 7200,
    "weight_g": 602,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 22210EAKD1 denotes the 50 mm bore spherical roller bearing (130 kN C / 124 kN C0) in the 22200 series, the self-aligning choice for heavy combined load. Numbering ties 22210EAKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 50 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Two symmetric roller rows share the load: C 130 kN, C0 124 kN (C0/C ≈ 0.95), with useful axial capacity in either direction alongside the dominant radial load. Grease/oil ratio: the 5,700 r/min limiting value is .79 of the 7,200 r/min oil value; heavy 23 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Mount 22210EAKD1 on its adapter or withdrawal sleeve on the 50 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts",
      "stone crusher and screen eccentric shafts",
      "papermaking and printing press rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Vibrating-duty 50 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22210EAKD1 is greased for life.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22210EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 5,700 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 130 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 50 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 130/124 kN ratings, 10.1 kN Pu and 602 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22210EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22210EAKD1?",
        "a": "22210EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 50 mm bore, 90 mm OD and 23 mm width (1.969 × 3.543 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 130 kN, C0 124 kN, Pu 10.1 kN, grease limiting speed 5,700 r/min, oil 7,200 r/min, mass about 602 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22210EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22210EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22210EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22210EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22210EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22210EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 130 kN C / 124 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22210EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22210EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22210eakd1",
      "＊22210eakd1",
      "22210EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22210EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22210EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 50,
    "D_mm": 90,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 125,
    "static_load_kN": 117,
    "fatigue_load_limit_kN": 9.54,
    "limiting_speed_rpm": 5700,
    "max_rpm": 5700,
    "speed_oil_rpm": 7200,
    "weight_g": 616,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22210EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 50 mm shaft — 125 kN basic dynamic capacity in a 616 g, open ISO 15 envelope. Reading the full code: the number gives the 50×90 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. The cylindrical bore fits a machined 50 mm shaft seat directly; the same envelope in 22210EMKD1 (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. The 20.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 23 mm-wide ring seats fully on both sides. Fit the cylindrical-bore 22210EMD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "pump and fan shafts under heavy belt load",
      "marine propulsion auxiliary shafts",
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Vibrating-duty 50 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22210EMD1 is greased for life.",
      "Do not confuse EA and EM at the same number: 22210EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 50×90 mm envelope is identical.",
      "Never substitute 22210EMD1 by envelope alone: the 117 kN C0 and 9.54 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Do not confuse EA and EM at the same number: 22210EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 50×90 mm envelope is identical.",
      "Do not confuse EA and EM at the same number: 22210EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 50×90 mm envelope is identical.",
      "The 125/117 kN ratings, 9.54 kN Pu and 616 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22210EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22210EMD1?",
        "a": "22210EMD1 is an NTN double-row spherical roller bearing to ISO 15: 50 mm bore, 90 mm OD and 23 mm width (1.969 × 3.543 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 125 kN, C0 117 kN, Pu 9.54 kN, grease limiting speed 5,700 r/min, oil 7,200 r/min, mass about 616 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22210EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22210EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22210EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22210EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22210EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22210EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 125 kN C / 117 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22210EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22210EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22210emd1",
      "＊22210emd1",
      "22210EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22210EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22210EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 50,
    "D_mm": 90,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 125,
    "static_load_kN": 117,
    "fatigue_load_limit_kN": 9.54,
    "limiting_speed_rpm": 5700,
    "max_rpm": 5700,
    "speed_oil_rpm": 7200,
    "weight_g": 604,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22210EMKD1 identifies a 50×90×23 mm (1.969 × 3.543 × 0.906 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 50 mm bore; the 23 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Open by design, 22210EMKD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Grease/oil ratio: the 5,700 r/min limiting value is .79 of the 7,200 r/min oil value; heavy 23 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Mount 22210EMKD1 on its adapter or withdrawal sleeve on the 50 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts",
      "stone crusher and screen eccentric shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "Vibrating-duty 50 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22210EMKD1 is greased for life.",
      "Oil relubrication toward 7,200 r/min needs drain and level design; flooding the 23 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Oil relubrication toward 7,200 r/min needs drain and level design; flooding the 23 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22210EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 125 kN rating no longer applies.",
      "The 125/117 kN ratings, 9.54 kN Pu and 604 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22210EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22210EMKD1?",
        "a": "22210EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 50 mm bore, 90 mm OD and 23 mm width (1.969 × 3.543 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 125 kN, C0 117 kN, Pu 9.54 kN, grease limiting speed 5,700 r/min, oil 7,200 r/min, mass about 604 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22210EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22210EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22210EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22210EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22210EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22210EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 125 kN C / 117 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22210EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22210EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22210emkd1",
      "＊22210emkd1",
      "22210EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21310C",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21310C",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 27,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 131,
    "static_load_kN": 127,
    "fatigue_load_limit_kN": 13.7,
    "limiting_speed_rpm": 4000,
    "max_rpm": 4000,
    "speed_oil_rpm": 5200,
    "weight_g": 1210,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "21310C belongs to the 21300 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. Reading the full code: the number gives the 50×110 mm envelope, C/CK names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and plain outer ring (no D1/W33 groove) completes the order number. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Grease/oil ratio: the 4,000 r/min limiting value is .77 of the 5,200 r/min oil value; heavy 27 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 50 mm set.",
    "applications": [
      "stone crusher and screen eccentric shafts",
      "papermaking and printing press rolls",
      "pump and fan shafts under heavy belt load",
      "marine propulsion auxiliary shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "Vibrating-duty 50 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 21310C is greased for life.",
      "Do not confuse EA and EM at the same number: 21310C carries C design-code; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 50×110 mm envelope is identical.",
      "213-series C/CK executions use the C cage/design code — CK adds the 1:12 tapered bore; quote 21310C in full because a C cannot be mounted on an adapter-sleeve tapered seat.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 21310C in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 21310C on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 131/127 kN ratings, 13.7 kN Pu and 1210 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21310C (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21310C?",
        "a": "21310C is an NTN double-row spherical roller bearing to ISO 15: 50 mm bore, 110 mm OD and 27 mm width (1.969 × 4.331 × 1.063 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 131 kN, C0 127 kN, Pu 13.7 kN, grease limiting speed 4,000 r/min, oil 5,200 r/min, mass about 1210 g. It is open, with pressed-steel cage of the 213-series C design."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "21310C has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 21310CK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21310C is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21310C?",
        "a": "21310C is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21310C take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 131 kN C / 127 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21310CK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 21310CK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21310c",
      "21310C"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21310CK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21310CK",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 27,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 131,
    "static_load_kN": 127,
    "fatigue_load_limit_kN": 13.7,
    "limiting_speed_rpm": 4000,
    "max_rpm": 4000,
    "speed_oil_rpm": 5200,
    "weight_g": 1190,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 50 mm shaft, NTN supplies 21310CK: sphered outer raceway, two roller rows, pressed-steel cage of the 213-series C design, oil speed 5,200 r/min. The leading digits are the ISO 15 dimension series (21300 series); the bore code resolves to 50 mm (two-digit code ×5, with the 00–03 exception table), and 110 mm OD / 27 mm width follow the general plan. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. The 30.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 27 mm-wide ring seats fully on both sides. Never mount 21310CK by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 110 mm race.",
    "applications": [
      "conveyor pulley and elevator drum shafts",
      "stone crusher and screen eccentric shafts",
      "papermaking and printing press rolls",
      "pump and fan shafts under heavy belt load"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Vibrating-duty 50 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 21310CK is greased for life.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 50 mm bearing, and drive-up procedures differ.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 21310CK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 21310CK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 50 mm bearing, and drive-up procedures differ.",
      "The 131/127 kN ratings, 13.7 kN Pu and 1190 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21310CK (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21310CK?",
        "a": "21310CK is an NTN double-row spherical roller bearing to ISO 15: 50 mm bore, 110 mm OD and 27 mm width (1.969 × 4.331 × 1.063 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 131 kN, C0 127 kN, Pu 13.7 kN, grease limiting speed 4,000 r/min, oil 5,200 r/min, mass about 1190 g. It is open, with pressed-steel cage of the 213-series C design and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 21310CK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 21310C."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21310CK is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21310CK?",
        "a": "21310CK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21310CK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 131 kN C / 127 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21310C",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 21310C — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21310ck",
      "21310CK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22310EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22310EAD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 250,
    "static_load_kN": 232,
    "fatigue_load_limit_kN": 14,
    "limiting_speed_rpm": 4300,
    "max_rpm": 4300,
    "speed_oil_rpm": 5300,
    "weight_g": 1820,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 50 mm shaft, NTN supplies 22310EAD1: sphered outer raceway, two roller rows, pressed sheet-steel window cage (EA high-capacity design), oil speed 5,300 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (cylindrical), lubrication feature (D1); 22310EAD1 is assembled exactly in that order. NTN prints two speeds for 22310EAD1: 4,300 r/min grease and 5,300 r/min oil — the gap of 1,000 r/min reflects oil cooling of the heavy roller set. Speed planning: 4,300 r/min grease limiting speed is the cage/kinematic ceiling and 5,300 r/min is the oil-lubricated value for the 50 mm bore; vibrating screens rarely approach either and are load/cage limited instead. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22310EAD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "pump and fan shafts under heavy belt load",
      "marine propulsion auxiliary shafts",
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Vibrating-duty 50 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22310EAD1 is greased for life.",
      "Do not confuse EA and EM at the same number: 22310EAD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 50×110 mm envelope is identical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 4,300 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 4,300 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Oil relubrication toward 5,300 r/min needs drain and level design; flooding the 40 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 250/232 kN ratings, 14 kN Pu and 1820 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22310EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22310EAD1?",
        "a": "22310EAD1 is an NTN double-row spherical roller bearing to ISO 15: 50 mm bore, 110 mm OD and 40 mm width (1.969 × 4.331 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 250 kN, C0 232 kN, Pu 14 kN, grease limiting speed 4,300 r/min, oil 5,300 r/min, mass about 1820 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22310EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22310EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22310EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22310EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22310EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22310EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 250 kN C / 232 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22310EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22310EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22310ead1",
      "＊22310ead1",
      "22310EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22310EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22310EAKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 250,
    "static_load_kN": 232,
    "fatigue_load_limit_kN": 14,
    "limiting_speed_rpm": 4300,
    "max_rpm": 4300,
    "speed_oil_rpm": 5300,
    "weight_g": 1790,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22310EAKD1 is the EA pressed-steel-cage execution of NTN's spherical roller range for a 50 mm shaft — 250 kN basic dynamic capacity in a 1790 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 50 mm bore; the 40 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. NTN prints two speeds for 22310EAKD1: 4,300 r/min grease and 5,300 r/min oil — the gap of 1,000 r/min reflects oil cooling of the heavy roller set. Grease/oil ratio: the 4,300 r/min limiting value is .81 of the 5,300 r/min oil value; heavy 40 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22310EAKD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "conveyor pulley and elevator drum shafts",
      "stone crusher and screen eccentric shafts",
      "papermaking and printing press rolls",
      "pump and fan shafts under heavy belt load"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "Vibrating-duty 50 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22310EAKD1 is greased for life.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 50 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 50 mm bearing, and drive-up procedures differ.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22310EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Oil relubrication toward 5,300 r/min needs drain and level design; flooding the 40 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 250/232 kN ratings, 14 kN Pu and 1790 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22310EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22310EAKD1?",
        "a": "22310EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 50 mm bore, 110 mm OD and 40 mm width (1.969 × 4.331 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 250 kN, C0 232 kN, Pu 14 kN, grease limiting speed 4,300 r/min, oil 5,300 r/min, mass about 1790 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22310EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22310EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22310EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22310EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22310EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22310EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 250 kN C / 232 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22310EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22310EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22310eakd1",
      "＊22310eakd1",
      "22310EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22310EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22310EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 250,
    "static_load_kN": 232,
    "fatigue_load_limit_kN": 14,
    "limiting_speed_rpm": 4300,
    "max_rpm": 4300,
    "speed_oil_rpm": 5300,
    "weight_g": 1840,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22310EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 50 mm bore, 110 mm OD, 40 mm width, rated 4,300 r/min on grease. Numbering ties 22310EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 50 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. Speed planning: 4,300 r/min grease limiting speed is the cage/kinematic ceiling and 5,300 r/min is the oil-lubricated value for the 50 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 50 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "pump and fan shafts under heavy belt load",
      "marine propulsion auxiliary shafts",
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Vibrating-duty 50 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22310EMD1 is greased for life.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 40 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22310EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 50 mm bearing, and drive-up procedures differ.",
      "Never substitute 22310EMD1 by envelope alone: the 232 kN C0 and 14 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 250/232 kN ratings, 14 kN Pu and 1840 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22310EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22310EMD1?",
        "a": "22310EMD1 is an NTN double-row spherical roller bearing to ISO 15: 50 mm bore, 110 mm OD and 40 mm width (1.969 × 4.331 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 250 kN, C0 232 kN, Pu 14 kN, grease limiting speed 4,300 r/min, oil 5,300 r/min, mass about 1840 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22310EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22310EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22310EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22310EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22310EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22310EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 250 kN C / 232 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22310EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22310EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22310emd1",
      "＊22310emd1",
      "22310EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22310EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22310EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 250,
    "static_load_kN": 232,
    "fatigue_load_limit_kN": 14,
    "limiting_speed_rpm": 4300,
    "max_rpm": 4300,
    "speed_oil_rpm": 5300,
    "weight_g": 1800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22310EMKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 50×110×40 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 22310EMKD1 is assembled exactly in that order. The 30.0 mm radial section over the 50 mm bore carries two roller rows; capacity per millimetre of bore is about 5.0 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. 50 mm bore is 1.969 in and 110 mm OD is 4.331 in; the ISO 15 envelope swaps between brands, but the 250/232 kN ratings and cage design are NTN 2203E values. Fillet radii on shaft and housing must clear the ring chamfers of the 40 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts",
      "stone crusher and screen eccentric shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "Vibrating-duty 50 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22310EMKD1 is greased for life.",
      "Never substitute 22310EMKD1 by envelope alone: the 232 kN C0 and 14 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 4,300 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22310EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22310EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 250/232 kN ratings, 14 kN Pu and 1800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22310EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22310EMKD1?",
        "a": "22310EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 50 mm bore, 110 mm OD and 40 mm width (1.969 × 4.331 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 250 kN, C0 232 kN, Pu 14 kN, grease limiting speed 4,300 r/min, oil 5,300 r/min, mass about 1800 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22310EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22310EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22310EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22310EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22310EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22310EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 250 kN C / 232 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22310EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22310EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22310emkd1",
      "＊22310emkd1",
      "22310EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22211EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22211EAD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 55,
    "D_mm": 100,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 155,
    "static_load_kN": 148,
    "fatigue_load_limit_kN": 12.6,
    "limiting_speed_rpm": 5300,
    "max_rpm": 5300,
    "speed_oil_rpm": 6700,
    "weight_g": 830,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 55 mm shaft, NTN supplies 22211EAD1: sphered outer raceway, two roller rows, pressed sheet-steel window cage (EA high-capacity design), oil speed 6,700 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (cylindrical), lubrication feature (D1); 22211EAD1 is assembled exactly in that order. Two symmetric roller rows share the load: C 155 kN, C0 148 kN (C0/C ≈ 0.95), with useful axial capacity in either direction alongside the dominant radial load. Selection: the C0/C ratio of 0.95 (148/155 kN) reflects the heavy static and shock proportioning of 22211EAD1; size the equivalent load at the required L10 with shock factor for the application. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22211EAD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts",
      "stone crusher and screen eccentric shafts",
      "papermaking and printing press rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "Vibrating-duty 55 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22211EAD1 is greased for life.",
      "Never substitute 22211EAD1 by envelope alone: the 148 kN C0 and 12.6 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 25 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 55 mm bearing, and drive-up procedures differ.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 55 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 155/148 kN ratings, 12.6 kN Pu and 830 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22211EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22211EAD1?",
        "a": "22211EAD1 is an NTN double-row spherical roller bearing to ISO 15: 55 mm bore, 100 mm OD and 25 mm width (2.165 × 3.937 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 155 kN, C0 148 kN, Pu 12.6 kN, grease limiting speed 5,300 r/min, oil 6,700 r/min, mass about 830 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22211EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22211EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22211EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22211EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22211EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22211EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 155 kN C / 148 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22211EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22211EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22211ead1",
      "＊22211ead1",
      "22211EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22211EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22211EAKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 55,
    "D_mm": 100,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 155,
    "static_load_kN": 148,
    "fatigue_load_limit_kN": 12.6,
    "limiting_speed_rpm": 5300,
    "max_rpm": 5300,
    "speed_oil_rpm": 6700,
    "weight_g": 814,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 22211EAKD1 denotes the 55 mm bore spherical roller bearing (155 kN C / 148 kN C0) in the 22200 series, the self-aligning choice for heavy combined load. Reading the full code: the number gives the 55×100 mm envelope, EA names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. The 1:12 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 55 mm bore assembly. Equivalent-load planning keeps a radial plus moderate axial combination on 22211EAKD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Fillet radii on shaft and housing must clear the ring chamfers of the 25 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "pump and fan shafts under heavy belt load",
      "marine propulsion auxiliary shafts",
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "Vibrating-duty 55 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22211EAKD1 is greased for life.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 55 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 25 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22211EAKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Do not confuse EA and EM at the same number: 22211EAKD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 55×100 mm envelope is identical.",
      "The 155/148 kN ratings, 12.6 kN Pu and 814 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22211EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22211EAKD1?",
        "a": "22211EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 55 mm bore, 100 mm OD and 25 mm width (2.165 × 3.937 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 155 kN, C0 148 kN, Pu 12.6 kN, grease limiting speed 5,300 r/min, oil 6,700 r/min, mass about 814 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22211EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22211EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22211EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22211EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22211EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22211EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 155 kN C / 148 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22211EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22211EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22211eakd1",
      "＊22211eakd1",
      "22211EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22211EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22211EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 55,
    "D_mm": 100,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 148,
    "static_load_kN": 140,
    "fatigue_load_limit_kN": 11.9,
    "limiting_speed_rpm": 5300,
    "max_rpm": 5300,
    "speed_oil_rpm": 6700,
    "weight_g": 827,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22211EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 55 mm bore, 100 mm OD, 25 mm width, rated 5,300 r/min on grease. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 22211EMD1 is assembled exactly in that order. Open by design, 22211EMD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Equivalent-load planning keeps a radial plus moderate axial combination on 22211EMD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 55 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts",
      "stone crusher and screen eccentric shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "Vibrating-duty 55 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22211EMD1 is greased for life.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 5,300 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 148 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 55 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 148 kN rating no longer applies.",
      "The 148/140 kN ratings, 11.9 kN Pu and 827 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22211EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22211EMD1?",
        "a": "22211EMD1 is an NTN double-row spherical roller bearing to ISO 15: 55 mm bore, 100 mm OD and 25 mm width (2.165 × 3.937 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 148 kN, C0 140 kN, Pu 11.9 kN, grease limiting speed 5,300 r/min, oil 6,700 r/min, mass about 827 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22211EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22211EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22211EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22211EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22211EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22211EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 148 kN C / 140 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22211EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22211EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22211emd1",
      "＊22211emd1",
      "22211EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22211EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22211EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 55,
    "D_mm": 100,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 148,
    "static_load_kN": 140,
    "fatigue_load_limit_kN": 11.9,
    "limiting_speed_rpm": 5300,
    "max_rpm": 5300,
    "speed_oil_rpm": 6700,
    "weight_g": 811,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22211EMKD1 identifies a 55×100×25 mm (2.165 × 3.937 × 0.984 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Numbering ties 22211EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 55 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Grease/oil ratio: the 5,300 r/min limiting value is .79 of the 6,700 r/min oil value; heavy 25 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 55 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "stone crusher and screen eccentric shafts",
      "papermaking and printing press rolls",
      "pump and fan shafts under heavy belt load",
      "marine propulsion auxiliary shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Vibrating-duty 55 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22211EMKD1 is greased for life.",
      "Never substitute 22211EMKD1 by envelope alone: the 140 kN C0 and 11.9 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22211EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 55 mm bearing, and drive-up procedures differ.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 55 mm bearing, and drive-up procedures differ.",
      "The 148/140 kN ratings, 11.9 kN Pu and 811 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22211EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22211EMKD1?",
        "a": "22211EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 55 mm bore, 100 mm OD and 25 mm width (2.165 × 3.937 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 148 kN, C0 140 kN, Pu 11.9 kN, grease limiting speed 5,300 r/min, oil 6,700 r/min, mass about 811 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22211EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22211EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22211EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22211EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22211EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22211EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 148 kN C / 140 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22211EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22211EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22211emkd1",
      "＊22211emkd1",
      "22211EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21311-NTN",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21311",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 29,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 161,
    "static_load_kN": 163,
    "fatigue_load_limit_kN": 16.1,
    "limiting_speed_rpm": 3700,
    "max_rpm": 3700,
    "speed_oil_rpm": 4800,
    "weight_g": 1710,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 55 mm shaft, NTN supplies 21311: sphered outer raceway, two roller rows, pressed-steel cage of the 213-series C design, oil speed 4,800 r/min. Numbering ties 21311 to its envelope and execution: same-number EA versus EM or plain variants share the 55 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the C design-code cage. The 32.5 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 29 mm-wide ring seats fully on both sides. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 21311 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "pump and fan shafts under heavy belt load",
      "marine propulsion auxiliary shafts",
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Vibrating-duty 55 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 21311 is greased for life.",
      "Do not confuse EA and EM at the same number: 21311 carries C design-code; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 55×120 mm envelope is identical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 29 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 21311 by envelope alone: the 163 kN C0 and 16.1 kN Pu are specific to the NTN C design-code execution, and vibrating duty depends heavily on cage identity.",
      "Never substitute 21311 by envelope alone: the 163 kN C0 and 16.1 kN Pu are specific to the NTN C design-code execution, and vibrating duty depends heavily on cage identity.",
      "The 161/163 kN ratings, 16.1 kN Pu and 1710 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21311 (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21311?",
        "a": "21311 is an NTN double-row spherical roller bearing to ISO 15: 55 mm bore, 120 mm OD and 29 mm width (2.165 × 4.724 × 1.142 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 161 kN, C0 163 kN, Pu 16.1 kN, grease limiting speed 3,700 r/min, oil 4,800 r/min, mass about 1710 g. It is open, with pressed-steel cage of the 213-series C design."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "21311 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 21311K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21311 is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21311?",
        "a": "21311 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21311 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 161 kN C / 163 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21311",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "21311-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "21311K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 21311K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21311",
      "21311-NTN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21311K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21311K",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 29,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 161,
    "static_load_kN": 163,
    "fatigue_load_limit_kN": 16.1,
    "limiting_speed_rpm": 3700,
    "max_rpm": 3700,
    "speed_oil_rpm": 4800,
    "weight_g": 1690,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "21311K is the C design-code execution of NTN's spherical roller range for a 55 mm shaft — 161 kN basic dynamic capacity in a 1690 g, open ISO 15 envelope. Reading the full code: the number gives the 55×120 mm envelope, C/CK names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. The 1:12 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 55 mm bore assembly. Selection: the C0/C ratio of 1.01 (163/161 kN) reflects the heavy static and shock proportioning of 21311K; size the equivalent load at the required L10 with shock factor for the application. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 55 mm set.",
    "applications": [
      "marine propulsion auxiliary shafts",
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "Vibrating-duty 55 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 21311K is greased for life.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 21311K in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 3,700 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Oil relubrication toward 4,800 r/min needs drain and level design; flooding the 29 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Do not confuse EA and EM at the same number: 21311K carries C design-code; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 55×120 mm envelope is identical.",
      "The 161/163 kN ratings, 16.1 kN Pu and 1690 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21311K (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21311K?",
        "a": "21311K is an NTN double-row spherical roller bearing to ISO 15: 55 mm bore, 120 mm OD and 29 mm width (2.165 × 4.724 × 1.142 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 161 kN, C0 163 kN, Pu 16.1 kN, grease limiting speed 3,700 r/min, oil 4,800 r/min, mass about 1690 g. It is open, with pressed-steel cage of the 213-series C design and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 21311K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 21311."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21311K is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21311K?",
        "a": "21311K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21311K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 161 kN C / 163 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21311-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 21311-NTN — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21311k",
      "21311K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22311EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22311EAD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 43,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 296,
    "static_load_kN": 274,
    "fatigue_load_limit_kN": 17.4,
    "limiting_speed_rpm": 3900,
    "max_rpm": 3900,
    "speed_oil_rpm": 4800,
    "weight_g": 2310,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22311EAD1 identifies a 55×120×43 mm (2.165 × 4.724 × 1.693 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. The leading digits are the ISO 15 dimension series (22300 series); the bore code resolves to 55 mm (two-digit code ×5, with the 00–03 exception table), and 120 mm OD / 43 mm width follow the general plan. At 296 kN C and 2310 g mass the 22300 series part is built for shock and vibration; the 43 mm-wide ring needs square abutments to keep both rows equally loaded. Pu 17.4 kN against C0 274 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22311EAD1 moves with cleanliness far more than with small C variations. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22311EAD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts",
      "stone crusher and screen eccentric shafts",
      "papermaking and printing press rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Vibrating-duty 55 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22311EAD1 is greased for life.",
      "The cylindrical-bore 22311EAD1 and its tapered-bore counterpart 22311EAKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 55 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22311EAD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 3,900 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 296/274 kN ratings, 17.4 kN Pu and 2310 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22311EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22311EAD1?",
        "a": "22311EAD1 is an NTN double-row spherical roller bearing to ISO 15: 55 mm bore, 120 mm OD and 43 mm width (2.165 × 4.724 × 1.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 296 kN, C0 274 kN, Pu 17.4 kN, grease limiting speed 3,900 r/min, oil 4,800 r/min, mass about 2310 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22311EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22311EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22311EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22311EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22311EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22311EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 296 kN C / 274 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22311EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22311EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22311ead1",
      "＊22311ead1",
      "22311EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22311EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22311EAKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 43,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 296,
    "static_load_kN": 274,
    "fatigue_load_limit_kN": 17.4,
    "limiting_speed_rpm": 3900,
    "max_rpm": 3900,
    "speed_oil_rpm": 4800,
    "weight_g": 2260,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22311EAKD1 is the EA pressed-steel-cage execution of NTN's spherical roller range for a 55 mm shaft — 296 kN basic dynamic capacity in a 2260 g, open ISO 15 envelope. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (K), lubrication feature (D1); 22311EAKD1 is assembled exactly in that order. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. With about 5.4 kN of C per millimetre of the 55 mm bore, 22311EAKD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Never mount 22311EAKD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 120 mm race.",
    "applications": [
      "papermaking and printing press rolls",
      "pump and fan shafts under heavy belt load",
      "marine propulsion auxiliary shafts",
      "vibrating screen and feeder shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Vibrating-duty 55 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22311EAKD1 is greased for life.",
      "Oil relubrication toward 4,800 r/min needs drain and level design; flooding the 43 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22311EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22311EAKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22311EAKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 296/274 kN ratings, 17.4 kN Pu and 2260 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22311EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22311EAKD1?",
        "a": "22311EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 55 mm bore, 120 mm OD and 43 mm width (2.165 × 4.724 × 1.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 296 kN, C0 274 kN, Pu 17.4 kN, grease limiting speed 3,900 r/min, oil 4,800 r/min, mass about 2260 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22311EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22311EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22311EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22311EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22311EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22311EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 296 kN C / 274 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22311EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22311EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22311eakd1",
      "＊22311eakd1",
      "22311EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22311EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22311EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 43,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 296,
    "static_load_kN": 274,
    "fatigue_load_limit_kN": 17.4,
    "limiting_speed_rpm": 3900,
    "max_rpm": 3900,
    "speed_oil_rpm": 4800,
    "weight_g": 2340,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22311EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 55 mm shaft — 296 kN basic dynamic capacity in a 2340 g, open ISO 15 envelope. The leading digits are the ISO 15 dimension series (22300 series); the bore code resolves to 55 mm (two-digit code ×5, with the 00–03 exception table), and 120 mm OD / 43 mm width follow the general plan. The cylindrical bore fits a machined 55 mm shaft seat directly; the same envelope in 22311EMKD1 (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Selection: the C0/C ratio of 0.93 (274/296 kN) reflects the heavy static and shock proportioning of 22311EMD1; size the equivalent load at the required L10 with shock factor for the application. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 55 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts",
      "stone crusher and screen eccentric shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "Vibrating-duty 55 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22311EMD1 is greased for life.",
      "Do not confuse EA and EM at the same number: 22311EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 55×120 mm envelope is identical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 3,900 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Oil relubrication toward 4,800 r/min needs drain and level design; flooding the 43 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Do not confuse EA and EM at the same number: 22311EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 55×120 mm envelope is identical.",
      "The 296/274 kN ratings, 17.4 kN Pu and 2340 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22311EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22311EMD1?",
        "a": "22311EMD1 is an NTN double-row spherical roller bearing to ISO 15: 55 mm bore, 120 mm OD and 43 mm width (2.165 × 4.724 × 1.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 296 kN, C0 274 kN, Pu 17.4 kN, grease limiting speed 3,900 r/min, oil 4,800 r/min, mass about 2340 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22311EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22311EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22311EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22311EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22311EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22311EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 296 kN C / 274 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22311EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22311EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22311emd1",
      "＊22311emd1",
      "22311EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22311EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22311EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 43,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 296,
    "static_load_kN": 274,
    "fatigue_load_limit_kN": 17.4,
    "limiting_speed_rpm": 3900,
    "max_rpm": 3900,
    "speed_oil_rpm": 4800,
    "weight_g": 2290,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22311EMKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 55×120×43 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). The leading digits are the ISO 15 dimension series (22300 series); the bore code resolves to 55 mm (two-digit code ×5, with the 00–03 exception table), and 120 mm OD / 43 mm width follow the general plan. Two symmetric roller rows share the load: C 296 kN, C0 274 kN (C0/C ≈ 0.93), with useful axial capacity in either direction alongside the dominant radial load. Catalogue mass 2290 g (2.29 kg) for the 55×120×43 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Mount 22311EMKD1 on its adapter or withdrawal sleeve on the 55 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "conveyor pulley and elevator drum shafts",
      "stone crusher and screen eccentric shafts",
      "papermaking and printing press rolls",
      "pump and fan shafts under heavy belt load"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Vibrating-duty 55 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22311EMKD1 is greased for life.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 3,900 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 43 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 55 mm bearing, and drive-up procedures differ.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 55 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 296/274 kN ratings, 17.4 kN Pu and 2290 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22311EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22311EMKD1?",
        "a": "22311EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 55 mm bore, 120 mm OD and 43 mm width (2.165 × 4.724 × 1.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 296 kN, C0 274 kN, Pu 17.4 kN, grease limiting speed 3,900 r/min, oil 4,800 r/min, mass about 2290 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22311EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22311EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22311EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22311EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22311EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22311EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 296 kN C / 274 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22311EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22311EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22311emkd1",
      "＊22311emkd1",
      "22311EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22212EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22212EAD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 60,
    "D_mm": 110,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 187,
    "static_load_kN": 181,
    "fatigue_load_limit_kN": 15.4,
    "limiting_speed_rpm": 4800,
    "max_rpm": 4800,
    "speed_oil_rpm": 6000,
    "weight_g": 1140,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22212EAD1 identifies a 60×110×28 mm (2.362 × 4.331 × 1.102 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Numbering ties 22212EAD1 to its envelope and execution: same-number EA versus EM or plain variants share the 60 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EA pressed-steel-cage cage. The 25.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 28 mm-wide ring seats fully on both sides. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22212EAD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Mount the 60 mm ring with induction heat or the sleeve drive-up procedure; at 1140 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Oil relubrication toward 6,000 r/min needs drain and level design; flooding the 28 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Oil relubrication toward 6,000 r/min needs drain and level design; flooding the 28 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Oil relubrication toward 6,000 r/min needs drain and level design; flooding the 28 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Never substitute 22212EAD1 by envelope alone: the 181 kN C0 and 15.4 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 187/181 kN ratings, 15.4 kN Pu and 1140 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22212EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22212EAD1?",
        "a": "22212EAD1 is an NTN double-row spherical roller bearing to ISO 15: 60 mm bore, 110 mm OD and 28 mm width (2.362 × 4.331 × 1.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 187 kN, C0 181 kN, Pu 15.4 kN, grease limiting speed 4,800 r/min, oil 6,000 r/min, mass about 1140 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22212EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22212EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22212EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22212EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22212EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22212EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 187 kN C / 181 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22212EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22212EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22212ead1",
      "＊22212ead1",
      "22212EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22212EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22212EAKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 60,
    "D_mm": 110,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 187,
    "static_load_kN": 181,
    "fatigue_load_limit_kN": 15.4,
    "limiting_speed_rpm": 4800,
    "max_rpm": 4800,
    "speed_oil_rpm": 6000,
    "weight_g": 1120,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 22212EAKD1 denotes the 60 mm bore spherical roller bearing (187 kN C / 181 kN C0) in the 22200 series, the self-aligning choice for heavy combined load. Numbering ties 22212EAKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 60 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. NTN prints two speeds for 22212EAKD1: 4,800 r/min grease and 6,000 r/min oil — the gap of 1,200 r/min reflects oil cooling of the heavy roller set. 60 mm bore is 2.362 in and 110 mm OD is 4.331 in; the ISO 15 envelope swaps between brands, but the 187/181 kN ratings and cage design are NTN 2203E values. Mount 22212EAKD1 on its adapter or withdrawal sleeve on the 60 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Mount the 60 mm ring with induction heat or the sleeve drive-up procedure; at 1120 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Oil relubrication toward 6,000 r/min needs drain and level design; flooding the 28 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22212EAKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 60 mm bearing, and drive-up procedures differ.",
      "Oil relubrication toward 6,000 r/min needs drain and level design; flooding the 28 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 187/181 kN ratings, 15.4 kN Pu and 1120 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22212EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22212EAKD1?",
        "a": "22212EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 60 mm bore, 110 mm OD and 28 mm width (2.362 × 4.331 × 1.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 187 kN, C0 181 kN, Pu 15.4 kN, grease limiting speed 4,800 r/min, oil 6,000 r/min, mass about 1120 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22212EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22212EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22212EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22212EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22212EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22212EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 187 kN C / 181 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22212EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22212EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22212eakd1",
      "＊22212eakd1",
      "22212EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22212EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22212EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 60,
    "D_mm": 110,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 179,
    "static_load_kN": 171,
    "fatigue_load_limit_kN": 14.6,
    "limiting_speed_rpm": 4800,
    "max_rpm": 4800,
    "speed_oil_rpm": 6000,
    "weight_g": 1150,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22212EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 60 mm shaft — 179 kN basic dynamic capacity in a 1150 g, open ISO 15 envelope. Numbering ties 22212EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 60 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The 25.0 mm radial section over the 60 mm bore carries two roller rows; capacity per millimetre of bore is about 3.0 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Grease/oil ratio: the 4,800 r/min limiting value is .80 of the 6,000 r/min oil value; heavy 28 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 60 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Mount the 60 mm ring with induction heat or the sleeve drive-up procedure; at 1150 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The cylindrical-bore 22212EMD1 and its tapered-bore counterpart 22212EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 28 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 4,800 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The cylindrical-bore 22212EMD1 and its tapered-bore counterpart 22212EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 179/171 kN ratings, 14.6 kN Pu and 1150 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22212EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22212EMD1?",
        "a": "22212EMD1 is an NTN double-row spherical roller bearing to ISO 15: 60 mm bore, 110 mm OD and 28 mm width (2.362 × 4.331 × 1.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 179 kN, C0 171 kN, Pu 14.6 kN, grease limiting speed 4,800 r/min, oil 6,000 r/min, mass about 1150 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22212EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22212EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22212EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22212EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22212EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22212EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 179 kN C / 171 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22212EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22212EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22212emd1",
      "＊22212emd1",
      "22212EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22212EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22212EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 60,
    "D_mm": 110,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 179,
    "static_load_kN": 171,
    "fatigue_load_limit_kN": 14.6,
    "limiting_speed_rpm": 4800,
    "max_rpm": 4800,
    "speed_oil_rpm": 6000,
    "weight_g": 1130,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22212EMKD1 identifies a 60×110×28 mm (2.362 × 4.331 × 1.102 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 60 mm bore; the 28 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The 25.0 mm radial section over the 60 mm bore carries two roller rows; capacity per millimetre of bore is about 3.0 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. With about 3.0 kN of C per millimetre of the 60 mm bore, 22212EMKD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 60 mm set.",
    "applications": [
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Mount the 60 mm ring with induction heat or the sleeve drive-up procedure; at 1130 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 4,800 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Do not confuse EA and EM at the same number: 22212EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 60×110 mm envelope is identical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 28 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22212EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 179/171 kN ratings, 14.6 kN Pu and 1130 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22212EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22212EMKD1?",
        "a": "22212EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 60 mm bore, 110 mm OD and 28 mm width (2.362 × 4.331 × 1.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 179 kN, C0 171 kN, Pu 14.6 kN, grease limiting speed 4,800 r/min, oil 6,000 r/min, mass about 1130 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22212EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22212EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22212EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22212EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22212EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22212EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 179 kN C / 171 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22212EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22212EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22212emkd1",
      "＊22212emkd1",
      "22212EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21312-NTN",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21312",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 60,
    "D_mm": 130,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 186,
    "static_load_kN": 191,
    "fatigue_load_limit_kN": 28.2,
    "limiting_speed_rpm": 3400,
    "max_rpm": 3400,
    "speed_oil_rpm": 4400,
    "weight_g": 2100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "21312 is the C design-code execution of NTN's spherical roller range for a 60 mm shaft — 186 kN basic dynamic capacity in a 2100 g, open ISO 15 envelope. The leading digits are the ISO 15 dimension series (21300 series); the bore code resolves to 60 mm (two-digit code ×5, with the 00–03 exception table), and 130 mm OD / 31 mm width follow the general plan. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Equivalent-load planning keeps a radial plus moderate axial combination on 21312; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Never mount 21312 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 130 mm race.",
    "applications": [
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "Mount the 60 mm ring with induction heat or the sleeve drive-up procedure; at 2100 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 3,400 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 3,400 r/min grease rating is lost to abrasive wear long before fatigue.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 60 mm bearing, and drive-up procedures differ.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 21312 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 186/191 kN ratings, 28.2 kN Pu and 2100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21312 (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21312?",
        "a": "21312 is an NTN double-row spherical roller bearing to ISO 15: 60 mm bore, 130 mm OD and 31 mm width (2.362 × 5.118 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 186 kN, C0 191 kN, Pu 28.2 kN, grease limiting speed 3,400 r/min, oil 4,400 r/min, mass about 2100 g. It is open, with pressed-steel cage of the 213-series C design."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "21312 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 21312K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21312 is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21312?",
        "a": "21312 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21312 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 186 kN C / 191 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21312",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "21312-EK",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "21312K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 21312K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21312",
      "21312-NTN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21312K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21312K",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 60,
    "D_mm": 130,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 186,
    "static_load_kN": 191,
    "fatigue_load_limit_kN": 28.2,
    "limiting_speed_rpm": 3400,
    "max_rpm": 3400,
    "speed_oil_rpm": 4400,
    "weight_g": 2070,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "21312K belongs to the 21300 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. On the NTN nameplate the suffix cluster after the size reads in order: cage design (C/CK), bore (K), lubrication feature (none); 21312K is assembled exactly in that order. Open by design, 21312K requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Speed planning: 3,400 r/min grease limiting speed is the cage/kinematic ceiling and 4,400 r/min is the oil-lubricated value for the 60 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Never mount 21312K by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 130 mm race.",
    "applications": [
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Mount the 60 mm ring with induction heat or the sleeve drive-up procedure; at 2070 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "213-series C/CK executions use the C cage/design code — CK adds the 1:12 tapered bore; quote 21312K in full because a C cannot be mounted on an adapter-sleeve tapered seat.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 186 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 60 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 186 kN rating no longer applies.",
      "The 186/191 kN ratings, 28.2 kN Pu and 2070 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21312K (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21312K?",
        "a": "21312K is an NTN double-row spherical roller bearing to ISO 15: 60 mm bore, 130 mm OD and 31 mm width (2.362 × 5.118 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 186 kN, C0 191 kN, Pu 28.2 kN, grease limiting speed 3,400 r/min, oil 4,400 r/min, mass about 2070 g. It is open, with pressed-steel cage of the 213-series C design and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 21312K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 21312."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21312K is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21312K?",
        "a": "21312K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21312K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 186 kN C / 191 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21312-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 21312-NTN — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21312k",
      "21312K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22312EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22312EAD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 60,
    "D_mm": 130,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 340,
    "static_load_kN": 319,
    "fatigue_load_limit_kN": 20.3,
    "limiting_speed_rpm": 3600,
    "max_rpm": 3600,
    "speed_oil_rpm": 4600,
    "weight_g": 2860,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 60 mm shaft, NTN supplies 22312EAD1: sphered outer raceway, two roller rows, pressed sheet-steel window cage (EA high-capacity design), oil speed 4,600 r/min. Digit by digit the code reads as spherical-roller dimension series plus 60 mm bore; the 46 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Two symmetric roller rows share the load: C 340 kN, C0 319 kN (C0/C ≈ 0.94), with useful axial capacity in either direction alongside the dominant radial load. Speed planning: 3,600 r/min grease limiting speed is the cage/kinematic ceiling and 4,600 r/min is the oil-lubricated value for the 60 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Never mount 22312EAD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 130 mm race.",
    "applications": [
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Mount the 60 mm ring with induction heat or the sleeve drive-up procedure; at 2860 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Never substitute 22312EAD1 by envelope alone: the 319 kN C0 and 20.3 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22312EAD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The cylindrical-bore 22312EAD1 and its tapered-bore counterpart 22312EAKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 60 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 340/319 kN ratings, 20.3 kN Pu and 2860 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22312EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22312EAD1?",
        "a": "22312EAD1 is an NTN double-row spherical roller bearing to ISO 15: 60 mm bore, 130 mm OD and 46 mm width (2.362 × 5.118 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 340 kN, C0 319 kN, Pu 20.3 kN, grease limiting speed 3,600 r/min, oil 4,600 r/min, mass about 2860 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22312EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22312EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22312EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22312EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22312EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22312EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 340 kN C / 319 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22312EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22312EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22312ead1",
      "＊22312ead1",
      "22312EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22312EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22312EAKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 60,
    "D_mm": 130,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 340,
    "static_load_kN": 319,
    "fatigue_load_limit_kN": 20.3,
    "limiting_speed_rpm": 3600,
    "max_rpm": 3600,
    "speed_oil_rpm": 4600,
    "weight_g": 2800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22312EAKD1 is the EA pressed-steel-cage execution of NTN's spherical roller range for a 60 mm shaft — 340 kN basic dynamic capacity in a 2800 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 60 mm bore; the 46 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. At 340 kN C and 2800 g mass the 22300 series part is built for shock and vibration; the 46 mm-wide ring needs square abutments to keep both rows equally loaded. With about 5.7 kN of C per millimetre of the 60 mm bore, 22312EAKD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Fillet radii on shaft and housing must clear the ring chamfers of the 46 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Mount the 60 mm ring with induction heat or the sleeve drive-up procedure; at 2800 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Never substitute 22312EAKD1 by envelope alone: the 319 kN C0 and 20.3 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 340 kN rating no longer applies.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 60 mm bearing, and drive-up procedures differ.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 3,600 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 340/319 kN ratings, 20.3 kN Pu and 2800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22312EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22312EAKD1?",
        "a": "22312EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 60 mm bore, 130 mm OD and 46 mm width (2.362 × 5.118 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 340 kN, C0 319 kN, Pu 20.3 kN, grease limiting speed 3,600 r/min, oil 4,600 r/min, mass about 2800 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22312EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22312EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22312EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22312EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22312EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22312EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 340 kN C / 319 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22312EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22312EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22312eakd1",
      "＊22312eakd1",
      "22312EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22312EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22312EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 60,
    "D_mm": 130,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 340,
    "static_load_kN": 319,
    "fatigue_load_limit_kN": 20.3,
    "limiting_speed_rpm": 3600,
    "max_rpm": 3600,
    "speed_oil_rpm": 4600,
    "weight_g": 2910,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 60 mm shaft, NTN supplies 22312EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 4,600 r/min. Digit by digit the code reads as spherical-roller dimension series plus 60 mm bore; the 46 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. The 35.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 46 mm-wide ring seats fully on both sides. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 60 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Mount the 60 mm ring with induction heat or the sleeve drive-up procedure; at 2910 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 3,600 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 60 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 46 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22312EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 340/319 kN ratings, 20.3 kN Pu and 2910 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22312EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22312EMD1?",
        "a": "22312EMD1 is an NTN double-row spherical roller bearing to ISO 15: 60 mm bore, 130 mm OD and 46 mm width (2.362 × 5.118 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 340 kN, C0 319 kN, Pu 20.3 kN, grease limiting speed 3,600 r/min, oil 4,600 r/min, mass about 2910 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22312EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22312EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22312EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22312EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22312EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22312EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 340 kN C / 319 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22312EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22312EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22312emd1",
      "＊22312emd1",
      "22312EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22312EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22312EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 60,
    "D_mm": 130,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 340,
    "static_load_kN": 319,
    "fatigue_load_limit_kN": 20.3,
    "limiting_speed_rpm": 3600,
    "max_rpm": 3600,
    "speed_oil_rpm": 4600,
    "weight_g": 2850,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22312EMKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 60×130×46 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 22312EMKD1 is assembled exactly in that order. The 1:12 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 60 mm bore assembly. With about 5.7 kN of C per millimetre of the 60 mm bore, 22312EMKD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Fillet radii on shaft and housing must clear the ring chamfers of the 46 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "Mount the 60 mm ring with induction heat or the sleeve drive-up procedure; at 2850 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Do not confuse EA and EM at the same number: 22312EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 60×130 mm envelope is identical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22312EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 3,600 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Do not confuse EA and EM at the same number: 22312EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 60×130 mm envelope is identical.",
      "The 340/319 kN ratings, 20.3 kN Pu and 2850 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22312EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22312EMKD1?",
        "a": "22312EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 60 mm bore, 130 mm OD and 46 mm width (2.362 × 5.118 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 340 kN, C0 319 kN, Pu 20.3 kN, grease limiting speed 3,600 r/min, oil 4,600 r/min, mass about 2850 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22312EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22312EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22312EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22312EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22312EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22312EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 340 kN C / 319 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22312EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22312EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22312emkd1",
      "＊22312emkd1",
      "22312EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22213EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22213EAD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 65,
    "D_mm": 120,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 226,
    "static_load_kN": 224,
    "fatigue_load_limit_kN": 18.2,
    "limiting_speed_rpm": 4400,
    "max_rpm": 4400,
    "speed_oil_rpm": 5500,
    "weight_g": 1520,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 65 mm shaft, NTN supplies 22213EAD1: sphered outer raceway, two roller rows, pressed sheet-steel window cage (EA high-capacity design), oil speed 5,500 r/min. The leading digits are the ISO 15 dimension series (22200 series); the bore code resolves to 65 mm (two-digit code ×5, with the 00–03 exception table), and 120 mm OD / 31 mm width follow the general plan. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Equivalent-load planning keeps a radial plus moderate axial combination on 22213EAD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Never mount 22213EAD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 120 mm race.",
    "applications": [
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "Mount the 65 mm ring with induction heat or the sleeve drive-up procedure; at 1520 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 226 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 65 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 31 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22213EAD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 226/224 kN ratings, 18.2 kN Pu and 1520 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22213EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22213EAD1?",
        "a": "22213EAD1 is an NTN double-row spherical roller bearing to ISO 15: 65 mm bore, 120 mm OD and 31 mm width (2.559 × 4.724 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 226 kN, C0 224 kN, Pu 18.2 kN, grease limiting speed 4,400 r/min, oil 5,500 r/min, mass about 1520 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22213EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22213EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22213EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22213EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22213EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22213EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 226 kN C / 224 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22213EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22213EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22213ead1",
      "＊22213ead1",
      "22213EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22213EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22213EAKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 65,
    "D_mm": 120,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 226,
    "static_load_kN": 224,
    "fatigue_load_limit_kN": 18.2,
    "limiting_speed_rpm": 4400,
    "max_rpm": 4400,
    "speed_oil_rpm": 5500,
    "weight_g": 1490,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22213EAKD1 belongs to the 22200 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. Reading the full code: the number gives the 65×120 mm envelope, EA names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. Open by design, 22213EAKD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. 65 mm bore is 2.559 in and 120 mm OD is 4.724 in; the ISO 15 envelope swaps between brands, but the 226/224 kN ratings and cage design are NTN 2203E values. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 65 mm set.",
    "applications": [
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "Mount the 65 mm ring with induction heat or the sleeve drive-up procedure; at 1490 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Never substitute 22213EAKD1 by envelope alone: the 224 kN C0 and 18.2 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "Never substitute 22213EAKD1 by envelope alone: the 224 kN C0 and 18.2 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 31 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 226 kN rating no longer applies.",
      "The 226/224 kN ratings, 18.2 kN Pu and 1490 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22213EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22213EAKD1?",
        "a": "22213EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 65 mm bore, 120 mm OD and 31 mm width (2.559 × 4.724 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 226 kN, C0 224 kN, Pu 18.2 kN, grease limiting speed 4,400 r/min, oil 5,500 r/min, mass about 1490 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22213EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22213EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22213EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22213EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22213EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22213EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 226 kN C / 224 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22213EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22213EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22213eakd1",
      "＊22213eakd1",
      "22213EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22213EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22213EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 65,
    "D_mm": 120,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 217,
    "static_load_kN": 212,
    "fatigue_load_limit_kN": 17.2,
    "limiting_speed_rpm": 4400,
    "max_rpm": 4400,
    "speed_oil_rpm": 5500,
    "weight_g": 1530,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 65 mm shaft, NTN supplies 22213EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 5,500 r/min. Digit by digit the code reads as spherical-roller dimension series plus 65 mm bore; the 31 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Suffix reading on 22213EMD1: EM identifies the high-capacity execution with a one-piece machined brass cage; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. Equivalent-load planning keeps a radial plus moderate axial combination on 22213EMD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 65 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "Mount the 65 mm ring with induction heat or the sleeve drive-up procedure; at 1530 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Oil relubrication toward 5,500 r/min needs drain and level design; flooding the 31 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Oil relubrication toward 5,500 r/min needs drain and level design; flooding the 31 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22213EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 31 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 217/212 kN ratings, 17.2 kN Pu and 1530 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22213EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22213EMD1?",
        "a": "22213EMD1 is an NTN double-row spherical roller bearing to ISO 15: 65 mm bore, 120 mm OD and 31 mm width (2.559 × 4.724 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 217 kN, C0 212 kN, Pu 17.2 kN, grease limiting speed 4,400 r/min, oil 5,500 r/min, mass about 1530 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22213EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22213EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22213EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22213EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22213EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22213EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 217 kN C / 212 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22213EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22213EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22213emd1",
      "＊22213emd1",
      "22213EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22213EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22213EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 65,
    "D_mm": 120,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 217,
    "static_load_kN": 212,
    "fatigue_load_limit_kN": 17.2,
    "limiting_speed_rpm": 4400,
    "max_rpm": 4400,
    "speed_oil_rpm": 5500,
    "weight_g": 1500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22213EMKD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 65 mm shaft — 217 kN basic dynamic capacity in a 1500 g, open ISO 15 envelope. Numbering ties 22213EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 65 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. NTN prints two speeds for 22213EMKD1: 4,400 r/min grease and 5,500 r/min oil — the gap of 1,100 r/min reflects oil cooling of the heavy roller set. 65 mm bore is 2.559 in and 120 mm OD is 4.724 in; the ISO 15 envelope swaps between brands, but the 217/212 kN ratings and cage design are NTN 2203E values. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 65 mm set.",
    "applications": [
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Mount the 65 mm ring with induction heat or the sleeve drive-up procedure; at 1500 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Do not confuse EA and EM at the same number: 22213EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 65×120 mm envelope is identical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 65 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22213EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Oil relubrication toward 5,500 r/min needs drain and level design; flooding the 31 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 217/212 kN ratings, 17.2 kN Pu and 1500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22213EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22213EMKD1?",
        "a": "22213EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 65 mm bore, 120 mm OD and 31 mm width (2.559 × 4.724 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 217 kN, C0 212 kN, Pu 17.2 kN, grease limiting speed 4,400 r/min, oil 5,500 r/min, mass about 1500 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22213EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22213EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22213EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22213EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22213EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22213EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 217 kN C / 212 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22213EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22213EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22213emkd1",
      "＊22213emkd1",
      "22213EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21313-NTN",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21313",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 65,
    "D_mm": 140,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 216,
    "static_load_kN": 228,
    "fatigue_load_limit_kN": 31,
    "limiting_speed_rpm": 3100,
    "max_rpm": 3100,
    "speed_oil_rpm": 4000,
    "weight_g": 2550,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 65 mm shaft, NTN supplies 21313: sphered outer raceway, two roller rows, pressed-steel cage of the 213-series C design, oil speed 4,000 r/min. Digit by digit the code reads as spherical-roller dimension series plus 65 mm bore; the 33 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Open by design, 21313 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Grease/oil ratio: the 3,100 r/min limiting value is .78 of the 4,000 r/min oil value; heavy 33 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Never mount 21313 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 140 mm race.",
    "applications": [
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Mount the 65 mm ring with induction heat or the sleeve drive-up procedure; at 2550 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "213-series C/CK executions use the C cage/design code — CK adds the 1:12 tapered bore; quote 21313 in full because a C cannot be mounted on an adapter-sleeve tapered seat.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 65 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Oil relubrication toward 4,000 r/min needs drain and level design; flooding the 33 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 216 kN rating no longer applies.",
      "The 216/228 kN ratings, 31 kN Pu and 2550 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21313 (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21313?",
        "a": "21313 is an NTN double-row spherical roller bearing to ISO 15: 65 mm bore, 140 mm OD and 33 mm width (2.559 × 5.512 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 216 kN, C0 228 kN, Pu 31 kN, grease limiting speed 3,100 r/min, oil 4,000 r/min, mass about 2550 g. It is open, with pressed-steel cage of the 213-series C design."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "21313 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 21313K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21313 is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21313?",
        "a": "21313 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21313 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 216 kN C / 228 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21313",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "21313-EK",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "21313K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 21313K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21313",
      "21313-NTN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21313K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21313K",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 65,
    "D_mm": 140,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 216,
    "static_load_kN": 228,
    "fatigue_load_limit_kN": 31,
    "limiting_speed_rpm": 3100,
    "max_rpm": 3100,
    "speed_oil_rpm": 4000,
    "weight_g": 2510,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 21313K with a 1:12 tapered bore (K) and plain outer ring (no D1/W33 groove): 65 mm bore, 140 mm OD, 33 mm width, rated 3,100 r/min on grease. Numbering ties 21313K to its envelope and execution: same-number EA versus EM or plain variants share the 65 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Suffix reading on 21313K: C is the cage/design code for the NTN 213 series, CK adding the tapered bore; K marks the 1:12 tapered bore; quote the full code because each suffix is a distinct article. Pu 31 kN against C0 228 kN anchors the contamination derating; for dirty mining duty the adjusted life of 21313K moves with cleanliness far more than with small C variations. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 65 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "Mount the 65 mm ring with induction heat or the sleeve drive-up procedure; at 2510 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 21313K on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 65 mm bearing, and drive-up procedures differ.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 21313K on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 33 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 216/228 kN ratings, 31 kN Pu and 2510 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21313K (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21313K?",
        "a": "21313K is an NTN double-row spherical roller bearing to ISO 15: 65 mm bore, 140 mm OD and 33 mm width (2.559 × 5.512 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 216 kN, C0 228 kN, Pu 31 kN, grease limiting speed 3,100 r/min, oil 4,000 r/min, mass about 2510 g. It is open, with pressed-steel cage of the 213-series C design and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 21313K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 21313."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21313K is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21313K?",
        "a": "21313K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21313K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 216 kN C / 228 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21313-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 21313-NTN — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21313k",
      "21313K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22313EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22313EAD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 65,
    "D_mm": 140,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 369,
    "static_load_kN": 343,
    "fatigue_load_limit_kN": 23.4,
    "limiting_speed_rpm": 3300,
    "max_rpm": 3300,
    "speed_oil_rpm": 4100,
    "weight_g": 3480,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22313EAD1 identifies a 65×140×48 mm (2.559 × 5.512 × 1.89 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Reading the full code: the number gives the 65×140 mm envelope, EA names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EA pressed-steel-cage cage. Selection: the C0/C ratio of 0.93 (343/369 kN) reflects the heavy static and shock proportioning of 22313EAD1; size the equivalent load at the required L10 with shock factor for the application. Never mount 22313EAD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 140 mm race.",
    "applications": [
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "Mount the 65 mm ring with induction heat or the sleeve drive-up procedure; at 3480 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Oil relubrication toward 4,100 r/min needs drain and level design; flooding the 48 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The cylindrical-bore 22313EAD1 and its tapered-bore counterpart 22313EAKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22313EAD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Never substitute 22313EAD1 by envelope alone: the 343 kN C0 and 23.4 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 369/343 kN ratings, 23.4 kN Pu and 3480 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22313EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22313EAD1?",
        "a": "22313EAD1 is an NTN double-row spherical roller bearing to ISO 15: 65 mm bore, 140 mm OD and 48 mm width (2.559 × 5.512 × 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 369 kN, C0 343 kN, Pu 23.4 kN, grease limiting speed 3,300 r/min, oil 4,100 r/min, mass about 3480 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22313EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22313EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22313EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22313EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22313EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22313EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 369 kN C / 343 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22313EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22313EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22313ead1",
      "＊22313ead1",
      "22313EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22313EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22313EAKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 65,
    "D_mm": 140,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 369,
    "static_load_kN": 343,
    "fatigue_load_limit_kN": 23.4,
    "limiting_speed_rpm": 3300,
    "max_rpm": 3300,
    "speed_oil_rpm": 4100,
    "weight_g": 3410,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 22313EAKD1 denotes the 65 mm bore spherical roller bearing (369 kN C / 343 kN C0) in the 22300 series, the self-aligning choice for heavy combined load. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (K), lubrication feature (D1); 22313EAKD1 is assembled exactly in that order. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EA pressed-steel-cage cage. Catalogue mass 3410 g (3.41 kg) for the 65×140×48 mm execution includes the EA pressed-steel-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Fillet radii on shaft and housing must clear the ring chamfers of the 48 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Mount the 65 mm ring with induction heat or the sleeve drive-up procedure; at 3410 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 3,300 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Do not confuse EA and EM at the same number: 22313EAKD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 65×140 mm envelope is identical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 3,300 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Never substitute 22313EAKD1 by envelope alone: the 343 kN C0 and 23.4 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 369/343 kN ratings, 23.4 kN Pu and 3410 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22313EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22313EAKD1?",
        "a": "22313EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 65 mm bore, 140 mm OD and 48 mm width (2.559 × 5.512 × 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 369 kN, C0 343 kN, Pu 23.4 kN, grease limiting speed 3,300 r/min, oil 4,100 r/min, mass about 3410 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22313EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22313EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22313EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22313EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22313EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22313EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 369 kN C / 343 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22313EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22313EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22313eakd1",
      "＊22313eakd1",
      "22313EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22313EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22313EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 65,
    "D_mm": 140,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 369,
    "static_load_kN": 343,
    "fatigue_load_limit_kN": 23.4,
    "limiting_speed_rpm": 3300,
    "max_rpm": 3300,
    "speed_oil_rpm": 4100,
    "weight_g": 3500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22313EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 65 mm shaft — 369 kN basic dynamic capacity in a 3500 g, open ISO 15 envelope. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 22313EMD1 is assembled exactly in that order. The 37.5 mm radial section over the 65 mm bore carries two roller rows; capacity per millimetre of bore is about 5.7 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Selection: the C0/C ratio of 0.93 (343/369 kN) reflects the heavy static and shock proportioning of 22313EMD1; size the equivalent load at the required L10 with shock factor for the application. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 65 mm set.",
    "applications": [
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "Mount the 65 mm ring with induction heat or the sleeve drive-up procedure; at 3500 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Never substitute 22313EMD1 by envelope alone: the 343 kN C0 and 23.4 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22313EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 369 kN rating no longer applies.",
      "The cylindrical-bore 22313EMD1 and its tapered-bore counterpart 22313EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 369/343 kN ratings, 23.4 kN Pu and 3500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22313EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22313EMD1?",
        "a": "22313EMD1 is an NTN double-row spherical roller bearing to ISO 15: 65 mm bore, 140 mm OD and 48 mm width (2.559 × 5.512 × 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 369 kN, C0 343 kN, Pu 23.4 kN, grease limiting speed 3,300 r/min, oil 4,100 r/min, mass about 3500 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22313EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22313EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22313EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22313EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22313EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22313EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 369 kN C / 343 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22313EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22313EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22313emd1",
      "＊22313emd1",
      "22313EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22313EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22313EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 65,
    "D_mm": 140,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 369,
    "static_load_kN": 343,
    "fatigue_load_limit_kN": 23.4,
    "limiting_speed_rpm": 3300,
    "max_rpm": 3300,
    "speed_oil_rpm": 4100,
    "weight_g": 3430,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22313EMKD1 identifies a 65×140×48 mm (2.559 × 5.512 × 1.89 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. The leading digits are the ISO 15 dimension series (22300 series); the bore code resolves to 65 mm (two-digit code ×5, with the 00–03 exception table), and 140 mm OD / 48 mm width follow the general plan. At 369 kN C and 3430 g mass the 22300 series part is built for shock and vibration; the 48 mm-wide ring needs square abutments to keep both rows equally loaded. Pu 23.4 kN against C0 343 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22313EMKD1 moves with cleanliness far more than with small C variations. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 65 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Mount the 65 mm ring with induction heat or the sleeve drive-up procedure; at 3430 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 65 mm bearing, and drive-up procedures differ.",
      "Never substitute 22313EMKD1 by envelope alone: the 343 kN C0 and 23.4 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22313EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 3,300 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 369/343 kN ratings, 23.4 kN Pu and 3430 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22313EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22313EMKD1?",
        "a": "22313EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 65 mm bore, 140 mm OD and 48 mm width (2.559 × 5.512 × 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 369 kN, C0 343 kN, Pu 23.4 kN, grease limiting speed 3,300 r/min, oil 4,100 r/min, mass about 3430 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22313EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22313EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22313EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22313EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22313EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22313EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 369 kN C / 343 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22313EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22313EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22313emkd1",
      "＊22313emkd1",
      "22313EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22214EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22214EAD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 70,
    "D_mm": 125,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 235,
    "static_load_kN": 240,
    "fatigue_load_limit_kN": 20.1,
    "limiting_speed_rpm": 4100,
    "max_rpm": 4100,
    "speed_oil_rpm": 5200,
    "weight_g": 1610,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22214EAD1 identifies a 70×125×31 mm (2.756 × 4.921 × 1.22 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 70 mm bore; the 31 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Open by design, 22214EAD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Grease/oil ratio: the 4,100 r/min limiting value is .79 of the 5,200 r/min oil value; heavy 31 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Never mount 22214EAD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 125 mm race.",
    "applications": [
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Mount the 70 mm ring with induction heat or the sleeve drive-up procedure; at 1610 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 70 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Do not confuse EA and EM at the same number: 22214EAD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 70×125 mm envelope is identical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 235 kN rating no longer applies.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 235 kN rating no longer applies.",
      "The 235/240 kN ratings, 20.1 kN Pu and 1610 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22214EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22214EAD1?",
        "a": "22214EAD1 is an NTN double-row spherical roller bearing to ISO 15: 70 mm bore, 125 mm OD and 31 mm width (2.756 × 4.921 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 235 kN, C0 240 kN, Pu 20.1 kN, grease limiting speed 4,100 r/min, oil 5,200 r/min, mass about 1610 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22214EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22214EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22214EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22214EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22214EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22214EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 235 kN C / 240 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22214EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22214EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22214ead1",
      "＊22214ead1",
      "22214EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22214EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22214EAKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 70,
    "D_mm": 125,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 235,
    "static_load_kN": 240,
    "fatigue_load_limit_kN": 20.1,
    "limiting_speed_rpm": 4100,
    "max_rpm": 4100,
    "speed_oil_rpm": 5200,
    "weight_g": 1580,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22214EAKD1 belongs to the 22200 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. Numbering ties 22214EAKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 70 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Suffix reading on 22214EAKD1: EA identifies the high-capacity execution with a pressed sheet-steel window cage; K marks the 1:12 tapered bore; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. With about 3.4 kN of C per millimetre of the 70 mm bore, 22214EAKD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 70 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Mount the 70 mm ring with induction heat or the sleeve drive-up procedure; at 1580 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 4,100 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 4,100 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22214EAD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 31 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 235/240 kN ratings, 20.1 kN Pu and 1580 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22214EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22214EAKD1?",
        "a": "22214EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 70 mm bore, 125 mm OD and 31 mm width (2.756 × 4.921 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 235 kN, C0 240 kN, Pu 20.1 kN, grease limiting speed 4,100 r/min, oil 5,200 r/min, mass about 1580 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22214EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22214EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22214EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22214EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22214EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22214EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 235 kN C / 240 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22214EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22214EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22214eakd1",
      "＊22214eakd1",
      "22214EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22214EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22214EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 70,
    "D_mm": 125,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 235,
    "static_load_kN": 240,
    "fatigue_load_limit_kN": 20.1,
    "limiting_speed_rpm": 4100,
    "max_rpm": 4100,
    "speed_oil_rpm": 5200,
    "weight_g": 1640,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22214EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 70 mm shaft — 235 kN basic dynamic capacity in a 1640 g, open ISO 15 envelope. Reading the full code: the number gives the 70×125 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. NTN prints two speeds for 22214EMD1: 4,100 r/min grease and 5,200 r/min oil — the gap of 1,100 r/min reflects oil cooling of the heavy roller set. Grease/oil ratio: the 4,100 r/min limiting value is .79 of the 5,200 r/min oil value; heavy 31 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 70 mm set.",
    "applications": [
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Mount the 70 mm ring with induction heat or the sleeve drive-up procedure; at 1640 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 235 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 70 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The cylindrical-bore 22214EMD1 and its tapered-bore counterpart 22214EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Oil relubrication toward 5,200 r/min needs drain and level design; flooding the 31 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 235/240 kN ratings, 20.1 kN Pu and 1640 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22214EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22214EMD1?",
        "a": "22214EMD1 is an NTN double-row spherical roller bearing to ISO 15: 70 mm bore, 125 mm OD and 31 mm width (2.756 × 4.921 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 235 kN, C0 240 kN, Pu 20.1 kN, grease limiting speed 4,100 r/min, oil 5,200 r/min, mass about 1640 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22214EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22214EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22214EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22214EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22214EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22214EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 235 kN C / 240 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22214EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22214EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22214emd1",
      "＊22214emd1",
      "22214EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22214EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22214EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 70,
    "D_mm": 125,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 235,
    "static_load_kN": 240,
    "fatigue_load_limit_kN": 20.1,
    "limiting_speed_rpm": 4100,
    "max_rpm": 4100,
    "speed_oil_rpm": 5200,
    "weight_g": 1600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22214EMKD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 70 mm shaft — 235 kN basic dynamic capacity in a 1600 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 70 mm bore; the 31 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Catalogue mass 1600 g (1.60 kg) for the 70×125×31 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "Mount the 70 mm ring with induction heat or the sleeve drive-up procedure; at 1600 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 70 mm bearing, and drive-up procedures differ.",
      "Oil relubrication toward 5,200 r/min needs drain and level design; flooding the 31 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Never substitute 22214EMKD1 by envelope alone: the 240 kN C0 and 20.1 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22214EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 235/240 kN ratings, 20.1 kN Pu and 1600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22214EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22214EMKD1?",
        "a": "22214EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 70 mm bore, 125 mm OD and 31 mm width (2.756 × 4.921 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 235 kN, C0 240 kN, Pu 20.1 kN, grease limiting speed 4,100 r/min, oil 5,200 r/min, mass about 1600 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22214EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22214EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22214EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22214EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22214EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22214EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 235 kN C / 240 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22214EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22214EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22214emkd1",
      "＊22214emkd1",
      "22214EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21314-NTN",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21314",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 70,
    "D_mm": 150,
    "B_mm": 35,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 245,
    "static_load_kN": 262,
    "fatigue_load_limit_kN": 33.5,
    "limiting_speed_rpm": 2900,
    "max_rpm": 2900,
    "speed_oil_rpm": 3800,
    "weight_g": 3180,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "21314 is the C design-code execution of NTN's spherical roller range for a 70 mm shaft — 245 kN basic dynamic capacity in a 3180 g, open ISO 15 envelope. Reading the full code: the number gives the 70×150 mm envelope, C/CK names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and plain outer ring (no D1/W33 groove) completes the order number. Suffix reading on 21314: C is the cage/design code for the NTN 213 series, CK adding the tapered bore; quote the full code because each suffix is a distinct article. 70 mm bore is 2.756 in and 150 mm OD is 5.906 in; the ISO 15 envelope swaps between brands, but the 245/262 kN ratings and cage design are NTN 2203E values. Fillet radii on shaft and housing must clear the ring chamfers of the 35 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "Mount the 70 mm ring with induction heat or the sleeve drive-up procedure; at 3180 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Never substitute 21314 by envelope alone: the 262 kN C0 and 33.5 kN Pu are specific to the NTN C design-code execution, and vibrating duty depends heavily on cage identity.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 21314 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 35 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 35 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 245/262 kN ratings, 33.5 kN Pu and 3180 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21314 (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21314?",
        "a": "21314 is an NTN double-row spherical roller bearing to ISO 15: 70 mm bore, 150 mm OD and 35 mm width (2.756 × 5.906 × 1.378 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 245 kN, C0 262 kN, Pu 33.5 kN, grease limiting speed 2,900 r/min, oil 3,800 r/min, mass about 3180 g. It is open, with pressed-steel cage of the 213-series C design."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "21314 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 21314K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21314 is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21314?",
        "a": "21314 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21314 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 245 kN C / 262 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21314",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "21314-EK",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "21314K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 21314K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21314",
      "21314-NTN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21314K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21314K",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 70,
    "D_mm": 150,
    "B_mm": 35,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 245,
    "static_load_kN": 262,
    "fatigue_load_limit_kN": 33.5,
    "limiting_speed_rpm": 2900,
    "max_rpm": 2900,
    "speed_oil_rpm": 3800,
    "weight_g": 3140,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 21314K identifies a 70×150×35 mm (2.756 × 5.906 × 1.378 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. The leading digits are the ISO 15 dimension series (21300 series); the bore code resolves to 70 mm (two-digit code ×5, with the 00–03 exception table), and 150 mm OD / 35 mm width follow the general plan. NTN prints two speeds for 21314K: 2,900 r/min grease and 3,800 r/min oil — the gap of 900 r/min reflects oil cooling of the heavy roller set. Catalogue mass 3140 g (3.14 kg) for the 70×150×35 mm execution includes the C design-code cage and both roller rows; shaft and housing shoulders must support that ring squarely. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 21314K leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Mount the 70 mm ring with induction heat or the sleeve drive-up procedure; at 3140 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Never substitute 21314K by envelope alone: the 262 kN C0 and 33.5 kN Pu are specific to the NTN C design-code execution, and vibrating duty depends heavily on cage identity.",
      "213-series C/CK executions use the C cage/design code — CK adds the 1:12 tapered bore; quote 21314K in full because a C cannot be mounted on an adapter-sleeve tapered seat.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 35 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Oil relubrication toward 3,800 r/min needs drain and level design; flooding the 35 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 245/262 kN ratings, 33.5 kN Pu and 3140 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21314K (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21314K?",
        "a": "21314K is an NTN double-row spherical roller bearing to ISO 15: 70 mm bore, 150 mm OD and 35 mm width (2.756 × 5.906 × 1.378 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 245 kN, C0 262 kN, Pu 33.5 kN, grease limiting speed 2,900 r/min, oil 3,800 r/min, mass about 3140 g. It is open, with pressed-steel cage of the 213-series C design and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 21314K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 21314."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21314K is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21314K?",
        "a": "21314K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21314K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 245 kN C / 262 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21314-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 21314-NTN — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21314k",
      "21314K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22314EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22314EAD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 70,
    "D_mm": 150,
    "B_mm": 51,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 420,
    "static_load_kN": 396,
    "fatigue_load_limit_kN": 26,
    "limiting_speed_rpm": 3000,
    "max_rpm": 3000,
    "speed_oil_rpm": 3800,
    "weight_g": 4250,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22314EAD1 belongs to the 22300 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (cylindrical), lubrication feature (D1); 22314EAD1 is assembled exactly in that order. The cylindrical bore fits a machined 70 mm shaft seat directly; the same envelope in 22314EAKD1 (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. The 40.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 51 mm-wide ring seats fully on both sides. Never mount 22314EAD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 150 mm race.",
    "applications": [
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Mount the 70 mm ring with induction heat or the sleeve drive-up procedure; at 4250 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 420 kN rating no longer applies.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22314EAD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Never substitute 22314EAD1 by envelope alone: the 396 kN C0 and 26 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "Do not confuse EA and EM at the same number: 22314EAD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 70×150 mm envelope is identical.",
      "The 420/396 kN ratings, 26 kN Pu and 4250 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22314EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22314EAD1?",
        "a": "22314EAD1 is an NTN double-row spherical roller bearing to ISO 15: 70 mm bore, 150 mm OD and 51 mm width (2.756 × 5.906 × 2.008 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 420 kN, C0 396 kN, Pu 26 kN, grease limiting speed 3,000 r/min, oil 3,800 r/min, mass about 4250 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22314EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22314EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22314EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22314EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22314EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22314EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 420 kN C / 396 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22314EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22314EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22314ead1",
      "＊22314ead1",
      "22314EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22314EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22314EAKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 70,
    "D_mm": 150,
    "B_mm": 51,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 420,
    "static_load_kN": 396,
    "fatigue_load_limit_kN": 26,
    "limiting_speed_rpm": 3000,
    "max_rpm": 3000,
    "speed_oil_rpm": 3800,
    "weight_g": 4160,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 22314EAKD1 denotes the 70 mm bore spherical roller bearing (420 kN C / 396 kN C0) in the 22300 series, the self-aligning choice for heavy combined load. Digit by digit the code reads as spherical-roller dimension series plus 70 mm bore; the 51 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Pu 26 kN is the catalogue fatigue load limit for 22314EAKD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Catalogue mass 4160 g (4.16 kg) for the 70×150×51 mm execution includes the EA pressed-steel-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Mount 22314EAKD1 on its adapter or withdrawal sleeve on the 70 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Mount the 70 mm ring with induction heat or the sleeve drive-up procedure; at 4160 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Do not confuse EA and EM at the same number: 22314EAKD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 70×150 mm envelope is identical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 70 mm bearing, and drive-up procedures differ.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22314EAD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22314EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 420/396 kN ratings, 26 kN Pu and 4160 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22314EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22314EAKD1?",
        "a": "22314EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 70 mm bore, 150 mm OD and 51 mm width (2.756 × 5.906 × 2.008 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 420 kN, C0 396 kN, Pu 26 kN, grease limiting speed 3,000 r/min, oil 3,800 r/min, mass about 4160 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22314EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22314EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22314EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22314EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22314EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22314EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 420 kN C / 396 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22314EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22314EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22314eakd1",
      "＊22314eakd1",
      "22314EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22314EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22314EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 70,
    "D_mm": 150,
    "B_mm": 51,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 420,
    "static_load_kN": 396,
    "fatigue_load_limit_kN": 26,
    "limiting_speed_rpm": 3000,
    "max_rpm": 3000,
    "speed_oil_rpm": 3800,
    "weight_g": 4310,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 70 mm shaft, NTN supplies 22314EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 3,800 r/min. Numbering ties 22314EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 70 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Suffix reading on 22314EMD1: EM identifies the high-capacity execution with a one-piece machined brass cage; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. The 40.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 51 mm-wide ring seats fully on both sides. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 70 mm set.",
    "applications": [
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Mount the 70 mm ring with induction heat or the sleeve drive-up procedure; at 4310 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Oil relubrication toward 3,800 r/min needs drain and level design; flooding the 51 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The cylindrical-bore 22314EMD1 and its tapered-bore counterpart 22314EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Do not confuse EA and EM at the same number: 22314EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 70×150 mm envelope is identical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 51 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 420/396 kN ratings, 26 kN Pu and 4310 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22314EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22314EMD1?",
        "a": "22314EMD1 is an NTN double-row spherical roller bearing to ISO 15: 70 mm bore, 150 mm OD and 51 mm width (2.756 × 5.906 × 2.008 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 420 kN, C0 396 kN, Pu 26 kN, grease limiting speed 3,000 r/min, oil 3,800 r/min, mass about 4310 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22314EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22314EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22314EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22314EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22314EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22314EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 420 kN C / 396 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22314EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22314EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22314emd1",
      "＊22314emd1",
      "22314EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22314EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22314EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 70,
    "D_mm": 150,
    "B_mm": 51,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 420,
    "static_load_kN": 396,
    "fatigue_load_limit_kN": 26,
    "limiting_speed_rpm": 3000,
    "max_rpm": 3000,
    "speed_oil_rpm": 3800,
    "weight_g": 4220,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22314EMKD1 identifies a 70×150×51 mm (2.756 × 5.906 × 2.008 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 22314EMKD1 is assembled exactly in that order. Two symmetric roller rows share the load: C 420 kN, C0 396 kN (C0/C ≈ 0.94), with useful axial capacity in either direction alongside the dominant radial load. Catalogue mass 4220 g (4.22 kg) for the 70×150×51 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Mount 22314EMKD1 on its adapter or withdrawal sleeve on the 70 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Mount the 70 mm ring with induction heat or the sleeve drive-up procedure; at 4220 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22314EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 3,000 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 420 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 70 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 420/396 kN ratings, 26 kN Pu and 4220 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22314EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22314EMKD1?",
        "a": "22314EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 70 mm bore, 150 mm OD and 51 mm width (2.756 × 5.906 × 2.008 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 420 kN, C0 396 kN, Pu 26 kN, grease limiting speed 3,000 r/min, oil 3,800 r/min, mass about 4220 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22314EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22314EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22314EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22314EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22314EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22314EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 420 kN C / 396 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22314EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22314EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22314emkd1",
      "＊22314emkd1",
      "22314EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22215EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22215EAD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 75,
    "D_mm": 130,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 244,
    "static_load_kN": 249,
    "fatigue_load_limit_kN": 21.1,
    "limiting_speed_rpm": 4000,
    "max_rpm": 4000,
    "speed_oil_rpm": 5000,
    "weight_g": 1670,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22215EAD1 belongs to the 22200 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. Reading the full code: the number gives the 75×130 mm envelope, EA names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. The 27.5 mm radial section over the 75 mm bore carries two roller rows; capacity per millimetre of bore is about 3.3 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. 75 mm bore is 2.953 in and 130 mm OD is 5.118 in; the ISO 15 envelope swaps between brands, but the 244/249 kN ratings and cage design are NTN 2203E values. Never mount 22215EAD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 130 mm race.",
    "applications": [
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "Mount the 75 mm ring with induction heat or the sleeve drive-up procedure; at 1670 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22215EAD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 244 kN rating no longer applies.",
      "Do not confuse EA and EM at the same number: 22215EAD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 75×130 mm envelope is identical.",
      "The cylindrical-bore 22215EAD1 and its tapered-bore counterpart 22215EAKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 244/249 kN ratings, 21.1 kN Pu and 1670 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22215EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22215EAD1?",
        "a": "22215EAD1 is an NTN double-row spherical roller bearing to ISO 15: 75 mm bore, 130 mm OD and 31 mm width (2.953 × 5.118 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 244 kN, C0 249 kN, Pu 21.1 kN, grease limiting speed 4,000 r/min, oil 5,000 r/min, mass about 1670 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22215EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22215EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22215EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22215EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22215EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22215EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 244 kN C / 249 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22215EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22215EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22215ead1",
      "＊22215ead1",
      "22215EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22215EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22215EAKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 75,
    "D_mm": 130,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 244,
    "static_load_kN": 249,
    "fatigue_load_limit_kN": 21.1,
    "limiting_speed_rpm": 4000,
    "max_rpm": 4000,
    "speed_oil_rpm": 5000,
    "weight_g": 1640,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22215EAKD1 belongs to the 22200 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. Digit by digit the code reads as spherical-roller dimension series plus 75 mm bore; the 31 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EA pressed-steel-cage cage. Pu 21.1 kN against C0 249 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22215EAKD1 moves with cleanliness far more than with small C variations. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 75 mm set.",
    "applications": [
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "Mount the 75 mm ring with induction heat or the sleeve drive-up procedure; at 1640 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 31 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 31 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 22215EAKD1 by envelope alone: the 249 kN C0 and 21.1 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "Never substitute 22215EAKD1 by envelope alone: the 249 kN C0 and 21.1 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 244/249 kN ratings, 21.1 kN Pu and 1640 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22215EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22215EAKD1?",
        "a": "22215EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 75 mm bore, 130 mm OD and 31 mm width (2.953 × 5.118 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 244 kN, C0 249 kN, Pu 21.1 kN, grease limiting speed 4,000 r/min, oil 5,000 r/min, mass about 1640 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22215EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22215EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22215EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22215EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22215EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22215EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 244 kN C / 249 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22215EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22215EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22215eakd1",
      "＊22215eakd1",
      "22215EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22215EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22215EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 75,
    "D_mm": 130,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 244,
    "static_load_kN": 249,
    "fatigue_load_limit_kN": 21.1,
    "limiting_speed_rpm": 4000,
    "max_rpm": 4000,
    "speed_oil_rpm": 5000,
    "weight_g": 1710,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 75 mm shaft, NTN supplies 22215EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 5,000 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 22215EMD1 is assembled exactly in that order. At 244 kN C and 1710 g mass the 22200 series part is built for shock and vibration; the 31 mm-wide ring needs square abutments to keep both rows equally loaded. 75 mm bore is 2.953 in and 130 mm OD is 5.118 in; the ISO 15 envelope swaps between brands, but the 244/249 kN ratings and cage design are NTN 2203E values. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 75 mm set.",
    "applications": [
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Mount the 75 mm ring with induction heat or the sleeve drive-up procedure; at 1710 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 75 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Do not confuse EA and EM at the same number: 22215EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 75×130 mm envelope is identical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22215EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 4,000 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 244/249 kN ratings, 21.1 kN Pu and 1710 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22215EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22215EMD1?",
        "a": "22215EMD1 is an NTN double-row spherical roller bearing to ISO 15: 75 mm bore, 130 mm OD and 31 mm width (2.953 × 5.118 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 244 kN, C0 249 kN, Pu 21.1 kN, grease limiting speed 4,000 r/min, oil 5,000 r/min, mass about 1710 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22215EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22215EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22215EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22215EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22215EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22215EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 244 kN C / 249 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22215EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22215EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22215emd1",
      "＊22215emd1",
      "22215EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22215EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22215EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 75,
    "D_mm": 130,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 244,
    "static_load_kN": 249,
    "fatigue_load_limit_kN": 21.1,
    "limiting_speed_rpm": 4000,
    "max_rpm": 4000,
    "speed_oil_rpm": 5000,
    "weight_g": 1670,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22215EMKD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 75 mm shaft — 244 kN basic dynamic capacity in a 1670 g, open ISO 15 envelope. Numbering ties 22215EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 75 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. At 244 kN C and 1670 g mass the 22200 series part is built for shock and vibration; the 31 mm-wide ring needs square abutments to keep both rows equally loaded. Catalogue mass 1670 g (1.67 kg) for the 75×130×31 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22215EMKD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "Mount the 75 mm ring with induction heat or the sleeve drive-up procedure; at 1670 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22215EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22215EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Oil relubrication toward 5,000 r/min needs drain and level design; flooding the 31 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 4,000 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 244/249 kN ratings, 21.1 kN Pu and 1670 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22215EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22215EMKD1?",
        "a": "22215EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 75 mm bore, 130 mm OD and 31 mm width (2.953 × 5.118 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 244 kN, C0 249 kN, Pu 21.1 kN, grease limiting speed 4,000 r/min, oil 5,000 r/min, mass about 1670 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22215EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22215EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22215EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22215EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22215EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22215EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 244 kN C / 249 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22215EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22215EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22215emkd1",
      "＊22215emkd1",
      "22215EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21315-NTN",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21315",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 75,
    "D_mm": 160,
    "B_mm": 37,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 266,
    "static_load_kN": 287,
    "fatigue_load_limit_kN": 27.5,
    "limiting_speed_rpm": 2700,
    "max_rpm": 2700,
    "speed_oil_rpm": 3500,
    "weight_g": 3810,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 75 mm shaft, NTN supplies 21315: sphered outer raceway, two roller rows, pressed-steel cage of the 213-series C design, oil speed 3,500 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (C/CK), bore (cylindrical), lubrication feature (none); 21315 is assembled exactly in that order. Pu 27.5 kN is the catalogue fatigue load limit for 21315, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. With about 3.5 kN of C per millimetre of the 75 mm bore, 21315 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Fillet radii on shaft and housing must clear the ring chamfers of the 37 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Mount the 75 mm ring with induction heat or the sleeve drive-up procedure; at 3810 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Oil relubrication toward 3,500 r/min needs drain and level design; flooding the 37 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "213-series C/CK executions use the C cage/design code — CK adds the 1:12 tapered bore; quote 21315 in full because a C cannot be mounted on an adapter-sleeve tapered seat.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 266 kN rating no longer applies.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 21315 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 266/287 kN ratings, 27.5 kN Pu and 3810 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21315 (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21315?",
        "a": "21315 is an NTN double-row spherical roller bearing to ISO 15: 75 mm bore, 160 mm OD and 37 mm width (2.953 × 6.299 × 1.457 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 266 kN, C0 287 kN, Pu 27.5 kN, grease limiting speed 2,700 r/min, oil 3,500 r/min, mass about 3810 g. It is open, with pressed-steel cage of the 213-series C design."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "21315 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 21315K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21315 is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21315?",
        "a": "21315 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21315 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 266 kN C / 287 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21315",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "21315-EK",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "21315K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 21315K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21315",
      "21315-NTN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21315K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21315K",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 75,
    "D_mm": 160,
    "B_mm": 37,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 266,
    "static_load_kN": 287,
    "fatigue_load_limit_kN": 27.5,
    "limiting_speed_rpm": 2700,
    "max_rpm": 2700,
    "speed_oil_rpm": 3500,
    "weight_g": 3760,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 21315K denotes the 75 mm bore spherical roller bearing (266 kN C / 287 kN C0) in the 21300 series, the self-aligning choice for heavy combined load. Digit by digit the code reads as spherical-roller dimension series plus 75 mm bore; the 37 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. With about 3.5 kN of C per millimetre of the 75 mm bore, 21315K screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Mount 21315K on its adapter or withdrawal sleeve on the 75 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "Mount the 75 mm ring with induction heat or the sleeve drive-up procedure; at 3760 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 75 mm bearing, and drive-up procedures differ.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 75 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,700 r/min grease rating is lost to abrasive wear long before fatigue.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 75 mm bearing, and drive-up procedures differ.",
      "The 266/287 kN ratings, 27.5 kN Pu and 3760 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21315K (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21315K?",
        "a": "21315K is an NTN double-row spherical roller bearing to ISO 15: 75 mm bore, 160 mm OD and 37 mm width (2.953 × 6.299 × 1.457 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 266 kN, C0 287 kN, Pu 27.5 kN, grease limiting speed 2,700 r/min, oil 3,500 r/min, mass about 3760 g. It is open, with pressed-steel cage of the 213-series C design and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 21315K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 21315."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21315K is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21315K?",
        "a": "21315K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21315K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 266 kN C / 287 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21315-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 21315-NTN — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21315k",
      "21315K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22315EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22315EAD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 75,
    "D_mm": 160,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 491,
    "static_load_kN": 467,
    "fatigue_load_limit_kN": 29.8,
    "limiting_speed_rpm": 2900,
    "max_rpm": 2900,
    "speed_oil_rpm": 3600,
    "weight_g": 5180,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22315EAD1 identifies a 75×160×55 mm (2.953 × 6.299 × 2.165 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Numbering ties 22315EAD1 to its envelope and execution: same-number EA versus EM or plain variants share the 75 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Open by design, 22315EAD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Equivalent-load planning keeps a radial plus moderate axial combination on 22315EAD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Fillet radii on shaft and housing must clear the ring chamfers of the 55 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "Mount the 75 mm ring with induction heat or the sleeve drive-up procedure; at 5180 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 75 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 75 mm bearing, and drive-up procedures differ.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 75 mm bearing, and drive-up procedures differ.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 491 kN rating no longer applies.",
      "The 491/467 kN ratings, 29.8 kN Pu and 5180 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22315EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22315EAD1?",
        "a": "22315EAD1 is an NTN double-row spherical roller bearing to ISO 15: 75 mm bore, 160 mm OD and 55 mm width (2.953 × 6.299 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 491 kN, C0 467 kN, Pu 29.8 kN, grease limiting speed 2,900 r/min, oil 3,600 r/min, mass about 5180 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22315EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22315EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22315EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22315EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22315EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22315EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 491 kN C / 467 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22315EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22315EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22315ead1",
      "＊22315ead1",
      "22315EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22315EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22315EAKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 75,
    "D_mm": 160,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 491,
    "static_load_kN": 467,
    "fatigue_load_limit_kN": 29.8,
    "limiting_speed_rpm": 2900,
    "max_rpm": 2900,
    "speed_oil_rpm": 3600,
    "weight_g": 5070,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 22315EAKD1 denotes the 75 mm bore spherical roller bearing (491 kN C / 467 kN C0) in the 22300 series, the self-aligning choice for heavy combined load. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (K), lubrication feature (D1); 22315EAKD1 is assembled exactly in that order. The 1:12 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 75 mm bore assembly. Speed planning: 2,900 r/min grease limiting speed is the cage/kinematic ceiling and 3,600 r/min is the oil-lubricated value for the 75 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 75 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "Mount the 75 mm ring with induction heat or the sleeve drive-up procedure; at 5070 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 75 mm bearing, and drive-up procedures differ.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22315EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Never substitute 22315EAKD1 by envelope alone: the 467 kN C0 and 29.8 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "Do not confuse EA and EM at the same number: 22315EAKD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 75×160 mm envelope is identical.",
      "The 491/467 kN ratings, 29.8 kN Pu and 5070 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22315EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22315EAKD1?",
        "a": "22315EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 75 mm bore, 160 mm OD and 55 mm width (2.953 × 6.299 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 491 kN, C0 467 kN, Pu 29.8 kN, grease limiting speed 2,900 r/min, oil 3,600 r/min, mass about 5070 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22315EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22315EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22315EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22315EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22315EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22315EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 491 kN C / 467 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22315EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22315EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22315eakd1",
      "＊22315eakd1",
      "22315EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22315EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22315EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 75,
    "D_mm": 160,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 491,
    "static_load_kN": 467,
    "fatigue_load_limit_kN": 29.8,
    "limiting_speed_rpm": 2900,
    "max_rpm": 2900,
    "speed_oil_rpm": 3600,
    "weight_g": 5270,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22315EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 75 mm shaft — 491 kN basic dynamic capacity in a 5270 g, open ISO 15 envelope. The leading digits are the ISO 15 dimension series (22300 series); the bore code resolves to 75 mm (two-digit code ×5, with the 00–03 exception table), and 160 mm OD / 55 mm width follow the general plan. NTN prints two speeds for 22315EMD1: 2,900 r/min grease and 3,600 r/min oil — the gap of 700 r/min reflects oil cooling of the heavy roller set. Equivalent-load planning keeps a radial plus moderate axial combination on 22315EMD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "Mount the 75 mm ring with induction heat or the sleeve drive-up procedure; at 5270 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 491 kN rating no longer applies.",
      "Oil relubrication toward 3,600 r/min needs drain and level design; flooding the 55 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 75 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Oil relubrication toward 3,600 r/min needs drain and level design; flooding the 55 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 491/467 kN ratings, 29.8 kN Pu and 5270 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22315EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22315EMD1?",
        "a": "22315EMD1 is an NTN double-row spherical roller bearing to ISO 15: 75 mm bore, 160 mm OD and 55 mm width (2.953 × 6.299 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 491 kN, C0 467 kN, Pu 29.8 kN, grease limiting speed 2,900 r/min, oil 3,600 r/min, mass about 5270 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22315EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22315EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22315EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22315EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22315EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22315EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 491 kN C / 467 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22315EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22315EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22315emd1",
      "＊22315emd1",
      "22315EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22315EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22315EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 75,
    "D_mm": 160,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 491,
    "static_load_kN": 467,
    "fatigue_load_limit_kN": 29.8,
    "limiting_speed_rpm": 2900,
    "max_rpm": 2900,
    "speed_oil_rpm": 3600,
    "weight_g": 5160,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22315EMKD1 identifies a 75×160×55 mm (2.953 × 6.299 × 2.165 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. The leading digits are the ISO 15 dimension series (22300 series); the bore code resolves to 75 mm (two-digit code ×5, with the 00–03 exception table), and 160 mm OD / 55 mm width follow the general plan. Suffix reading on 22315EMKD1: EM identifies the high-capacity execution with a one-piece machined brass cage; K marks the 1:12 tapered bore; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. Speed planning: 2,900 r/min grease limiting speed is the cage/kinematic ceiling and 3,600 r/min is the oil-lubricated value for the 75 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 75 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Mount the 75 mm ring with induction heat or the sleeve drive-up procedure; at 5160 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 75 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 55 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 75 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 55 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 491/467 kN ratings, 29.8 kN Pu and 5160 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22315EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22315EMKD1?",
        "a": "22315EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 75 mm bore, 160 mm OD and 55 mm width (2.953 × 6.299 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 491 kN, C0 467 kN, Pu 29.8 kN, grease limiting speed 2,900 r/min, oil 3,600 r/min, mass about 5160 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22315EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22315EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22315EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22315EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22315EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22315EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 491 kN C / 467 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22315EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22315EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22315emkd1",
      "＊22315emkd1",
      "22315EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22216EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22216EAD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 80,
    "D_mm": 140,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 278,
    "static_load_kN": 287,
    "fatigue_load_limit_kN": 24,
    "limiting_speed_rpm": 3700,
    "max_rpm": 3700,
    "speed_oil_rpm": 4600,
    "weight_g": 2090,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22216EAD1 identifies a 80×140×33 mm (3.15 × 5.512 × 1.299 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (cylindrical), lubrication feature (D1); 22216EAD1 is assembled exactly in that order. Pu 24 kN is the catalogue fatigue load limit for 22216EAD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. With about 3.5 kN of C per millimetre of the 80 mm bore, 22216EAD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Fillet radii on shaft and housing must clear the ring chamfers of the 33 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Mount the 80 mm ring with induction heat or the sleeve drive-up procedure; at 2090 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22216EAD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22216EAD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 80 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22216EAD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 278/287 kN ratings, 24 kN Pu and 2090 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22216EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22216EAD1?",
        "a": "22216EAD1 is an NTN double-row spherical roller bearing to ISO 15: 80 mm bore, 140 mm OD and 33 mm width (3.15 × 5.512 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 278 kN, C0 287 kN, Pu 24 kN, grease limiting speed 3,700 r/min, oil 4,600 r/min, mass about 2090 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22216EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22216EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22216EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22216EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22216EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22216EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 278 kN C / 287 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22216EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22216EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22216ead1",
      "＊22216ead1",
      "22216EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22216EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22216EAKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 80,
    "D_mm": 140,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 278,
    "static_load_kN": 287,
    "fatigue_load_limit_kN": 24,
    "limiting_speed_rpm": 3700,
    "max_rpm": 3700,
    "speed_oil_rpm": 4600,
    "weight_g": 2050,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 80 mm shaft, NTN supplies 22216EAKD1: sphered outer raceway, two roller rows, pressed sheet-steel window cage (EA high-capacity design), oil speed 4,600 r/min. Numbering ties 22216EAKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 80 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. NTN prints two speeds for 22216EAKD1: 3,700 r/min grease and 4,600 r/min oil — the gap of 900 r/min reflects oil cooling of the heavy roller set. Pu 24 kN against C0 287 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22216EAKD1 moves with cleanliness far more than with small C variations. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22216EAKD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Mount the 80 mm ring with induction heat or the sleeve drive-up procedure; at 2050 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 80 mm bearing, and drive-up procedures differ.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 278 kN rating no longer applies.",
      "Oil relubrication toward 4,600 r/min needs drain and level design; flooding the 33 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Oil relubrication toward 4,600 r/min needs drain and level design; flooding the 33 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 278/287 kN ratings, 24 kN Pu and 2050 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22216EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22216EAKD1?",
        "a": "22216EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 80 mm bore, 140 mm OD and 33 mm width (3.15 × 5.512 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 278 kN, C0 287 kN, Pu 24 kN, grease limiting speed 3,700 r/min, oil 4,600 r/min, mass about 2050 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22216EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22216EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22216EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22216EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22216EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22216EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 278 kN C / 287 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22216EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22216EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22216eakd1",
      "＊22216eakd1",
      "22216EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22216EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22216EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 80,
    "D_mm": 140,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 267,
    "static_load_kN": 272,
    "fatigue_load_limit_kN": 22.8,
    "limiting_speed_rpm": 3700,
    "max_rpm": 3700,
    "speed_oil_rpm": 4600,
    "weight_g": 2110,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22216EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 80 mm shaft — 267 kN basic dynamic capacity in a 2110 g, open ISO 15 envelope. Numbering ties 22216EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 80 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Two symmetric roller rows share the load: C 267 kN, C0 272 kN (C0/C ≈ 1.02), with useful axial capacity in either direction alongside the dominant radial load. With about 3.3 kN of C per millimetre of the 80 mm bore, 22216EMD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "Mount the 80 mm ring with induction heat or the sleeve drive-up procedure; at 2110 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22216EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The cylindrical-bore 22216EMD1 and its tapered-bore counterpart 22216EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Never substitute 22216EMD1 by envelope alone: the 272 kN C0 and 22.8 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 80 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 267/272 kN ratings, 22.8 kN Pu and 2110 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22216EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22216EMD1?",
        "a": "22216EMD1 is an NTN double-row spherical roller bearing to ISO 15: 80 mm bore, 140 mm OD and 33 mm width (3.15 × 5.512 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 267 kN, C0 272 kN, Pu 22.8 kN, grease limiting speed 3,700 r/min, oil 4,600 r/min, mass about 2110 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22216EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22216EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22216EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22216EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22216EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22216EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 267 kN C / 272 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22216EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22216EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22216emd1",
      "＊22216emd1",
      "22216EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22216EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22216EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 80,
    "D_mm": 140,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 267,
    "static_load_kN": 272,
    "fatigue_load_limit_kN": 22.8,
    "limiting_speed_rpm": 3700,
    "max_rpm": 3700,
    "speed_oil_rpm": 4600,
    "weight_g": 2070,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 22216EMKD1 denotes the 80 mm bore spherical roller bearing (267 kN C / 272 kN C0) in the 22200 series, the self-aligning choice for heavy combined load. Digit by digit the code reads as spherical-roller dimension series plus 80 mm bore; the 33 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. Pu 22.8 kN against C0 272 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22216EMKD1 moves with cleanliness far more than with small C variations. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22216EMKD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "Mount the 80 mm ring with induction heat or the sleeve drive-up procedure; at 2070 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 80 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22216EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22216EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Never substitute 22216EMKD1 by envelope alone: the 272 kN C0 and 22.8 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 267/272 kN ratings, 22.8 kN Pu and 2070 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22216EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22216EMKD1?",
        "a": "22216EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 80 mm bore, 140 mm OD and 33 mm width (3.15 × 5.512 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 267 kN, C0 272 kN, Pu 22.8 kN, grease limiting speed 3,700 r/min, oil 4,600 r/min, mass about 2070 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22216EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22216EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22216EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22216EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22216EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22216EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 267 kN C / 272 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22216EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22216EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22216emkd1",
      "＊22216emkd1",
      "22216EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21316-NTN",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21316",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 80,
    "D_mm": 170,
    "B_mm": 39,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 289,
    "static_load_kN": 315,
    "fatigue_load_limit_kN": 30.5,
    "limiting_speed_rpm": 2500,
    "max_rpm": 2500,
    "speed_oil_rpm": 3300,
    "weight_g": 4530,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 21316 identifies a 80×170×39 mm (3.15 × 6.693 × 1.535 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Numbering ties 21316 to its envelope and execution: same-number EA versus EM or plain variants share the 80 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. NTN prints two speeds for 21316: 2,500 r/min grease and 3,300 r/min oil — the gap of 800 r/min reflects oil cooling of the heavy roller set. Catalogue mass 4530 g (4.53 kg) for the 80×170×39 mm execution includes the C design-code cage and both roller rows; shaft and housing shoulders must support that ring squarely. Fillet radii on shaft and housing must clear the ring chamfers of the 39 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "Mount the 80 mm ring with induction heat or the sleeve drive-up procedure; at 4530 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 289 kN rating no longer applies.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 21316 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Do not confuse EA and EM at the same number: 21316 carries C design-code; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 80×170 mm envelope is identical.",
      "Oil relubrication toward 3,300 r/min needs drain and level design; flooding the 39 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 289/315 kN ratings, 30.5 kN Pu and 4530 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21316 (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21316?",
        "a": "21316 is an NTN double-row spherical roller bearing to ISO 15: 80 mm bore, 170 mm OD and 39 mm width (3.15 × 6.693 × 1.535 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 289 kN, C0 315 kN, Pu 30.5 kN, grease limiting speed 2,500 r/min, oil 3,300 r/min, mass about 4530 g. It is open, with pressed-steel cage of the 213-series C design."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "21316 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 21316K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21316 is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21316?",
        "a": "21316 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21316 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 289 kN C / 315 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21316",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "21316-EK",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "21316K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 21316K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21316",
      "21316-NTN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21316K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21316K",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 80,
    "D_mm": 170,
    "B_mm": 39,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 289,
    "static_load_kN": 315,
    "fatigue_load_limit_kN": 30.5,
    "limiting_speed_rpm": 2500,
    "max_rpm": 2500,
    "speed_oil_rpm": 3300,
    "weight_g": 4470,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 80 mm shaft, NTN supplies 21316K: sphered outer raceway, two roller rows, pressed-steel cage of the 213-series C design, oil speed 3,300 r/min. Reading the full code: the number gives the 80×170 mm envelope, C/CK names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the C design-code cage. 80 mm bore is 3.15 in and 170 mm OD is 6.693 in; the ISO 15 envelope swaps between brands, but the 289/315 kN ratings and cage design are NTN 2203E values. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Mount the 80 mm ring with induction heat or the sleeve drive-up procedure; at 4470 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Oil relubrication toward 3,300 r/min needs drain and level design; flooding the 39 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 39 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 21316K by envelope alone: the 315 kN C0 and 30.5 kN Pu are specific to the NTN C design-code execution, and vibrating duty depends heavily on cage identity.",
      "Never substitute 21316K by envelope alone: the 315 kN C0 and 30.5 kN Pu are specific to the NTN C design-code execution, and vibrating duty depends heavily on cage identity.",
      "The 289/315 kN ratings, 30.5 kN Pu and 4470 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21316K (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21316K?",
        "a": "21316K is an NTN double-row spherical roller bearing to ISO 15: 80 mm bore, 170 mm OD and 39 mm width (3.15 × 6.693 × 1.535 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 289 kN, C0 315 kN, Pu 30.5 kN, grease limiting speed 2,500 r/min, oil 3,300 r/min, mass about 4470 g. It is open, with pressed-steel cage of the 213-series C design and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 21316K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 21316."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21316K is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21316K?",
        "a": "21316K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21316K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 289 kN C / 315 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21316-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 21316-NTN — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21316k",
      "21316K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22316EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22316EAD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 80,
    "D_mm": 170,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 541,
    "static_load_kN": 522,
    "fatigue_load_limit_kN": 32.5,
    "limiting_speed_rpm": 2700,
    "max_rpm": 2700,
    "speed_oil_rpm": 3400,
    "weight_g": 6120,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22316EAD1 belongs to the 22300 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (22300 series); the bore code resolves to 80 mm (two-digit code ×5, with the 00–03 exception table), and 170 mm OD / 58 mm width follow the general plan. The 45.0 mm radial section over the 80 mm bore carries two roller rows; capacity per millimetre of bore is about 6.8 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Grease/oil ratio: the 2,700 r/min limiting value is .79 of the 3,400 r/min oil value; heavy 58 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Fillet radii on shaft and housing must clear the ring chamfers of the 58 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Mount the 80 mm ring with induction heat or the sleeve drive-up procedure; at 6120 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22316EAD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Never substitute 22316EAD1 by envelope alone: the 522 kN C0 and 32.5 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "Oil relubrication toward 3,400 r/min needs drain and level design; flooding the 58 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The cylindrical-bore 22316EAD1 and its tapered-bore counterpart 22316EAKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 541/522 kN ratings, 32.5 kN Pu and 6120 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22316EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22316EAD1?",
        "a": "22316EAD1 is an NTN double-row spherical roller bearing to ISO 15: 80 mm bore, 170 mm OD and 58 mm width (3.15 × 6.693 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 541 kN, C0 522 kN, Pu 32.5 kN, grease limiting speed 2,700 r/min, oil 3,400 r/min, mass about 6120 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22316EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22316EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22316EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22316EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22316EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22316EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 541 kN C / 522 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22316EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22316EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22316ead1",
      "＊22316ead1",
      "22316EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22316EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22316EAKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 80,
    "D_mm": 170,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 541,
    "static_load_kN": 522,
    "fatigue_load_limit_kN": 32.5,
    "limiting_speed_rpm": 2700,
    "max_rpm": 2700,
    "speed_oil_rpm": 3400,
    "weight_g": 5990,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22316EAKD1 belongs to the 22300 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. Digit by digit the code reads as spherical-roller dimension series plus 80 mm bore; the 58 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The 45.0 mm radial section over the 80 mm bore carries two roller rows; capacity per millimetre of bore is about 6.8 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Pu 32.5 kN against C0 522 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22316EAKD1 moves with cleanliness far more than with small C variations. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 80 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "Mount the 80 mm ring with induction heat or the sleeve drive-up procedure; at 5990 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22316EAKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22316EAD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 80 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22316EAD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 541/522 kN ratings, 32.5 kN Pu and 5990 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22316EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22316EAKD1?",
        "a": "22316EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 80 mm bore, 170 mm OD and 58 mm width (3.15 × 6.693 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 541 kN, C0 522 kN, Pu 32.5 kN, grease limiting speed 2,700 r/min, oil 3,400 r/min, mass about 5990 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22316EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22316EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22316EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22316EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22316EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22316EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 541 kN C / 522 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22316EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22316EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22316eakd1",
      "＊22316eakd1",
      "22316EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22316EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22316EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 80,
    "D_mm": 170,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 541,
    "static_load_kN": 522,
    "fatigue_load_limit_kN": 32.5,
    "limiting_speed_rpm": 2700,
    "max_rpm": 2700,
    "speed_oil_rpm": 3400,
    "weight_g": 6280,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 80 mm shaft, NTN supplies 22316EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 3,400 r/min. Digit by digit the code reads as spherical-roller dimension series plus 80 mm bore; the 58 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. At 541 kN C and 6280 g mass the 22300 series part is built for shock and vibration; the 58 mm-wide ring needs square abutments to keep both rows equally loaded. Grease/oil ratio: the 2,700 r/min limiting value is .79 of the 3,400 r/min oil value; heavy 58 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Mount the 80 mm ring with induction heat or the sleeve drive-up procedure; at 6280 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 80 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 80 mm bearing, and drive-up procedures differ.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,700 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,700 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 541/522 kN ratings, 32.5 kN Pu and 6280 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22316EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22316EMD1?",
        "a": "22316EMD1 is an NTN double-row spherical roller bearing to ISO 15: 80 mm bore, 170 mm OD and 58 mm width (3.15 × 6.693 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 541 kN, C0 522 kN, Pu 32.5 kN, grease limiting speed 2,700 r/min, oil 3,400 r/min, mass about 6280 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22316EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22316EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22316EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22316EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22316EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22316EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 541 kN C / 522 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22316EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22316EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22316emd1",
      "＊22316emd1",
      "22316EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22316EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22316EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 80,
    "D_mm": 170,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 541,
    "static_load_kN": 522,
    "fatigue_load_limit_kN": 32.5,
    "limiting_speed_rpm": 2700,
    "max_rpm": 2700,
    "speed_oil_rpm": 3400,
    "weight_g": 6150,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22316EMKD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 80 mm shaft — 541 kN basic dynamic capacity in a 6150 g, open ISO 15 envelope. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 22316EMKD1 is assembled exactly in that order. The 1:12 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 80 mm bore assembly. Speed planning: 2,700 r/min grease limiting speed is the cage/kinematic ceiling and 3,400 r/min is the oil-lubricated value for the 80 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "Mount the 80 mm ring with induction heat or the sleeve drive-up procedure; at 6150 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 541 kN rating no longer applies.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 541 kN rating no longer applies.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22316EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Do not confuse EA and EM at the same number: 22316EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 80×170 mm envelope is identical.",
      "The 541/522 kN ratings, 32.5 kN Pu and 6150 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22316EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22316EMKD1?",
        "a": "22316EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 80 mm bore, 170 mm OD and 58 mm width (3.15 × 6.693 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 541 kN, C0 522 kN, Pu 32.5 kN, grease limiting speed 2,700 r/min, oil 3,400 r/min, mass about 6150 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22316EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22316EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22316EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22316EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22316EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22316EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 541 kN C / 522 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22316EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22316EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22316emkd1",
      "＊22316emkd1",
      "22316EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22217EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22217EAD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 85,
    "D_mm": 150,
    "B_mm": 36,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 324,
    "static_load_kN": 330,
    "fatigue_load_limit_kN": 27.1,
    "limiting_speed_rpm": 3400,
    "max_rpm": 3400,
    "speed_oil_rpm": 4300,
    "weight_g": 2590,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22217EAD1 belongs to the 22200 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. Numbering ties 22217EAD1 to its envelope and execution: same-number EA versus EM or plain variants share the 85 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. NTN prints two speeds for 22217EAD1: 3,400 r/min grease and 4,300 r/min oil — the gap of 900 r/min reflects oil cooling of the heavy roller set. Catalogue mass 2590 g (2.59 kg) for the 85×150×36 mm execution includes the EA pressed-steel-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Fillet radii on shaft and housing must clear the ring chamfers of the 36 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Mount the 85 mm ring with induction heat or the sleeve drive-up procedure; at 2590 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 85 mm bearing, and drive-up procedures differ.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 3,400 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 3,400 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Oil relubrication toward 4,300 r/min needs drain and level design; flooding the 36 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 324/330 kN ratings, 27.1 kN Pu and 2590 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22217EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22217EAD1?",
        "a": "22217EAD1 is an NTN double-row spherical roller bearing to ISO 15: 85 mm bore, 150 mm OD and 36 mm width (3.346 × 5.906 × 1.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 324 kN, C0 330 kN, Pu 27.1 kN, grease limiting speed 3,400 r/min, oil 4,300 r/min, mass about 2590 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22217EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22217EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22217EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22217EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22217EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22217EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 324 kN C / 330 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22217EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22217EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22217ead1",
      "＊22217ead1",
      "22217EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22217EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22217EAKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 85,
    "D_mm": 150,
    "B_mm": 36,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 324,
    "static_load_kN": 330,
    "fatigue_load_limit_kN": 27.1,
    "limiting_speed_rpm": 3400,
    "max_rpm": 3400,
    "speed_oil_rpm": 4300,
    "weight_g": 2540,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 85 mm shaft, NTN supplies 22217EAKD1: sphered outer raceway, two roller rows, pressed sheet-steel window cage (EA high-capacity design), oil speed 4,300 r/min. Digit by digit the code reads as spherical-roller dimension series plus 85 mm bore; the 36 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Speed planning: 3,400 r/min grease limiting speed is the cage/kinematic ceiling and 4,300 r/min is the oil-lubricated value for the 85 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Mount the 85 mm ring with induction heat or the sleeve drive-up procedure; at 2540 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22217EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Never substitute 22217EAKD1 by envelope alone: the 330 kN C0 and 27.1 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22217EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 85 mm bearing, and drive-up procedures differ.",
      "The 324/330 kN ratings, 27.1 kN Pu and 2540 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22217EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22217EAKD1?",
        "a": "22217EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 85 mm bore, 150 mm OD and 36 mm width (3.346 × 5.906 × 1.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 324 kN, C0 330 kN, Pu 27.1 kN, grease limiting speed 3,400 r/min, oil 4,300 r/min, mass about 2540 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22217EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22217EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22217EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22217EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22217EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22217EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 324 kN C / 330 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22217EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22217EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22217eakd1",
      "＊22217eakd1",
      "22217EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22217EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22217EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 85,
    "D_mm": 150,
    "B_mm": 36,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 324,
    "static_load_kN": 330,
    "fatigue_load_limit_kN": 27.1,
    "limiting_speed_rpm": 3400,
    "max_rpm": 3400,
    "speed_oil_rpm": 4300,
    "weight_g": 2670,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 85 mm shaft, NTN supplies 22217EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 4,300 r/min. The leading digits are the ISO 15 dimension series (22200 series); the bore code resolves to 85 mm (two-digit code ×5, with the 00–03 exception table), and 150 mm OD / 36 mm width follow the general plan. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. Catalogue mass 2670 g (2.67 kg) for the 85×150×36 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Mount the 85 mm ring with induction heat or the sleeve drive-up procedure; at 2670 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22217EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22217EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 85 mm bearing, and drive-up procedures differ.",
      "Never substitute 22217EMD1 by envelope alone: the 330 kN C0 and 27.1 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 324/330 kN ratings, 27.1 kN Pu and 2670 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22217EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22217EMD1?",
        "a": "22217EMD1 is an NTN double-row spherical roller bearing to ISO 15: 85 mm bore, 150 mm OD and 36 mm width (3.346 × 5.906 × 1.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 324 kN, C0 330 kN, Pu 27.1 kN, grease limiting speed 3,400 r/min, oil 4,300 r/min, mass about 2670 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22217EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22217EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22217EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22217EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22217EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22217EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 324 kN C / 330 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22217EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22217EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22217emd1",
      "＊22217emd1",
      "22217EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22217EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22217EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 85,
    "D_mm": 150,
    "B_mm": 36,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 324,
    "static_load_kN": 330,
    "fatigue_load_limit_kN": 27.1,
    "limiting_speed_rpm": 3400,
    "max_rpm": 3400,
    "speed_oil_rpm": 4300,
    "weight_g": 2620,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 22217EMKD1 denotes the 85 mm bore spherical roller bearing (324 kN C / 330 kN C0) in the 22200 series, the self-aligning choice for heavy combined load. Numbering ties 22217EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 85 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Pu 27.1 kN is the catalogue fatigue load limit for 22217EMKD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Pu 27.1 kN against C0 330 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22217EMKD1 moves with cleanliness far more than with small C variations. Never mount 22217EMKD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 150 mm race.",
    "applications": [
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Mount the 85 mm ring with induction heat or the sleeve drive-up procedure; at 2620 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 324 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 85 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22217EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22217EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 324/330 kN ratings, 27.1 kN Pu and 2620 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22217EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22217EMKD1?",
        "a": "22217EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 85 mm bore, 150 mm OD and 36 mm width (3.346 × 5.906 × 1.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 324 kN, C0 330 kN, Pu 27.1 kN, grease limiting speed 3,400 r/min, oil 4,300 r/min, mass about 2620 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22217EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22217EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22217EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22217EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22217EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22217EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 324 kN C / 330 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22217EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22217EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22217emkd1",
      "＊22217emkd1",
      "22217EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21317-NTN",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21317",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 85,
    "D_mm": 180,
    "B_mm": 41,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 320,
    "static_load_kN": 355,
    "fatigue_load_limit_kN": 45,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 3100,
    "weight_g": 5350,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 85 mm shaft, NTN supplies 21317: sphered outer raceway, two roller rows, pressed-steel cage of the 213-series C design, oil speed 3,100 r/min. The leading digits are the ISO 15 dimension series (21300 series); the bore code resolves to 85 mm (two-digit code ×5, with the 00–03 exception table), and 180 mm OD / 41 mm width follow the general plan. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Pu 45 kN against C0 355 kN anchors the contamination derating; for dirty mining duty the adjusted life of 21317 moves with cleanliness far more than with small C variations. Fit the cylindrical-bore 21317 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Mount the 85 mm ring with induction heat or the sleeve drive-up procedure; at 5350 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 85 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 85 mm bearing, and drive-up procedures differ.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 85 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 85 mm bearing, and drive-up procedures differ.",
      "The 320/355 kN ratings, 45 kN Pu and 5350 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21317 (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21317?",
        "a": "21317 is an NTN double-row spherical roller bearing to ISO 15: 85 mm bore, 180 mm OD and 41 mm width (3.346 × 7.087 × 1.614 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 320 kN, C0 355 kN, Pu 45 kN, grease limiting speed 2,400 r/min, oil 3,100 r/min, mass about 5350 g. It is open, with pressed-steel cage of the 213-series C design."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "21317 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 21317K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21317 is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21317?",
        "a": "21317 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21317 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 320 kN C / 355 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21317",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "21317-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "21317K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 21317K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21317",
      "21317-NTN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21317K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21317K",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 85,
    "D_mm": 180,
    "B_mm": 41,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 320,
    "static_load_kN": 355,
    "fatigue_load_limit_kN": 45,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 3100,
    "weight_g": 5280,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "21317K is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 85×180×41 mm to ISO 15, with pressed-steel cage of the 213-series C design. On the NTN nameplate the suffix cluster after the size reads in order: cage design (C/CK), bore (K), lubrication feature (none); 21317K is assembled exactly in that order. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Grease/oil ratio: the 2,400 r/min limiting value is .77 of the 3,100 r/min oil value; heavy 41 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Fillet radii on shaft and housing must clear the ring chamfers of the 41 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Mount the 85 mm ring with induction heat or the sleeve drive-up procedure; at 5280 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 41 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 21317K by envelope alone: the 355 kN C0 and 45 kN Pu are specific to the NTN C design-code execution, and vibrating duty depends heavily on cage identity.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 320 kN rating no longer applies.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 21317K on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 320/355 kN ratings, 45 kN Pu and 5280 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21317K (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21317K?",
        "a": "21317K is an NTN double-row spherical roller bearing to ISO 15: 85 mm bore, 180 mm OD and 41 mm width (3.346 × 7.087 × 1.614 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 320 kN, C0 355 kN, Pu 45 kN, grease limiting speed 2,400 r/min, oil 3,100 r/min, mass about 5280 g. It is open, with pressed-steel cage of the 213-series C design and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 21317K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 21317."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21317K is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21317K?",
        "a": "21317K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21317K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 320 kN C / 355 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21317-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 21317-NTN — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21317k",
      "21317K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22317EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22317EAD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 85,
    "D_mm": 180,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 599,
    "static_load_kN": 604,
    "fatigue_load_limit_kN": 36.4,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3200,
    "weight_g": 7180,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22317EAD1 identifies a 85×180×60 mm (3.346 × 7.087 × 2.362 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 85 mm bore; the 60 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Pu 36.4 kN is the catalogue fatigue load limit for 22317EAD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. 85 mm bore is 3.346 in and 180 mm OD is 7.087 in; the ISO 15 envelope swaps between brands, but the 599/604 kN ratings and cage design are NTN 2203E values. Fit the cylindrical-bore 22317EAD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "Mount the 85 mm ring with induction heat or the sleeve drive-up procedure; at 7180 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22317EAD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 599 kN rating no longer applies.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 60 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22317EAD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 599/604 kN ratings, 36.4 kN Pu and 7180 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22317EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22317EAD1?",
        "a": "22317EAD1 is an NTN double-row spherical roller bearing to ISO 15: 85 mm bore, 180 mm OD and 60 mm width (3.346 × 7.087 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 599 kN, C0 604 kN, Pu 36.4 kN, grease limiting speed 2,600 r/min, oil 3,200 r/min, mass about 7180 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22317EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22317EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22317EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22317EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22317EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22317EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 599 kN C / 604 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22317EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22317EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22317ead1",
      "＊22317ead1",
      "22317EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22317EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22317EAKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 85,
    "D_mm": 180,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 599,
    "static_load_kN": 604,
    "fatigue_load_limit_kN": 36.4,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3200,
    "weight_g": 7040,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22317EAKD1 belongs to the 22300 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (K), lubrication feature (D1); 22317EAKD1 is assembled exactly in that order. Two symmetric roller rows share the load: C 599 kN, C0 604 kN (C0/C ≈ 1.01), with useful axial capacity in either direction alongside the dominant radial load. Selection: the C0/C ratio of 1.01 (604/599 kN) reflects the heavy static and shock proportioning of 22317EAKD1; size the equivalent load at the required L10 with shock factor for the application. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 85 mm set.",
    "applications": [
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Mount the 85 mm ring with induction heat or the sleeve drive-up procedure; at 7040 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 85 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Do not confuse EA and EM at the same number: 22317EAKD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 85×180 mm envelope is identical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22317EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 85 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 599/604 kN ratings, 36.4 kN Pu and 7040 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22317EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22317EAKD1?",
        "a": "22317EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 85 mm bore, 180 mm OD and 60 mm width (3.346 × 7.087 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 599 kN, C0 604 kN, Pu 36.4 kN, grease limiting speed 2,600 r/min, oil 3,200 r/min, mass about 7040 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22317EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22317EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22317EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22317EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22317EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22317EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 599 kN C / 604 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22317EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22317EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22317eakd1",
      "＊22317eakd1",
      "22317EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22317EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22317EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 85,
    "D_mm": 180,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 599,
    "static_load_kN": 604,
    "fatigue_load_limit_kN": 36.4,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3200,
    "weight_g": 7290,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22317EMD1 identifies a 85×180×60 mm (3.346 × 7.087 × 2.362 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Reading the full code: the number gives the 85×180 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. 85 mm bore is 3.346 in and 180 mm OD is 7.087 in; the ISO 15 envelope swaps between brands, but the 599/604 kN ratings and cage design are NTN 2203E values. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Mount the 85 mm ring with induction heat or the sleeve drive-up procedure; at 7290 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22317EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Never substitute 22317EMD1 by envelope alone: the 604 kN C0 and 36.4 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22317EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 85 mm bearing, and drive-up procedures differ.",
      "The 599/604 kN ratings, 36.4 kN Pu and 7290 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22317EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22317EMD1?",
        "a": "22317EMD1 is an NTN double-row spherical roller bearing to ISO 15: 85 mm bore, 180 mm OD and 60 mm width (3.346 × 7.087 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 599 kN, C0 604 kN, Pu 36.4 kN, grease limiting speed 2,600 r/min, oil 3,200 r/min, mass about 7290 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22317EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22317EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22317EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22317EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22317EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22317EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 599 kN C / 604 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22317EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22317EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22317emd1",
      "＊22317emd1",
      "22317EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22317EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22317EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 85,
    "D_mm": 180,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 599,
    "static_load_kN": 604,
    "fatigue_load_limit_kN": 36.4,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3200,
    "weight_g": 7150,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22317EMKD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 85 mm shaft — 599 kN basic dynamic capacity in a 7150 g, open ISO 15 envelope. The leading digits are the ISO 15 dimension series (22300 series); the bore code resolves to 85 mm (two-digit code ×5, with the 00–03 exception table), and 180 mm OD / 60 mm width follow the general plan. Open by design, 22317EMKD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Selection: the C0/C ratio of 1.01 (604/599 kN) reflects the heavy static and shock proportioning of 22317EMKD1; size the equivalent load at the required L10 with shock factor for the application. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 85 mm set.",
    "applications": [
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "Mount the 85 mm ring with induction heat or the sleeve drive-up procedure; at 7150 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Never substitute 22317EMKD1 by envelope alone: the 604 kN C0 and 36.4 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Never substitute 22317EMKD1 by envelope alone: the 604 kN C0 and 36.4 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 60 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 599 kN rating no longer applies.",
      "The 599/604 kN ratings, 36.4 kN Pu and 7150 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22317EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22317EMKD1?",
        "a": "22317EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 85 mm bore, 180 mm OD and 60 mm width (3.346 × 7.087 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 599 kN, C0 604 kN, Pu 36.4 kN, grease limiting speed 2,600 r/min, oil 3,200 r/min, mass about 7150 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22317EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22317EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22317EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22317EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22317EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22317EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 599 kN C / 604 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22317EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22317EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22317emkd1",
      "＊22317emkd1",
      "22317EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22218EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22218EAD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 90,
    "D_mm": 160,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 384,
    "static_load_kN": 398,
    "fatigue_load_limit_kN": 30.2,
    "limiting_speed_rpm": 3200,
    "max_rpm": 3200,
    "speed_oil_rpm": 4000,
    "weight_g": 3340,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22218EAD1 identifies a 90×160×40 mm (3.543 × 6.299 × 1.575 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 90 mm bore; the 40 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. With about 4.3 kN of C per millimetre of the 90 mm bore, 22218EAD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Fit the cylindrical-bore 22218EAD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Mount the 90 mm ring with induction heat or the sleeve drive-up procedure; at 3340 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Do not confuse EA and EM at the same number: 22218EAD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 90×160 mm envelope is identical.",
      "Never substitute 22218EAD1 by envelope alone: the 398 kN C0 and 30.2 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22218EAD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 90 mm bearing, and drive-up procedures differ.",
      "The 384/398 kN ratings, 30.2 kN Pu and 3340 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22218EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22218EAD1?",
        "a": "22218EAD1 is an NTN double-row spherical roller bearing to ISO 15: 90 mm bore, 160 mm OD and 40 mm width (3.543 × 6.299 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 384 kN, C0 398 kN, Pu 30.2 kN, grease limiting speed 3,200 r/min, oil 4,000 r/min, mass about 3340 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22218EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22218EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22218EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22218EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22218EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22218EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 384 kN C / 398 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22218EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22218EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22218ead1",
      "＊22218ead1",
      "22218EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22218EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22218EAKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 90,
    "D_mm": 160,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 384,
    "static_load_kN": 398,
    "fatigue_load_limit_kN": 30.2,
    "limiting_speed_rpm": 3200,
    "max_rpm": 3200,
    "speed_oil_rpm": 4000,
    "weight_g": 3270,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 90 mm shaft, NTN supplies 22218EAKD1: sphered outer raceway, two roller rows, pressed sheet-steel window cage (EA high-capacity design), oil speed 4,000 r/min. Numbering ties 22218EAKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 90 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The 35.0 mm radial section over the 90 mm bore carries two roller rows; capacity per millimetre of bore is about 4.3 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Speed planning: 3,200 r/min grease limiting speed is the cage/kinematic ceiling and 4,000 r/min is the oil-lubricated value for the 90 mm bore; vibrating screens rarely approach either and are load/cage limited instead. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22218EAKD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Mount the 90 mm ring with induction heat or the sleeve drive-up procedure; at 3270 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 90 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 3,200 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22218EAKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22218EAD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 384/398 kN ratings, 30.2 kN Pu and 3270 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22218EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22218EAKD1?",
        "a": "22218EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 90 mm bore, 160 mm OD and 40 mm width (3.543 × 6.299 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 384 kN, C0 398 kN, Pu 30.2 kN, grease limiting speed 3,200 r/min, oil 4,000 r/min, mass about 3270 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22218EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22218EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22218EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22218EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22218EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22218EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 384 kN C / 398 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22218EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22218EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22218eakd1",
      "＊22218eakd1",
      "22218EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22218EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22218EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 90,
    "D_mm": 160,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 384,
    "static_load_kN": 398,
    "fatigue_load_limit_kN": 30.2,
    "limiting_speed_rpm": 3200,
    "max_rpm": 3200,
    "speed_oil_rpm": 4000,
    "weight_g": 3430,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22218EMD1 identifies a 90×160×40 mm (3.543 × 6.299 × 1.575 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 90 mm bore; the 40 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The cylindrical bore fits a machined 90 mm shaft seat directly; the same envelope in 22218EMKD1 (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Pu 30.2 kN against C0 398 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22218EMD1 moves with cleanliness far more than with small C variations. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "Mount the 90 mm ring with induction heat or the sleeve drive-up procedure; at 3430 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 90 mm bearing, and drive-up procedures differ.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 3,200 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Oil relubrication toward 4,000 r/min needs drain and level design; flooding the 40 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Do not confuse EA and EM at the same number: 22218EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 90×160 mm envelope is identical.",
      "The 384/398 kN ratings, 30.2 kN Pu and 3430 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22218EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22218EMD1?",
        "a": "22218EMD1 is an NTN double-row spherical roller bearing to ISO 15: 90 mm bore, 160 mm OD and 40 mm width (3.543 × 6.299 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 384 kN, C0 398 kN, Pu 30.2 kN, grease limiting speed 3,200 r/min, oil 4,000 r/min, mass about 3430 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22218EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22218EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22218EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22218EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22218EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22218EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 384 kN C / 398 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22218EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22218EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22218emd1",
      "＊22218emd1",
      "22218EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22218EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22218EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 90,
    "D_mm": 160,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 384,
    "static_load_kN": 398,
    "fatigue_load_limit_kN": 30.2,
    "limiting_speed_rpm": 3200,
    "max_rpm": 3200,
    "speed_oil_rpm": 4000,
    "weight_g": 3370,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 22218EMKD1 denotes the 90 mm bore spherical roller bearing (384 kN C / 398 kN C0) in the 22200 series, the self-aligning choice for heavy combined load. Digit by digit the code reads as spherical-roller dimension series plus 90 mm bore; the 40 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. At 384 kN C and 3370 g mass the 22200 series part is built for shock and vibration; the 40 mm-wide ring needs square abutments to keep both rows equally loaded. Speed planning: 3,200 r/min grease limiting speed is the cage/kinematic ceiling and 4,000 r/min is the oil-lubricated value for the 90 mm bore; vibrating screens rarely approach either and are load/cage limited instead. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22218EMKD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "Mount the 90 mm ring with induction heat or the sleeve drive-up procedure; at 3370 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Never substitute 22218EMKD1 by envelope alone: the 398 kN C0 and 30.2 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Oil relubrication toward 4,000 r/min needs drain and level design; flooding the 40 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Do not confuse EA and EM at the same number: 22218EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 90×160 mm envelope is identical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 3,200 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 384/398 kN ratings, 30.2 kN Pu and 3370 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22218EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22218EMKD1?",
        "a": "22218EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 90 mm bore, 160 mm OD and 40 mm width (3.543 × 6.299 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 384 kN, C0 398 kN, Pu 30.2 kN, grease limiting speed 3,200 r/min, oil 4,000 r/min, mass about 3370 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22218EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22218EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22218EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22218EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22218EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22218EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 384 kN C / 398 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22218EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22218EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22218emkd1",
      "＊22218emkd1",
      "22218EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23218EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23218EMD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 90,
    "D_mm": 160,
    "B_mm": 52.4,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 467,
    "static_load_kN": 513,
    "fatigue_load_limit_kN": 30,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3200,
    "weight_g": 4430,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23218EMD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 90×160×52.4 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 23218EMD1 is assembled exactly in that order. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Speed planning: 2,600 r/min grease limiting speed is the cage/kinematic ceiling and 3,200 r/min is the oil-lubricated value for the 90 mm bore; vibrating screens rarely approach either and are load/cage limited instead. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 90 mm set.",
    "applications": [
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "Mount the 90 mm ring with induction heat or the sleeve drive-up procedure; at 4430 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23218EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 90 mm bearing, and drive-up procedures differ.",
      "Oil relubrication toward 3,200 r/min needs drain and level design; flooding the 52.4 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23218EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 467/513 kN ratings, 30 kN Pu and 4430 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23218EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23218EMD1?",
        "a": "23218EMD1 is an NTN double-row spherical roller bearing to ISO 15: 90 mm bore, 160 mm OD and 52.4 mm width (3.543 × 6.299 × 2.063 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 467 kN, C0 513 kN, Pu 30 kN, grease limiting speed 2,600 r/min, oil 3,200 r/min, mass about 4430 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23218EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23218EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23218EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23218EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23218EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23218EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 467 kN C / 513 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23218EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23218EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23218emd1",
      "＊23218emd1",
      "23218EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23218EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23218EMKD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 90,
    "D_mm": 160,
    "B_mm": 52.4,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 467,
    "static_load_kN": 513,
    "fatigue_load_limit_kN": 30,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3200,
    "weight_g": 4310,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23218EMKD1 denotes the 90 mm bore spherical roller bearing (467 kN C / 513 kN C0) in the 23200 series, the self-aligning choice for heavy combined load. Numbering ties 23218EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 90 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Speed planning: 2,600 r/min grease limiting speed is the cage/kinematic ceiling and 3,200 r/min is the oil-lubricated value for the 90 mm bore; vibrating screens rarely approach either and are load/cage limited instead. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 23218EMKD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Mount the 90 mm ring with induction heat or the sleeve drive-up procedure; at 4310 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 467 kN rating no longer applies.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,600 r/min grease rating is lost to abrasive wear long before fatigue.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 90 mm bearing, and drive-up procedures differ.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23218EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 467/513 kN ratings, 30 kN Pu and 4310 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23218EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23218EMKD1?",
        "a": "23218EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 90 mm bore, 160 mm OD and 52.4 mm width (3.543 × 6.299 × 2.063 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 467 kN, C0 513 kN, Pu 30 kN, grease limiting speed 2,600 r/min, oil 3,200 r/min, mass about 4310 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23218EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23218EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23218EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23218EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23218EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23218EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 467 kN C / 513 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23218EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23218EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23218emkd1",
      "＊23218emkd1",
      "23218EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21318-NTN",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21318",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 90,
    "D_mm": 190,
    "B_mm": 43,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 355,
    "static_load_kN": 400,
    "fatigue_load_limit_kN": 50.5,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 3000,
    "weight_g": 6300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 21318 identifies a 90×190×43 mm (3.543 × 7.48 × 1.693 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Reading the full code: the number gives the 90×190 mm envelope, C/CK names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and plain outer ring (no D1/W33 groove) completes the order number. Two symmetric roller rows share the load: C 355 kN, C0 400 kN (C0/C ≈ 1.13), with useful axial capacity in either direction alongside the dominant radial load. Catalogue mass 6300 g (6.30 kg) for the 90×190×43 mm execution includes the C design-code cage and both roller rows; shaft and housing shoulders must support that ring squarely. Fit the cylindrical-bore 21318 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "Mount the 90 mm ring with induction heat or the sleeve drive-up procedure; at 6300 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 21318 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Never substitute 21318 by envelope alone: the 400 kN C0 and 50.5 kN Pu are specific to the NTN C design-code execution, and vibrating duty depends heavily on cage identity.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,300 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 90 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 355/400 kN ratings, 50.5 kN Pu and 6300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21318 (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21318?",
        "a": "21318 is an NTN double-row spherical roller bearing to ISO 15: 90 mm bore, 190 mm OD and 43 mm width (3.543 × 7.48 × 1.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 355 kN, C0 400 kN, Pu 50.5 kN, grease limiting speed 2,300 r/min, oil 3,000 r/min, mass about 6300 g. It is open, with pressed-steel cage of the 213-series C design."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "21318 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 21318K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21318 is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21318?",
        "a": "21318 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21318 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 355 kN C / 400 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21318",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "21318-EK",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "21318K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 21318K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21318",
      "21318-NTN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21318K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21318K",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 90,
    "D_mm": 190,
    "B_mm": 43,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 355,
    "static_load_kN": 400,
    "fatigue_load_limit_kN": 50.5,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 3000,
    "weight_g": 6210,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "21318K is the C design-code execution of NTN's spherical roller range for a 90 mm shaft — 355 kN basic dynamic capacity in a 6210 g, open ISO 15 envelope. Numbering ties 21318K to its envelope and execution: same-number EA versus EM or plain variants share the 90 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The 50.0 mm radial section over the 90 mm bore carries two roller rows; capacity per millimetre of bore is about 3.9 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Equivalent-load planning keeps a radial plus moderate axial combination on 21318K; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 90 mm set.",
    "applications": [
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "Mount the 90 mm ring with induction heat or the sleeve drive-up procedure; at 6210 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 355 kN rating no longer applies.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 21318K in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 21318K in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "213-series C/CK executions use the C cage/design code — CK adds the 1:12 tapered bore; quote 21318K in full because a C cannot be mounted on an adapter-sleeve tapered seat.",
      "The 355/400 kN ratings, 50.5 kN Pu and 6210 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21318K (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21318K?",
        "a": "21318K is an NTN double-row spherical roller bearing to ISO 15: 90 mm bore, 190 mm OD and 43 mm width (3.543 × 7.48 × 1.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 355 kN, C0 400 kN, Pu 50.5 kN, grease limiting speed 2,300 r/min, oil 3,000 r/min, mass about 6210 g. It is open, with pressed-steel cage of the 213-series C design and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 21318K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 21318."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21318K is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21318K?",
        "a": "21318K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21318K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 355 kN C / 400 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21318-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 21318-NTN — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21318k",
      "21318K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22318EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22318EAD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 90,
    "D_mm": 190,
    "B_mm": 64,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 668,
    "static_load_kN": 652,
    "fatigue_load_limit_kN": 40,
    "limiting_speed_rpm": 2500,
    "max_rpm": 2500,
    "speed_oil_rpm": 3000,
    "weight_g": 8420,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22318EAD1 belongs to the 22300 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (cylindrical), lubrication feature (D1); 22318EAD1 is assembled exactly in that order. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EA pressed-steel-cage cage. 90 mm bore is 3.543 in and 190 mm OD is 7.48 in; the ISO 15 envelope swaps between brands, but the 668/652 kN ratings and cage design are NTN 2203E values. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 90 mm set.",
    "applications": [
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "Mount the 90 mm ring with induction heat or the sleeve drive-up procedure; at 8420 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 64 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 64 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 22318EAD1 by envelope alone: the 652 kN C0 and 40 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "Never substitute 22318EAD1 by envelope alone: the 652 kN C0 and 40 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 668/652 kN ratings, 40 kN Pu and 8420 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22318EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22318EAD1?",
        "a": "22318EAD1 is an NTN double-row spherical roller bearing to ISO 15: 90 mm bore, 190 mm OD and 64 mm width (3.543 × 7.48 × 2.52 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 668 kN, C0 652 kN, Pu 40 kN, grease limiting speed 2,500 r/min, oil 3,000 r/min, mass about 8420 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22318EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22318EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22318EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22318EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22318EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22318EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 668 kN C / 652 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22318EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22318EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22318ead1",
      "＊22318ead1",
      "22318EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22318EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22318EAKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 90,
    "D_mm": 190,
    "B_mm": 64,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 668,
    "static_load_kN": 652,
    "fatigue_load_limit_kN": 40,
    "limiting_speed_rpm": 2500,
    "max_rpm": 2500,
    "speed_oil_rpm": 3000,
    "weight_g": 8250,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22318EAKD1 belongs to the 22300 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. Digit by digit the code reads as spherical-roller dimension series plus 90 mm bore; the 64 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The 1:12 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 90 mm bore assembly. Speed planning: 2,500 r/min grease limiting speed is the cage/kinematic ceiling and 3,000 r/min is the oil-lubricated value for the 90 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 90 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "Mount the 90 mm ring with induction heat or the sleeve drive-up procedure; at 8250 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 668 kN rating no longer applies.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 90 mm bearing, and drive-up procedures differ.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 64 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Do not confuse EA and EM at the same number: 22318EAKD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 90×190 mm envelope is identical.",
      "The 668/652 kN ratings, 40 kN Pu and 8250 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22318EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22318EAKD1?",
        "a": "22318EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 90 mm bore, 190 mm OD and 64 mm width (3.543 × 7.48 × 2.52 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 668 kN, C0 652 kN, Pu 40 kN, grease limiting speed 2,500 r/min, oil 3,000 r/min, mass about 8250 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22318EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22318EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22318EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22318EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22318EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22318EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 668 kN C / 652 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22318EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22318EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22318eakd1",
      "＊22318eakd1",
      "22318EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22318EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22318EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 90,
    "D_mm": 190,
    "B_mm": 64,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 668,
    "static_load_kN": 652,
    "fatigue_load_limit_kN": 40,
    "limiting_speed_rpm": 2500,
    "max_rpm": 2500,
    "speed_oil_rpm": 3000,
    "weight_g": 8530,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 90 mm shaft, NTN supplies 22318EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 3,000 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 22318EMD1 is assembled exactly in that order. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. With about 7.4 kN of C per millimetre of the 90 mm bore, 22318EMD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22318EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "Mount the 90 mm ring with induction heat or the sleeve drive-up procedure; at 8530 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22318EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 668 kN rating no longer applies.",
      "The cylindrical-bore 22318EMD1 and its tapered-bore counterpart 22318EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Never substitute 22318EMD1 by envelope alone: the 652 kN C0 and 40 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 668/652 kN ratings, 40 kN Pu and 8530 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22318EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22318EMD1?",
        "a": "22318EMD1 is an NTN double-row spherical roller bearing to ISO 15: 90 mm bore, 190 mm OD and 64 mm width (3.543 × 7.48 × 2.52 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 668 kN, C0 652 kN, Pu 40 kN, grease limiting speed 2,500 r/min, oil 3,000 r/min, mass about 8530 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22318EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22318EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22318EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22318EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22318EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22318EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 668 kN C / 652 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22318EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22318EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22318emd1",
      "＊22318emd1",
      "22318EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22318EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22318EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 90,
    "D_mm": 190,
    "B_mm": 64,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 668,
    "static_load_kN": 652,
    "fatigue_load_limit_kN": 40,
    "limiting_speed_rpm": 2500,
    "max_rpm": 2500,
    "speed_oil_rpm": 3000,
    "weight_g": 8350,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22318EMKD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 90 mm shaft — 668 kN basic dynamic capacity in a 8350 g, open ISO 15 envelope. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 22318EMKD1 is assembled exactly in that order. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Selection: the C0/C ratio of 0.98 (652/668 kN) reflects the heavy static and shock proportioning of 22318EMKD1; size the equivalent load at the required L10 with shock factor for the application. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "Mount the 90 mm ring with induction heat or the sleeve drive-up procedure; at 8350 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22318EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,500 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Do not confuse EA and EM at the same number: 22318EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 90×190 mm envelope is identical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 90 mm bearing, and drive-up procedures differ.",
      "The 668/652 kN ratings, 40 kN Pu and 8350 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22318EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22318EMKD1?",
        "a": "22318EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 90 mm bore, 190 mm OD and 64 mm width (3.543 × 7.48 × 2.52 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 668 kN, C0 652 kN, Pu 40 kN, grease limiting speed 2,500 r/min, oil 3,000 r/min, mass about 8350 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22318EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22318EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22318EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22318EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22318EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22318EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 668 kN C / 652 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22318EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22318EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22318emkd1",
      "＊22318emkd1",
      "22318EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22219EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22219EAD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 95,
    "D_mm": 170,
    "B_mm": 43,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 416,
    "static_load_kN": 417,
    "fatigue_load_limit_kN": 33.4,
    "limiting_speed_rpm": 3000,
    "max_rpm": 3000,
    "speed_oil_rpm": 3800,
    "weight_g": 3980,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22219EAD1 belongs to the 22200 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. Reading the full code: the number gives the 95×170 mm envelope, EA names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. Two symmetric roller rows share the load: C 416 kN, C0 417 kN (C0/C ≈ 1.00), with useful axial capacity in either direction alongside the dominant radial load. Catalogue mass 3980 g (3.98 kg) for the 95×170×43 mm execution includes the EA pressed-steel-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Fit the cylindrical-bore 22219EAD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Mount the 95 mm ring with induction heat or the sleeve drive-up procedure; at 3980 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 3,000 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22219EAD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The cylindrical-bore 22219EAD1 and its tapered-bore counterpart 22219EAKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 95 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 416/417 kN ratings, 33.4 kN Pu and 3980 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22219EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22219EAD1?",
        "a": "22219EAD1 is an NTN double-row spherical roller bearing to ISO 15: 95 mm bore, 170 mm OD and 43 mm width (3.74 × 6.693 × 1.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 416 kN, C0 417 kN, Pu 33.4 kN, grease limiting speed 3,000 r/min, oil 3,800 r/min, mass about 3980 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22219EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22219EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22219EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22219EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22219EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22219EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 416 kN C / 417 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22219EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22219EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22219ead1",
      "＊22219ead1",
      "22219EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22219EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22219EAKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 95,
    "D_mm": 170,
    "B_mm": 43,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 416,
    "static_load_kN": 417,
    "fatigue_load_limit_kN": 33.4,
    "limiting_speed_rpm": 3000,
    "max_rpm": 3000,
    "speed_oil_rpm": 3800,
    "weight_g": 3900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22219EAKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 95 mm bore, 170 mm OD, 43 mm width, rated 3,000 r/min on grease. Digit by digit the code reads as spherical-roller dimension series plus 95 mm bore; the 43 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EA pressed-steel-cage cage. The 37.5 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 43 mm-wide ring seats fully on both sides. Fillet radii on shaft and housing must clear the ring chamfers of the 43 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "Mount the 95 mm ring with induction heat or the sleeve drive-up procedure; at 3900 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Oil relubrication toward 3,800 r/min needs drain and level design; flooding the 43 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22219EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 95 mm bearing, and drive-up procedures differ.",
      "Never substitute 22219EAKD1 by envelope alone: the 417 kN C0 and 33.4 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 416/417 kN ratings, 33.4 kN Pu and 3900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22219EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22219EAKD1?",
        "a": "22219EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 95 mm bore, 170 mm OD and 43 mm width (3.74 × 6.693 × 1.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 416 kN, C0 417 kN, Pu 33.4 kN, grease limiting speed 3,000 r/min, oil 3,800 r/min, mass about 3900 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22219EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22219EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22219EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22219EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22219EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22219EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 416 kN C / 417 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22219EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22219EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22219eakd1",
      "＊22219eakd1",
      "22219EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22219EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22219EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 95,
    "D_mm": 170,
    "B_mm": 43,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 416,
    "static_load_kN": 417,
    "fatigue_load_limit_kN": 33.4,
    "limiting_speed_rpm": 3000,
    "max_rpm": 3000,
    "speed_oil_rpm": 3800,
    "weight_g": 4060,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 95 mm shaft, NTN supplies 22219EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 3,800 r/min. Reading the full code: the number gives the 95×170 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. Open by design, 22219EMD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Speed planning: 3,000 r/min grease limiting speed is the cage/kinematic ceiling and 3,800 r/min is the oil-lubricated value for the 95 mm bore; vibrating screens rarely approach either and are load/cage limited instead. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22219EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Mount the 95 mm ring with induction heat or the sleeve drive-up procedure; at 4060 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 43 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 22219EMD1 by envelope alone: the 417 kN C0 and 33.4 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 43 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 416 kN rating no longer applies.",
      "The 416/417 kN ratings, 33.4 kN Pu and 4060 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22219EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22219EMD1?",
        "a": "22219EMD1 is an NTN double-row spherical roller bearing to ISO 15: 95 mm bore, 170 mm OD and 43 mm width (3.74 × 6.693 × 1.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 416 kN, C0 417 kN, Pu 33.4 kN, grease limiting speed 3,000 r/min, oil 3,800 r/min, mass about 4060 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22219EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22219EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22219EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22219EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22219EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22219EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 416 kN C / 417 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22219EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22219EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22219emd1",
      "＊22219emd1",
      "22219EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22219EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22219EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 95,
    "D_mm": 170,
    "B_mm": 43,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 416,
    "static_load_kN": 417,
    "fatigue_load_limit_kN": 33.4,
    "limiting_speed_rpm": 3000,
    "max_rpm": 3000,
    "speed_oil_rpm": 3800,
    "weight_g": 3980,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22219EMKD1 belongs to the 22200 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. Numbering ties 22219EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 95 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The 37.5 mm radial section over the 95 mm bore carries two roller rows; capacity per millimetre of bore is about 4.4 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Speed planning: 3,000 r/min grease limiting speed is the cage/kinematic ceiling and 3,800 r/min is the oil-lubricated value for the 95 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Fillet radii on shaft and housing must clear the ring chamfers of the 43 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Mount the 95 mm ring with induction heat or the sleeve drive-up procedure; at 3980 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22219EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 43 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 3,000 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22219EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 416/417 kN ratings, 33.4 kN Pu and 3980 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22219EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22219EMKD1?",
        "a": "22219EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 95 mm bore, 170 mm OD and 43 mm width (3.74 × 6.693 × 1.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 416 kN, C0 417 kN, Pu 33.4 kN, grease limiting speed 3,000 r/min, oil 3,800 r/min, mass about 3980 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22219EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22219EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22219EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22219EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22219EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22219EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 416 kN C / 417 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22219EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22219EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22219emkd1",
      "＊22219emkd1",
      "22219EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21319-NTN",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21319",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 95,
    "D_mm": 200,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 375,
    "static_load_kN": 420,
    "fatigue_load_limit_kN": 54,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2700,
    "weight_g": 7100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 95 mm shaft, NTN supplies 21319: sphered outer raceway, two roller rows, pressed-steel cage of the 213-series C design, oil speed 2,700 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (C/CK), bore (cylindrical), lubrication feature (none); 21319 is assembled exactly in that order. The cylindrical bore fits a machined 95 mm shaft seat directly; the same envelope in 21319K (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Pu 54 kN against C0 420 kN anchors the contamination derating; for dirty mining duty the adjusted life of 21319 moves with cleanliness far more than with small C variations. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 95 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Mount the 95 mm ring with induction heat or the sleeve drive-up procedure; at 7100 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 95 mm bearing, and drive-up procedures differ.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 375 kN rating no longer applies.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 21319 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Do not confuse EA and EM at the same number: 21319 carries C design-code; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 95×200 mm envelope is identical.",
      "The 375/420 kN ratings, 54 kN Pu and 7100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21319 (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21319?",
        "a": "21319 is an NTN double-row spherical roller bearing to ISO 15: 95 mm bore, 200 mm OD and 45 mm width (3.74 × 7.874 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 375 kN, C0 420 kN, Pu 54 kN, grease limiting speed 2,100 r/min, oil 2,700 r/min, mass about 7100 g. It is open, with pressed-steel cage of the 213-series C design."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "21319 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 21319K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21319 is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21319?",
        "a": "21319 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21319 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 375 kN C / 420 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21319",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×200×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "21319-EK",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×200×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "21319K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 21319K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21319",
      "21319-NTN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21319K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21319K",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 95,
    "D_mm": 200,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 375,
    "static_load_kN": 420,
    "fatigue_load_limit_kN": 54,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2700,
    "weight_g": 7000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "21319K belongs to the 21300 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (21300 series); the bore code resolves to 95 mm (two-digit code ×5, with the 00–03 exception table), and 200 mm OD / 45 mm width follow the general plan. Pu 54 kN is the catalogue fatigue load limit for 21319K, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. The 52.5 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 45 mm-wide ring seats fully on both sides. Never mount 21319K by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 200 mm race.",
    "applications": [
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Mount the 95 mm ring with induction heat or the sleeve drive-up procedure; at 7000 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Do not confuse EA and EM at the same number: 21319K carries C design-code; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 95×200 mm envelope is identical.",
      "Do not confuse EA and EM at the same number: 21319K carries C design-code; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 95×200 mm envelope is identical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 95 mm bearing, and drive-up procedures differ.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 21319K in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 375/420 kN ratings, 54 kN Pu and 7000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21319K (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21319K?",
        "a": "21319K is an NTN double-row spherical roller bearing to ISO 15: 95 mm bore, 200 mm OD and 45 mm width (3.74 × 7.874 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 375 kN, C0 420 kN, Pu 54 kN, grease limiting speed 2,100 r/min, oil 2,700 r/min, mass about 7000 g. It is open, with pressed-steel cage of the 213-series C design and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 21319K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 21319."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21319K is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21319K?",
        "a": "21319K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21319K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 375 kN C / 420 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21319-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 21319-NTN — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21319k",
      "21319K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22319EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22319EAD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 95,
    "D_mm": 200,
    "B_mm": 67,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 732,
    "static_load_kN": 751,
    "fatigue_load_limit_kN": 43.4,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2800,
    "weight_g": 9910,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22319EAD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 95×200×67 mm to ISO 15, with pressed sheet-steel window cage (EA high-capacity design). Numbering ties 22319EAD1 to its envelope and execution: same-number EA versus EM or plain variants share the 95 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The cylindrical bore fits a machined 95 mm shaft seat directly; the same envelope in 22319EAKD1 (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. With about 7.7 kN of C per millimetre of the 95 mm bore, 22319EAD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 95 mm set.",
    "applications": [
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Mount the 95 mm ring with induction heat or the sleeve drive-up procedure; at 9910 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Do not confuse EA and EM at the same number: 22319EAD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 95×200 mm envelope is identical.",
      "Oil relubrication toward 2,800 r/min needs drain and level design; flooding the 67 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 95 mm bearing, and drive-up procedures differ.",
      "Do not confuse EA and EM at the same number: 22319EAD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 95×200 mm envelope is identical.",
      "The 732/751 kN ratings, 43.4 kN Pu and 9910 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22319EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22319EAD1?",
        "a": "22319EAD1 is an NTN double-row spherical roller bearing to ISO 15: 95 mm bore, 200 mm OD and 67 mm width (3.74 × 7.874 × 2.638 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 732 kN, C0 751 kN, Pu 43.4 kN, grease limiting speed 2,300 r/min, oil 2,800 r/min, mass about 9910 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22319EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22319EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22319EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22319EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22319EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22319EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 732 kN C / 751 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22319EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22319EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22319ead1",
      "＊22319ead1",
      "22319EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22319EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22319EAKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 95,
    "D_mm": 200,
    "B_mm": 67,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 732,
    "static_load_kN": 751,
    "fatigue_load_limit_kN": 43.4,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2800,
    "weight_g": 9710,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 95 mm shaft, NTN supplies 22319EAKD1: sphered outer raceway, two roller rows, pressed sheet-steel window cage (EA high-capacity design), oil speed 2,800 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (K), lubrication feature (D1); 22319EAKD1 is assembled exactly in that order. At 732 kN C and 9710 g mass the 22300 series part is built for shock and vibration; the 67 mm-wide ring needs square abutments to keep both rows equally loaded. The 52.5 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 67 mm-wide ring seats fully on both sides. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Mount the 95 mm ring with induction heat or the sleeve drive-up procedure; at 9710 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Never substitute 22319EAKD1 by envelope alone: the 751 kN C0 and 43.4 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "Oil relubrication toward 2,800 r/min needs drain and level design; flooding the 67 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Do not confuse EA and EM at the same number: 22319EAKD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 95×200 mm envelope is identical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,300 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 732/751 kN ratings, 43.4 kN Pu and 9710 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22319EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22319EAKD1?",
        "a": "22319EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 95 mm bore, 200 mm OD and 67 mm width (3.74 × 7.874 × 2.638 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 732 kN, C0 751 kN, Pu 43.4 kN, grease limiting speed 2,300 r/min, oil 2,800 r/min, mass about 9710 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22319EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22319EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22319EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22319EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22319EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22319EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 732 kN C / 751 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22319EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22319EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22319eakd1",
      "＊22319eakd1",
      "22319EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22319EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22319EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 95,
    "D_mm": 200,
    "B_mm": 67,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 732,
    "static_load_kN": 751,
    "fatigue_load_limit_kN": 43.4,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2800,
    "weight_g": 10000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22319EMD1 identifies a 95×200×67 mm (3.74 × 7.874 × 2.638 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. The leading digits are the ISO 15 dimension series (22300 series); the bore code resolves to 95 mm (two-digit code ×5, with the 00–03 exception table), and 200 mm OD / 67 mm width follow the general plan. The cylindrical bore fits a machined 95 mm shaft seat directly; the same envelope in 22319EMKD1 (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. 95 mm bore is 3.74 in and 200 mm OD is 7.874 in; the ISO 15 envelope swaps between brands, but the 732/751 kN ratings and cage design are NTN 2203E values. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22319EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Mount the 95 mm ring with induction heat or the sleeve drive-up procedure; at 10000 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 67 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 67 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22319EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Do not confuse EA and EM at the same number: 22319EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 95×200 mm envelope is identical.",
      "The 732/751 kN ratings, 43.4 kN Pu and 10000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22319EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22319EMD1?",
        "a": "22319EMD1 is an NTN double-row spherical roller bearing to ISO 15: 95 mm bore, 200 mm OD and 67 mm width (3.74 × 7.874 × 2.638 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 732 kN, C0 751 kN, Pu 43.4 kN, grease limiting speed 2,300 r/min, oil 2,800 r/min, mass about 10000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22319EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22319EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22319EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22319EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22319EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22319EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 732 kN C / 751 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22319EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22319EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22319emd1",
      "＊22319emd1",
      "22319EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22319EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22319EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 95,
    "D_mm": 200,
    "B_mm": 67,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 732,
    "static_load_kN": 751,
    "fatigue_load_limit_kN": 43.4,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2800,
    "weight_g": 9820,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 22319EMKD1 denotes the 95 mm bore spherical roller bearing (732 kN C / 751 kN C0) in the 22300 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (22300 series); the bore code resolves to 95 mm (two-digit code ×5, with the 00–03 exception table), and 200 mm OD / 67 mm width follow the general plan. Suffix reading on 22319EMKD1: EM identifies the high-capacity execution with a one-piece machined brass cage; K marks the 1:12 tapered bore; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. Equivalent-load planning keeps a radial plus moderate axial combination on 22319EMKD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Never mount 22319EMKD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 200 mm race.",
    "applications": [
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Mount the 95 mm ring with induction heat or the sleeve drive-up procedure; at 9820 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Do not confuse EA and EM at the same number: 22319EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 95×200 mm envelope is identical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22319EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,300 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 67 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 732/751 kN ratings, 43.4 kN Pu and 9820 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22319EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22319EMKD1?",
        "a": "22319EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 95 mm bore, 200 mm OD and 67 mm width (3.74 × 7.874 × 2.638 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 732 kN, C0 751 kN, Pu 43.4 kN, grease limiting speed 2,300 r/min, oil 2,800 r/min, mass about 9820 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22319EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22319EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22319EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22319EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22319EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22319EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 732 kN C / 751 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22319EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22319EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22319emkd1",
      "＊22319emkd1",
      "22319EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23120EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23120EAD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 100,
    "D_mm": 165,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 464,
    "static_load_kN": 563,
    "fatigue_load_limit_kN": 30.7,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 3000,
    "weight_g": 4370,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23120EAD1 belongs to the 23100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (cylindrical), lubrication feature (D1); 23120EAD1 is assembled exactly in that order. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. With about 4.6 kN of C per millimetre of the 100 mm bore, 23120EAD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 100 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Mount the 100 mm ring with induction heat or the sleeve drive-up procedure; at 4370 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 52 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23120EAD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23120EAD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23120EAD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 464/563 kN ratings, 30.7 kN Pu and 4370 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23120EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23120EAD1?",
        "a": "23120EAD1 is an NTN double-row spherical roller bearing to ISO 15: 100 mm bore, 165 mm OD and 52 mm width (3.937 × 6.496 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 464 kN, C0 563 kN, Pu 30.7 kN, grease limiting speed 2,400 r/min, oil 3,000 r/min, mass about 4370 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23120EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23120EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23120EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23120EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23120EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23120EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 464 kN C / 563 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23120EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23120EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23120ead1",
      "＊23120ead1",
      "23120EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23120EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23120EAKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 100,
    "D_mm": 165,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 464,
    "static_load_kN": 563,
    "fatigue_load_limit_kN": 30.7,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 3000,
    "weight_g": 4240,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23120EAKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 100 mm bore, 165 mm OD, 52 mm width, rated 2,400 r/min on grease. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (K), lubrication feature (D1); 23120EAKD1 is assembled exactly in that order. The 32.5 mm radial section over the 100 mm bore carries two roller rows; capacity per millimetre of bore is about 4.6 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Speed planning: 2,400 r/min grease limiting speed is the cage/kinematic ceiling and 3,000 r/min is the oil-lubricated value for the 100 mm bore; vibrating screens rarely approach either and are load/cage limited instead. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 100 mm set.",
    "applications": [
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "Mount the 100 mm ring with induction heat or the sleeve drive-up procedure; at 4240 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 52 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Do not confuse EA and EM at the same number: 23120EAKD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 100×165 mm envelope is identical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 52 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23120EAD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 464/563 kN ratings, 30.7 kN Pu and 4240 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23120EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23120EAKD1?",
        "a": "23120EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 100 mm bore, 165 mm OD and 52 mm width (3.937 × 6.496 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 464 kN, C0 563 kN, Pu 30.7 kN, grease limiting speed 2,400 r/min, oil 3,000 r/min, mass about 4240 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23120EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23120EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23120EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23120EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23120EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23120EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 464 kN C / 563 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23120EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23120EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23120eakd1",
      "＊23120eakd1",
      "23120EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23120EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23120EMD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 100,
    "D_mm": 165,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 480,
    "static_load_kN": 590,
    "fatigue_load_limit_kN": 32.1,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 3000,
    "weight_g": 4450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 100 mm shaft, NTN supplies 23120EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 3,000 r/min. Numbering ties 23120EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 100 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Pu 32.1 kN is the catalogue fatigue load limit for 23120EMD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. With about 4.8 kN of C per millimetre of the 100 mm bore, 23120EMD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Never mount 23120EMD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 165 mm race.",
    "applications": [
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Mount the 100 mm ring with induction heat or the sleeve drive-up procedure; at 4450 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 100 mm bearing, and drive-up procedures differ.",
      "The cylindrical-bore 23120EMD1 and its tapered-bore counterpart 23120EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 480 kN rating no longer applies.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23120EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 480/590 kN ratings, 32.1 kN Pu and 4450 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23120EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23120EMD1?",
        "a": "23120EMD1 is an NTN double-row spherical roller bearing to ISO 15: 100 mm bore, 165 mm OD and 52 mm width (3.937 × 6.496 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 480 kN, C0 590 kN, Pu 32.1 kN, grease limiting speed 2,400 r/min, oil 3,000 r/min, mass about 4450 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23120EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23120EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23120EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23120EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23120EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23120EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 480 kN C / 590 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23120EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23120EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23120emd1",
      "＊23120emd1",
      "23120EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23120EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23120EMKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 100,
    "D_mm": 165,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 480,
    "static_load_kN": 590,
    "fatigue_load_limit_kN": 32.1,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 3000,
    "weight_g": 4320,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23120EMKD1 belongs to the 23100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (23100 series); the bore code resolves to 100 mm (two-digit code ×5, with the 00–03 exception table), and 165 mm OD / 52 mm width follow the general plan. At 480 kN C and 4320 g mass the 23100 series part is built for shock and vibration; the 52 mm-wide ring needs square abutments to keep both rows equally loaded. Speed planning: 2,400 r/min grease limiting speed is the cage/kinematic ceiling and 3,000 r/min is the oil-lubricated value for the 100 mm bore; vibrating screens rarely approach either and are load/cage limited instead. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 100 mm set.",
    "applications": [
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Mount the 100 mm ring with induction heat or the sleeve drive-up procedure; at 4320 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23120EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Never substitute 23120EMKD1 by envelope alone: the 590 kN C0 and 32.1 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23120EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,400 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 480/590 kN ratings, 32.1 kN Pu and 4320 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23120EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23120EMKD1?",
        "a": "23120EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 100 mm bore, 165 mm OD and 52 mm width (3.937 × 6.496 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 480 kN, C0 590 kN, Pu 32.1 kN, grease limiting speed 2,400 r/min, oil 3,000 r/min, mass about 4320 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23120EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23120EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23120EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23120EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23120EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23120EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 480 kN C / 590 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23120EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23120EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23120emkd1",
      "＊23120emkd1",
      "23120EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22220EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22220EAD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 100,
    "D_mm": 180,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 472,
    "static_load_kN": 495,
    "fatigue_load_limit_kN": 36.9,
    "limiting_speed_rpm": 2800,
    "max_rpm": 2800,
    "speed_oil_rpm": 3600,
    "weight_g": 4900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22220EAD1 is the EA pressed-steel-cage execution of NTN's spherical roller range for a 100 mm shaft — 472 kN basic dynamic capacity in a 4900 g, open ISO 15 envelope. Numbering ties 22220EAD1 to its envelope and execution: same-number EA versus EM or plain variants share the 100 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The 40.0 mm radial section over the 100 mm bore carries two roller rows; capacity per millimetre of bore is about 4.7 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. The 40.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 46 mm-wide ring seats fully on both sides. Never mount 22220EAD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 180 mm race.",
    "applications": [
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Mount the 100 mm ring with induction heat or the sleeve drive-up procedure; at 4900 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Do not confuse EA and EM at the same number: 22220EAD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 100×180 mm envelope is identical.",
      "Never substitute 22220EAD1 by envelope alone: the 495 kN C0 and 36.9 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "Oil relubrication toward 3,600 r/min needs drain and level design; flooding the 46 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The cylindrical-bore 22220EAD1 and its tapered-bore counterpart 22220EAKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 472/495 kN ratings, 36.9 kN Pu and 4900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22220EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22220EAD1?",
        "a": "22220EAD1 is an NTN double-row spherical roller bearing to ISO 15: 100 mm bore, 180 mm OD and 46 mm width (3.937 × 7.087 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 472 kN, C0 495 kN, Pu 36.9 kN, grease limiting speed 2,800 r/min, oil 3,600 r/min, mass about 4900 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22220EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22220EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22220EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22220EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22220EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22220EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 472 kN C / 495 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22220EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22220EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22220ead1",
      "＊22220ead1",
      "22220EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22220EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22220EAKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 100,
    "D_mm": 180,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 472,
    "static_load_kN": 495,
    "fatigue_load_limit_kN": 36.9,
    "limiting_speed_rpm": 2800,
    "max_rpm": 2800,
    "speed_oil_rpm": 3600,
    "weight_g": 4800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22220EAKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 100 mm bore, 180 mm OD, 46 mm width, rated 2,800 r/min on grease. Digit by digit the code reads as spherical-roller dimension series plus 100 mm bore; the 46 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. At 472 kN C and 4800 g mass the 22200 series part is built for shock and vibration; the 46 mm-wide ring needs square abutments to keep both rows equally loaded. The 40.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 46 mm-wide ring seats fully on both sides. Mount 22220EAKD1 on its adapter or withdrawal sleeve on the 100 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Mount the 100 mm ring with induction heat or the sleeve drive-up procedure; at 4800 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 100 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22220EAKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Never substitute 22220EAKD1 by envelope alone: the 495 kN C0 and 36.9 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,800 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 472/495 kN ratings, 36.9 kN Pu and 4800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22220EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22220EAKD1?",
        "a": "22220EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 100 mm bore, 180 mm OD and 46 mm width (3.937 × 7.087 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 472 kN, C0 495 kN, Pu 36.9 kN, grease limiting speed 2,800 r/min, oil 3,600 r/min, mass about 4800 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22220EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22220EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22220EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22220EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22220EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22220EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 472 kN C / 495 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22220EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22220EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22220eakd1",
      "＊22220eakd1",
      "22220EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22220EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22220EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 100,
    "D_mm": 180,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 472,
    "static_load_kN": 495,
    "fatigue_load_limit_kN": 36.9,
    "limiting_speed_rpm": 2800,
    "max_rpm": 2800,
    "speed_oil_rpm": 3600,
    "weight_g": 5020,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 22220EMD1 denotes the 100 mm bore spherical roller bearing (472 kN C / 495 kN C0) in the 22200 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (22200 series); the bore code resolves to 100 mm (two-digit code ×5, with the 00–03 exception table), and 180 mm OD / 46 mm width follow the general plan. The 40.0 mm radial section over the 100 mm bore carries two roller rows; capacity per millimetre of bore is about 4.7 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Selection: the C0/C ratio of 1.05 (495/472 kN) reflects the heavy static and shock proportioning of 22220EMD1; size the equivalent load at the required L10 with shock factor for the application. Fit the cylindrical-bore 22220EMD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Mount the 100 mm ring with induction heat or the sleeve drive-up procedure; at 5020 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 46 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 100 mm bearing, and drive-up procedures differ.",
      "Never substitute 22220EMD1 by envelope alone: the 495 kN C0 and 36.9 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The cylindrical-bore 22220EMD1 and its tapered-bore counterpart 22220EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 472/495 kN ratings, 36.9 kN Pu and 5020 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22220EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22220EMD1?",
        "a": "22220EMD1 is an NTN double-row spherical roller bearing to ISO 15: 100 mm bore, 180 mm OD and 46 mm width (3.937 × 7.087 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 472 kN, C0 495 kN, Pu 36.9 kN, grease limiting speed 2,800 r/min, oil 3,600 r/min, mass about 5020 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22220EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22220EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22220EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22220EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22220EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22220EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 472 kN C / 495 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22220EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22220EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22220emd1",
      "＊22220emd1",
      "22220EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22220EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22220EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 100,
    "D_mm": 180,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 472,
    "static_load_kN": 495,
    "fatigue_load_limit_kN": 36.9,
    "limiting_speed_rpm": 2800,
    "max_rpm": 2800,
    "speed_oil_rpm": 3600,
    "weight_g": 4930,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22220EMKD1 belongs to the 22200 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. Numbering ties 22220EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 100 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Suffix reading on 22220EMKD1: EM identifies the high-capacity execution with a one-piece machined brass cage; K marks the 1:12 tapered bore; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. Selection: the C0/C ratio of 1.05 (495/472 kN) reflects the heavy static and shock proportioning of 22220EMKD1; size the equivalent load at the required L10 with shock factor for the application. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 100 mm set.",
    "applications": [
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Mount the 100 mm ring with induction heat or the sleeve drive-up procedure; at 4930 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Oil relubrication toward 3,600 r/min needs drain and level design; flooding the 46 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Do not confuse EA and EM at the same number: 22220EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 100×180 mm envelope is identical.",
      "Oil relubrication toward 3,600 r/min needs drain and level design; flooding the 46 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 46 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 472/495 kN ratings, 36.9 kN Pu and 4930 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22220EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22220EMKD1?",
        "a": "22220EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 100 mm bore, 180 mm OD and 46 mm width (3.937 × 7.087 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 472 kN, C0 495 kN, Pu 36.9 kN, grease limiting speed 2,800 r/min, oil 3,600 r/min, mass about 4930 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22220EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22220EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22220EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22220EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22220EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22220EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 472 kN C / 495 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22220EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22220EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22220emkd1",
      "＊22220emkd1",
      "22220EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23220EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23220EMD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 100,
    "D_mm": 180,
    "B_mm": 60.3,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 586,
    "static_load_kN": 661,
    "fatigue_load_limit_kN": 36.3,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2900,
    "weight_g": 6510,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23220EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 100 mm shaft — 586 kN basic dynamic capacity in a 6510 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 100 mm bore; the 60.3 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Suffix reading on 23220EMD1: EM identifies the high-capacity execution with a one-piece machined brass cage; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. Grease/oil ratio: the 2,300 r/min limiting value is .79 of the 2,900 r/min oil value; heavy 60.3 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Fillet radii on shaft and housing must clear the ring chamfers of the 60.3 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Mount the 100 mm ring with induction heat or the sleeve drive-up procedure; at 6510 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23220EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 100 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Never substitute 23220EMD1 by envelope alone: the 661 kN C0 and 36.3 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 60.3 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 586/661 kN ratings, 36.3 kN Pu and 6510 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23220EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23220EMD1?",
        "a": "23220EMD1 is an NTN double-row spherical roller bearing to ISO 15: 100 mm bore, 180 mm OD and 60.3 mm width (3.937 × 7.087 × 2.374 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 586 kN, C0 661 kN, Pu 36.3 kN, grease limiting speed 2,300 r/min, oil 2,900 r/min, mass about 6510 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23220EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23220EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23220EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23220EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23220EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23220EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 586 kN C / 661 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23220EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23220EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23220emd1",
      "＊23220emd1",
      "23220EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23220EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23220EMKD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 100,
    "D_mm": 180,
    "B_mm": 60.3,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 586,
    "static_load_kN": 661,
    "fatigue_load_limit_kN": 36.3,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2900,
    "weight_g": 6330,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23220EMKD1 denotes the 100 mm bore spherical roller bearing (586 kN C / 661 kN C0) in the 23200 series, the self-aligning choice for heavy combined load. Reading the full code: the number gives the 100×180 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Selection: the C0/C ratio of 1.13 (661/586 kN) reflects the heavy static and shock proportioning of 23220EMKD1; size the equivalent load at the required L10 with shock factor for the application. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 100 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Mount the 100 mm ring with induction heat or the sleeve drive-up procedure; at 6330 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 100 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Do not confuse EA and EM at the same number: 23220EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 100×180 mm envelope is identical.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23220EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 100 mm bearing, and drive-up procedures differ.",
      "The 586/661 kN ratings, 36.3 kN Pu and 6330 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23220EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23220EMKD1?",
        "a": "23220EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 100 mm bore, 180 mm OD and 60.3 mm width (3.937 × 7.087 × 2.374 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 586 kN, C0 661 kN, Pu 36.3 kN, grease limiting speed 2,300 r/min, oil 2,900 r/min, mass about 6330 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23220EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23220EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23220EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23220EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23220EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23220EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 586 kN C / 661 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23220EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23220EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23220emkd1",
      "＊23220emkd1",
      "23220EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21320-NTN",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21320",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 100,
    "D_mm": 215,
    "B_mm": 47,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 410,
    "static_load_kN": 465,
    "fatigue_load_limit_kN": 42.5,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2600,
    "weight_g": 8890,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "21320 is the C design-code execution of NTN's spherical roller range for a 100 mm shaft — 410 kN basic dynamic capacity in a 8890 g, open ISO 15 envelope. The leading digits are the ISO 15 dimension series (21300 series); the bore code resolves to 100 mm (two-digit code ×5, with the 00–03 exception table), and 215 mm OD / 47 mm width follow the general plan. Suffix reading on 21320: C is the cage/design code for the NTN 213 series, CK adding the tapered bore; quote the full code because each suffix is a distinct article. Equivalent-load planning keeps a radial plus moderate axial combination on 21320; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Never mount 21320 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 215 mm race.",
    "applications": [
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "Mount the 100 mm ring with induction heat or the sleeve drive-up procedure; at 8890 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 21320 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Never substitute 21320 by envelope alone: the 465 kN C0 and 42.5 kN Pu are specific to the NTN C design-code execution, and vibrating duty depends heavily on cage identity.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 100 mm bearing, and drive-up procedures differ.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 47 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 410/465 kN ratings, 42.5 kN Pu and 8890 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21320 (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21320?",
        "a": "21320 is an NTN double-row spherical roller bearing to ISO 15: 100 mm bore, 215 mm OD and 47 mm width (3.937 × 8.465 × 1.85 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 410 kN, C0 465 kN, Pu 42.5 kN, grease limiting speed 2,000 r/min, oil 2,600 r/min, mass about 8890 g. It is open, with pressed-steel cage of the 213-series C design."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "21320 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 21320K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21320 is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21320?",
        "a": "21320 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21320 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 410 kN C / 465 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21320",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "21320-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "21320K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 21320K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21320",
      "21320-NTN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21320K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21320K",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 100,
    "D_mm": 215,
    "B_mm": 47,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 410,
    "static_load_kN": 465,
    "fatigue_load_limit_kN": 42.5,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2600,
    "weight_g": 8780,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 100 mm shaft, NTN supplies 21320K: sphered outer raceway, two roller rows, pressed-steel cage of the 213-series C design, oil speed 2,600 r/min. Reading the full code: the number gives the 100×215 mm envelope, C/CK names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. The 1:12 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 100 mm bore assembly. Speed planning: 2,000 r/min grease limiting speed is the cage/kinematic ceiling and 2,600 r/min is the oil-lubricated value for the 100 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Never mount 21320K by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 215 mm race.",
    "applications": [
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Mount the 100 mm ring with induction heat or the sleeve drive-up procedure; at 8780 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "213-series C/CK executions use the C cage/design code — CK adds the 1:12 tapered bore; quote 21320K in full because a C cannot be mounted on an adapter-sleeve tapered seat.",
      "Never substitute 21320K by envelope alone: the 465 kN C0 and 42.5 kN Pu are specific to the NTN C design-code execution, and vibrating duty depends heavily on cage identity.",
      "Do not confuse EA and EM at the same number: 21320K carries C design-code; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 100×215 mm envelope is identical.",
      "Do not confuse EA and EM at the same number: 21320K carries C design-code; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 100×215 mm envelope is identical.",
      "The 410/465 kN ratings, 42.5 kN Pu and 8780 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21320K (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21320K?",
        "a": "21320K is an NTN double-row spherical roller bearing to ISO 15: 100 mm bore, 215 mm OD and 47 mm width (3.937 × 8.465 × 1.85 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 410 kN, C0 465 kN, Pu 42.5 kN, grease limiting speed 2,000 r/min, oil 2,600 r/min, mass about 8780 g. It is open, with pressed-steel cage of the 213-series C design and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 21320K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 21320."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21320K is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21320K?",
        "a": "21320K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21320K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 410 kN C / 465 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21320-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 21320-NTN — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21320k",
      "21320K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22320EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22320EAD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 100,
    "D_mm": 215,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 827,
    "static_load_kN": 844,
    "fatigue_load_limit_kN": 50.1,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2600,
    "weight_g": 12600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 100 mm shaft, NTN supplies 22320EAD1: sphered outer raceway, two roller rows, pressed sheet-steel window cage (EA high-capacity design), oil speed 2,600 r/min. Digit by digit the code reads as spherical-roller dimension series plus 100 mm bore; the 73 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Speed planning: 2,100 r/min grease limiting speed is the cage/kinematic ceiling and 2,600 r/min is the oil-lubricated value for the 100 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Never mount 22320EAD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 215 mm race.",
    "applications": [
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Mount the 100 mm ring with induction heat or the sleeve drive-up procedure; at 12600 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 73 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 73 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The cylindrical-bore 22320EAD1 and its tapered-bore counterpart 22320EAKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22320EAD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 827/844 kN ratings, 50.1 kN Pu and 12600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22320EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22320EAD1?",
        "a": "22320EAD1 is an NTN double-row spherical roller bearing to ISO 15: 100 mm bore, 215 mm OD and 73 mm width (3.937 × 8.465 × 2.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 827 kN, C0 844 kN, Pu 50.1 kN, grease limiting speed 2,100 r/min, oil 2,600 r/min, mass about 12600 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22320EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22320EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22320EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22320EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22320EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22320EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 827 kN C / 844 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22320EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22320EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22320ead1",
      "＊22320ead1",
      "22320EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22320EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22320EAKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 100,
    "D_mm": 215,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 827,
    "static_load_kN": 844,
    "fatigue_load_limit_kN": 50.1,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2600,
    "weight_g": 12300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 100 mm shaft, NTN supplies 22320EAKD1: sphered outer raceway, two roller rows, pressed sheet-steel window cage (EA high-capacity design), oil speed 2,600 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (K), lubrication feature (D1); 22320EAKD1 is assembled exactly in that order. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Equivalent-load planning keeps a radial plus moderate axial combination on 22320EAKD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Fillet radii on shaft and housing must clear the ring chamfers of the 73 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Mount the 100 mm ring with induction heat or the sleeve drive-up procedure; at 12300 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 827 kN rating no longer applies.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 827 kN rating no longer applies.",
      "Never substitute 22320EAKD1 by envelope alone: the 844 kN C0 and 50.1 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 100 mm bearing, and drive-up procedures differ.",
      "The 827/844 kN ratings, 50.1 kN Pu and 12300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22320EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22320EAKD1?",
        "a": "22320EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 100 mm bore, 215 mm OD and 73 mm width (3.937 × 8.465 × 2.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 827 kN, C0 844 kN, Pu 50.1 kN, grease limiting speed 2,100 r/min, oil 2,600 r/min, mass about 12300 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22320EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22320EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22320EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22320EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22320EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22320EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 827 kN C / 844 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22320EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22320EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22320eakd1",
      "＊22320eakd1",
      "22320EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22320EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22320EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 100,
    "D_mm": 215,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 827,
    "static_load_kN": 844,
    "fatigue_load_limit_kN": 50.1,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2600,
    "weight_g": 12900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22320EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 100 mm bore, 215 mm OD, 73 mm width, rated 2,100 r/min on grease. Reading the full code: the number gives the 100×215 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. Pu 50.1 kN is the catalogue fatigue load limit for 22320EMD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Speed planning: 2,100 r/min grease limiting speed is the cage/kinematic ceiling and 2,600 r/min is the oil-lubricated value for the 100 mm bore; vibrating screens rarely approach either and are load/cage limited instead. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 100 mm set.",
    "applications": [
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Mount the 100 mm ring with induction heat or the sleeve drive-up procedure; at 12900 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 100 mm bearing, and drive-up procedures differ.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 827 kN rating no longer applies.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 73 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22320EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 827/844 kN ratings, 50.1 kN Pu and 12900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22320EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22320EMD1?",
        "a": "22320EMD1 is an NTN double-row spherical roller bearing to ISO 15: 100 mm bore, 215 mm OD and 73 mm width (3.937 × 8.465 × 2.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 827 kN, C0 844 kN, Pu 50.1 kN, grease limiting speed 2,100 r/min, oil 2,600 r/min, mass about 12900 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22320EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22320EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22320EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22320EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22320EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22320EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 827 kN C / 844 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22320EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22320EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22320emd1",
      "＊22320emd1",
      "22320EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22320EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22320EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 100,
    "D_mm": 215,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 827,
    "static_load_kN": 844,
    "fatigue_load_limit_kN": 50.1,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2600,
    "weight_g": 12700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 22320EMKD1 denotes the 100 mm bore spherical roller bearing (827 kN C / 844 kN C0) in the 22300 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (22300 series); the bore code resolves to 100 mm (two-digit code ×5, with the 00–03 exception table), and 215 mm OD / 73 mm width follow the general plan. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Equivalent-load planning keeps a radial plus moderate axial combination on 22320EMKD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Fillet radii on shaft and housing must clear the ring chamfers of the 73 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "Mount the 100 mm ring with induction heat or the sleeve drive-up procedure; at 12700 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22320EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22320EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 100 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22320EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 827/844 kN ratings, 50.1 kN Pu and 12700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22320EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22320EMKD1?",
        "a": "22320EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 100 mm bore, 215 mm OD and 73 mm width (3.937 × 8.465 × 2.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 827 kN, C0 844 kN, Pu 50.1 kN, grease limiting speed 2,100 r/min, oil 2,600 r/min, mass about 12700 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22320EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22320EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22320EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22320EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22320EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22320EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 827 kN C / 844 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22320EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22320EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22320emkd1",
      "＊22320emkd1",
      "22320EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23022EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23022EAD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 170,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 417,
    "static_load_kN": 517,
    "fatigue_load_limit_kN": 32.1,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3300,
    "weight_g": 3660,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23022EAD1 identifies a 110×170×45 mm (4.331 × 6.693 × 1.772 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Numbering ties 23022EAD1 to its envelope and execution: same-number EA versus EM or plain variants share the 110 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. NTN prints two speeds for 23022EAD1: 2,600 r/min grease and 3,300 r/min oil — the gap of 700 r/min reflects oil cooling of the heavy roller set. Pu 32.1 kN against C0 517 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23022EAD1 moves with cleanliness far more than with small C variations. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 110 mm set.",
    "applications": [
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Mount the 110 mm ring with induction heat or the sleeve drive-up procedure; at 3660 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Never substitute 23022EAD1 by envelope alone: the 517 kN C0 and 32.1 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23022EAD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Do not confuse EA and EM at the same number: 23022EAD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 110×170 mm envelope is identical.",
      "Oil relubrication toward 3,300 r/min needs drain and level design; flooding the 45 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 417/517 kN ratings, 32.1 kN Pu and 3660 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23022EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23022EAD1?",
        "a": "23022EAD1 is an NTN double-row spherical roller bearing to ISO 15: 110 mm bore, 170 mm OD and 45 mm width (4.331 × 6.693 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 417 kN, C0 517 kN, Pu 32.1 kN, grease limiting speed 2,600 r/min, oil 3,300 r/min, mass about 3660 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23022EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23022EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23022EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23022EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23022EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23022EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 417 kN C / 517 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23022EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23022EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23022ead1",
      "＊23022ead1",
      "23022EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23022EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23022EAKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 170,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 417,
    "static_load_kN": 517,
    "fatigue_load_limit_kN": 32.1,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3300,
    "weight_g": 3550,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23022EAKD1 identifies a 110×170×45 mm (4.331 × 6.693 × 1.772 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 110 mm bore; the 45 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The 1:12 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 110 mm bore assembly. Speed planning: 2,600 r/min grease limiting speed is the cage/kinematic ceiling and 3,300 r/min is the oil-lubricated value for the 110 mm bore; vibrating screens rarely approach either and are load/cage limited instead. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 23022EAKD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "Mount the 110 mm ring with induction heat or the sleeve drive-up procedure; at 3550 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23022EAKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23022EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Never substitute 23022EAKD1 by envelope alone: the 517 kN C0 and 32.1 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "Do not confuse EA and EM at the same number: 23022EAKD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 110×170 mm envelope is identical.",
      "The 417/517 kN ratings, 32.1 kN Pu and 3550 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23022EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23022EAKD1?",
        "a": "23022EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 110 mm bore, 170 mm OD and 45 mm width (4.331 × 6.693 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 417 kN, C0 517 kN, Pu 32.1 kN, grease limiting speed 2,600 r/min, oil 3,300 r/min, mass about 3550 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23022EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23022EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23022EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23022EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23022EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23022EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 417 kN C / 517 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23022EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23022EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23022eakd1",
      "＊23022eakd1",
      "23022EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23022EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23022EMD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 170,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 417,
    "static_load_kN": 517,
    "fatigue_load_limit_kN": 32.1,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3300,
    "weight_g": 3660,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23022EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 110 mm shaft — 417 kN basic dynamic capacity in a 3660 g, open ISO 15 envelope. Numbering ties 23022EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 110 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. NTN prints two speeds for 23022EMD1: 2,600 r/min grease and 3,300 r/min oil — the gap of 700 r/min reflects oil cooling of the heavy roller set. Speed planning: 2,600 r/min grease limiting speed is the cage/kinematic ceiling and 3,300 r/min is the oil-lubricated value for the 110 mm bore; vibrating screens rarely approach either and are load/cage limited instead. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 23022EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Mount the 110 mm ring with induction heat or the sleeve drive-up procedure; at 3660 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,600 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The cylindrical-bore 23022EMD1 and its tapered-bore counterpart 23022EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 45 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Oil relubrication toward 3,300 r/min needs drain and level design; flooding the 45 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 417/517 kN ratings, 32.1 kN Pu and 3660 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23022EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23022EMD1?",
        "a": "23022EMD1 is an NTN double-row spherical roller bearing to ISO 15: 110 mm bore, 170 mm OD and 45 mm width (4.331 × 6.693 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 417 kN, C0 517 kN, Pu 32.1 kN, grease limiting speed 2,600 r/min, oil 3,300 r/min, mass about 3660 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23022EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23022EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23022EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23022EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23022EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23022EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 417 kN C / 517 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23022EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23022EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23022emd1",
      "＊23022emd1",
      "23022EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23022EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23022EMKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 170,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 417,
    "static_load_kN": 517,
    "fatigue_load_limit_kN": 32.1,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3300,
    "weight_g": 3550,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23022EMKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 110 mm bore, 170 mm OD, 45 mm width, rated 2,600 r/min on grease. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 23022EMKD1 is assembled exactly in that order. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Selection: the C0/C ratio of 1.24 (517/417 kN) reflects the heavy static and shock proportioning of 23022EMKD1; size the equivalent load at the required L10 with shock factor for the application. Fillet radii on shaft and housing must clear the ring chamfers of the 45 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Mount the 110 mm ring with induction heat or the sleeve drive-up procedure; at 3550 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 417 kN rating no longer applies.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 45 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Oil relubrication toward 3,300 r/min needs drain and level design; flooding the 45 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 110 mm bearing, and drive-up procedures differ.",
      "The 417/517 kN ratings, 32.1 kN Pu and 3550 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23022EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23022EMKD1?",
        "a": "23022EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 110 mm bore, 170 mm OD and 45 mm width (4.331 × 6.693 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 417 kN, C0 517 kN, Pu 32.1 kN, grease limiting speed 2,600 r/min, oil 3,300 r/min, mass about 3550 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23022EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23022EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23022EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23022EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23022EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23022EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 417 kN C / 517 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23022EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23022EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23022emkd1",
      "＊23022emkd1",
      "23022EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23122EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23122EAD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 180,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 547,
    "static_load_kN": 669,
    "fatigue_load_limit_kN": 36.2,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2800,
    "weight_g": 5660,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23122EAD1 belongs to the 23100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. Digit by digit the code reads as spherical-roller dimension series plus 110 mm bore; the 56 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Suffix reading on 23122EAD1: EA identifies the high-capacity execution with a pressed sheet-steel window cage; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. With about 5.0 kN of C per millimetre of the 110 mm bore, 23122EAD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 110 mm set.",
    "applications": [
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Mount the 110 mm ring with induction heat or the sleeve drive-up procedure; at 5660 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The cylindrical-bore 23122EAD1 and its tapered-bore counterpart 23122EAKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Never substitute 23122EAD1 by envelope alone: the 669 kN C0 and 36.2 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 110 mm bearing, and drive-up procedures differ.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 56 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 547/669 kN ratings, 36.2 kN Pu and 5660 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23122EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23122EAD1?",
        "a": "23122EAD1 is an NTN double-row spherical roller bearing to ISO 15: 110 mm bore, 180 mm OD and 56 mm width (4.331 × 7.087 × 2.205 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 547 kN, C0 669 kN, Pu 36.2 kN, grease limiting speed 2,200 r/min, oil 2,800 r/min, mass about 5660 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23122EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23122EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23122EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23122EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23122EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23122EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 547 kN C / 669 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23122EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23122EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23122ead1",
      "＊23122ead1",
      "23122EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23122EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23122EAKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 180,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 547,
    "static_load_kN": 669,
    "fatigue_load_limit_kN": 36.2,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2800,
    "weight_g": 5490,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23122EAKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 110×180×56 mm to ISO 15, with pressed sheet-steel window cage (EA high-capacity design). On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (K), lubrication feature (D1); 23122EAKD1 is assembled exactly in that order. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Selection: the C0/C ratio of 1.22 (669/547 kN) reflects the heavy static and shock proportioning of 23122EAKD1; size the equivalent load at the required L10 with shock factor for the application. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "Mount the 110 mm ring with induction heat or the sleeve drive-up procedure; at 5490 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23122EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Oil relubrication toward 2,800 r/min needs drain and level design; flooding the 56 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Never substitute 23122EAKD1 by envelope alone: the 669 kN C0 and 36.2 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23122EAKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 547/669 kN ratings, 36.2 kN Pu and 5490 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23122EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23122EAKD1?",
        "a": "23122EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 110 mm bore, 180 mm OD and 56 mm width (4.331 × 7.087 × 2.205 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 547 kN, C0 669 kN, Pu 36.2 kN, grease limiting speed 2,200 r/min, oil 2,800 r/min, mass about 5490 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23122EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23122EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23122EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23122EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23122EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23122EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 547 kN C / 669 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23122EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23122EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23122eakd1",
      "＊23122eakd1",
      "23122EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23122EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23122EMD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 180,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 547,
    "static_load_kN": 669,
    "fatigue_load_limit_kN": 36.2,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2800,
    "weight_g": 5530,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 110 mm shaft, NTN supplies 23122EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 2,800 r/min. Digit by digit the code reads as spherical-roller dimension series plus 110 mm bore; the 56 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Pu 36.2 kN against C0 669 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23122EMD1 moves with cleanliness far more than with small C variations. Fillet radii on shaft and housing must clear the ring chamfers of the 56 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Mount the 110 mm ring with induction heat or the sleeve drive-up procedure; at 5530 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Do not confuse EA and EM at the same number: 23122EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 110×180 mm envelope is identical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 110 mm bearing, and drive-up procedures differ.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 110 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 110 mm bearing, and drive-up procedures differ.",
      "The 547/669 kN ratings, 36.2 kN Pu and 5530 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23122EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23122EMD1?",
        "a": "23122EMD1 is an NTN double-row spherical roller bearing to ISO 15: 110 mm bore, 180 mm OD and 56 mm width (4.331 × 7.087 × 2.205 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 547 kN, C0 669 kN, Pu 36.2 kN, grease limiting speed 2,200 r/min, oil 2,800 r/min, mass about 5530 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23122EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23122EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23122EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23122EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23122EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23122EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 547 kN C / 669 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23122EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23122EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23122emd1",
      "＊23122emd1",
      "23122EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23122EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23122EMKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 180,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 547,
    "static_load_kN": 669,
    "fatigue_load_limit_kN": 36.2,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2800,
    "weight_g": 5360,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 110 mm shaft, NTN supplies 23122EMKD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 2,800 r/min. The leading digits are the ISO 15 dimension series (23100 series); the bore code resolves to 110 mm (two-digit code ×5, with the 00–03 exception table), and 180 mm OD / 56 mm width follow the general plan. Pu 36.2 kN is the catalogue fatigue load limit for 23122EMKD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Selection: the C0/C ratio of 1.22 (669/547 kN) reflects the heavy static and shock proportioning of 23122EMKD1; size the equivalent load at the required L10 with shock factor for the application. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Mount the 110 mm ring with induction heat or the sleeve drive-up procedure; at 5360 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Oil relubrication toward 2,800 r/min needs drain and level design; flooding the 56 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23122EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 110 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23122EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 547/669 kN ratings, 36.2 kN Pu and 5360 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23122EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23122EMKD1?",
        "a": "23122EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 110 mm bore, 180 mm OD and 56 mm width (4.331 × 7.087 × 2.205 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 547 kN, C0 669 kN, Pu 36.2 kN, grease limiting speed 2,200 r/min, oil 2,800 r/min, mass about 5360 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23122EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23122EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23122EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23122EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23122EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23122EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 547 kN C / 669 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23122EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23122EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23122emkd1",
      "＊23122emkd1",
      "23122EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24122EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24122EMD1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 180,
    "B_mm": 69,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 622,
    "static_load_kN": 769,
    "fatigue_load_limit_kN": 35.7,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2700,
    "weight_g": 6750,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24122EMD1 belongs to the 24100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 24122EMD1 is assembled exactly in that order. Pu 35.7 kN is the catalogue fatigue load limit for 24122EMD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Pu 35.7 kN against C0 769 kN anchors the contamination derating; for dirty mining duty the adjusted life of 24122EMD1 moves with cleanliness far more than with small C variations. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "Mount the 110 mm ring with induction heat or the sleeve drive-up procedure; at 6750 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 69 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 110 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24122EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24122EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 622/769 kN ratings, 35.7 kN Pu and 6750 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24122EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24122EMD1?",
        "a": "24122EMD1 is an NTN double-row spherical roller bearing to ISO 15: 110 mm bore, 180 mm OD and 69 mm width (4.331 × 7.087 × 2.717 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 622 kN, C0 769 kN, Pu 35.7 kN, grease limiting speed 2,200 r/min, oil 2,700 r/min, mass about 6750 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24122EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24122EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24122EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24122EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24122EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24122EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 622 kN C / 769 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24122EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24122EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24122emd1",
      "＊24122emd1",
      "24122EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24122EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24122EMK30D1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 180,
    "B_mm": 69,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 622,
    "static_load_kN": 769,
    "fatigue_load_limit_kN": 35.7,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2700,
    "weight_g": 6650,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 24122EMK30D1 with a 1:30 tapered bore (K30) and D1 outer-ring annular oil groove with holes: 110 mm bore, 180 mm OD, 69 mm width, rated 2,200 r/min on grease. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 110 mm (two-digit code ×5, with the 00–03 exception table), and 180 mm OD / 69 mm width follow the general plan. At 622 kN C and 6650 g mass the 24100 series part is built for shock and vibration; the 69 mm-wide ring needs square abutments to keep both rows equally loaded. The 35.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 69 mm-wide ring seats fully on both sides. Fillet radii on shaft and housing must clear the ring chamfers of the 69 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Mount the 110 mm ring with induction heat or the sleeve drive-up procedure; at 6650 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Oil relubrication toward 2,700 r/min needs drain and level design; flooding the 69 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Never substitute 24122EMK30D1 by envelope alone: the 769 kN C0 and 35.7 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 24122EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,200 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 622/769 kN ratings, 35.7 kN Pu and 6650 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24122EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24122EMK30D1?",
        "a": "24122EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 110 mm bore, 180 mm OD and 69 mm width (4.331 × 7.087 × 2.717 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 622 kN, C0 769 kN, Pu 35.7 kN, grease limiting speed 2,200 r/min, oil 2,700 r/min, mass about 6650 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24122EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 110 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24122EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24122EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24122EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24122EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24122EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 622 kN C / 769 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24122EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24122EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24122emk30d1",
      "＊24122emk30d1",
      "24122EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22222EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22222EAD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 200,
    "B_mm": 53,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 602,
    "static_load_kN": 643,
    "fatigue_load_limit_kN": 45,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3300,
    "weight_g": 7100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22222EAD1 is the EA pressed-steel-cage execution of NTN's spherical roller range for a 110 mm shaft — 602 kN basic dynamic capacity in a 7100 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 110 mm bore; the 53 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. NTN prints two speeds for 22222EAD1: 2,600 r/min grease and 3,300 r/min oil — the gap of 700 r/min reflects oil cooling of the heavy roller set. Grease/oil ratio: the 2,600 r/min limiting value is .79 of the 3,300 r/min oil value; heavy 53 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Fillet radii on shaft and housing must clear the ring chamfers of the 53 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "Mount the 110 mm ring with induction heat or the sleeve drive-up procedure; at 7100 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The cylindrical-bore 22222EAD1 and its tapered-bore counterpart 22222EAKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 53 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 602 kN rating no longer applies.",
      "Oil relubrication toward 3,300 r/min needs drain and level design; flooding the 53 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 602/643 kN ratings, 45 kN Pu and 7100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22222EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22222EAD1?",
        "a": "22222EAD1 is an NTN double-row spherical roller bearing to ISO 15: 110 mm bore, 200 mm OD and 53 mm width (4.331 × 7.874 × 2.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 602 kN, C0 643 kN, Pu 45 kN, grease limiting speed 2,600 r/min, oil 3,300 r/min, mass about 7100 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22222EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22222EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22222EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22222EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22222EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22222EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 602 kN C / 643 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22222EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22222EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22222ead1",
      "＊22222ead1",
      "22222EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22222EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22222EAKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 200,
    "B_mm": 53,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 602,
    "static_load_kN": 643,
    "fatigue_load_limit_kN": 45,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3300,
    "weight_g": 6950,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22222EAKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 110×200×53 mm to ISO 15, with pressed sheet-steel window cage (EA high-capacity design). Digit by digit the code reads as spherical-roller dimension series plus 110 mm bore; the 53 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Pu 45 kN is the catalogue fatigue load limit for 22222EAKD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Equivalent-load planning keeps a radial plus moderate axial combination on 22222EAKD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 110 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Mount the 110 mm ring with induction heat or the sleeve drive-up procedure; at 6950 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Never substitute 22222EAKD1 by envelope alone: the 643 kN C0 and 45 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,600 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22222EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22222EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 602/643 kN ratings, 45 kN Pu and 6950 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22222EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22222EAKD1?",
        "a": "22222EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 110 mm bore, 200 mm OD and 53 mm width (4.331 × 7.874 × 2.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 602 kN, C0 643 kN, Pu 45 kN, grease limiting speed 2,600 r/min, oil 3,300 r/min, mass about 6950 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22222EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22222EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22222EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22222EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22222EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22222EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 602 kN C / 643 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22222EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22222EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22222eakd1",
      "＊22222eakd1",
      "22222EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22222EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22222EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 200,
    "B_mm": 53,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 602,
    "static_load_kN": 643,
    "fatigue_load_limit_kN": 45,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3300,
    "weight_g": 7300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22222EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 110 mm shaft — 602 kN basic dynamic capacity in a 7300 g, open ISO 15 envelope. Reading the full code: the number gives the 110×200 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. Pu 45 kN is the catalogue fatigue load limit for 22222EMD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Equivalent-load planning keeps a radial plus moderate axial combination on 22222EMD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Fit the cylindrical-bore 22222EMD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Mount the 110 mm ring with induction heat or the sleeve drive-up procedure; at 7300 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,600 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22222EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Oil relubrication toward 3,300 r/min needs drain and level design; flooding the 53 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22222EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 602/643 kN ratings, 45 kN Pu and 7300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22222EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22222EMD1?",
        "a": "22222EMD1 is an NTN double-row spherical roller bearing to ISO 15: 110 mm bore, 200 mm OD and 53 mm width (4.331 × 7.874 × 2.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 602 kN, C0 643 kN, Pu 45 kN, grease limiting speed 2,600 r/min, oil 3,300 r/min, mass about 7300 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22222EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22222EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22222EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22222EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22222EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22222EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 602 kN C / 643 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22222EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22222EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22222emd1",
      "＊22222emd1",
      "22222EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22222EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22222EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 200,
    "B_mm": 53,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 602,
    "static_load_kN": 643,
    "fatigue_load_limit_kN": 45,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3300,
    "weight_g": 7150,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 110 mm shaft, NTN supplies 22222EMKD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 3,300 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 22222EMKD1 is assembled exactly in that order. Open by design, 22222EMKD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Grease/oil ratio: the 2,600 r/min limiting value is .79 of the 3,300 r/min oil value; heavy 53 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Mount the 110 mm ring with induction heat or the sleeve drive-up procedure; at 7150 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Do not confuse EA and EM at the same number: 22222EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 110×200 mm envelope is identical.",
      "Oil relubrication toward 3,300 r/min needs drain and level design; flooding the 53 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22222EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 602 kN rating no longer applies.",
      "The 602/643 kN ratings, 45 kN Pu and 7150 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22222EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22222EMKD1?",
        "a": "22222EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 110 mm bore, 200 mm OD and 53 mm width (4.331 × 7.874 × 2.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 602 kN, C0 643 kN, Pu 45 kN, grease limiting speed 2,600 r/min, oil 3,300 r/min, mass about 7150 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22222EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22222EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22222EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22222EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22222EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22222EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 602 kN C / 643 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22222EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22222EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22222emkd1",
      "＊22222emkd1",
      "22222EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23222EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23222EMD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 200,
    "B_mm": 69.8,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 752,
    "static_load_kN": 869,
    "fatigue_load_limit_kN": 43.9,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2600,
    "weight_g": 9410,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23222EMD1 identifies a 110×200×69.8 mm (4.331 × 7.874 × 2.748 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 23222EMD1 is assembled exactly in that order. NTN prints two speeds for 23222EMD1: 2,100 r/min grease and 2,600 r/min oil — the gap of 500 r/min reflects oil cooling of the heavy roller set. With about 6.8 kN of C per millimetre of the 110 mm bore, 23222EMD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Fillet radii on shaft and housing must clear the ring chamfers of the 69.8 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Mount the 110 mm ring with induction heat or the sleeve drive-up procedure; at 9410 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 69.8 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 752 kN rating no longer applies.",
      "Oil relubrication toward 2,600 r/min needs drain and level design; flooding the 69.8 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Oil relubrication toward 2,600 r/min needs drain and level design; flooding the 69.8 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 752/869 kN ratings, 43.9 kN Pu and 9410 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23222EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23222EMD1?",
        "a": "23222EMD1 is an NTN double-row spherical roller bearing to ISO 15: 110 mm bore, 200 mm OD and 69.8 mm width (4.331 × 7.874 × 2.748 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 752 kN, C0 869 kN, Pu 43.9 kN, grease limiting speed 2,100 r/min, oil 2,600 r/min, mass about 9410 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23222EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23222EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23222EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23222EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23222EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23222EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 752 kN C / 869 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23222EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23222EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23222emd1",
      "＊23222emd1",
      "23222EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23222EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23222EMKD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 200,
    "B_mm": 69.8,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 752,
    "static_load_kN": 869,
    "fatigue_load_limit_kN": 43.9,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2600,
    "weight_g": 9140,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23222EMKD1 belongs to the 23200 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. Reading the full code: the number gives the 110×200 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. NTN prints two speeds for 23222EMKD1: 2,100 r/min grease and 2,600 r/min oil — the gap of 500 r/min reflects oil cooling of the heavy roller set. The 45.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 69.8 mm-wide ring seats fully on both sides. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 110 mm set.",
    "applications": [
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Mount the 110 mm ring with induction heat or the sleeve drive-up procedure; at 9140 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Never substitute 23222EMKD1 by envelope alone: the 869 kN C0 and 43.9 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Oil relubrication toward 2,600 r/min needs drain and level design; flooding the 69.8 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 110 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Oil relubrication toward 2,600 r/min needs drain and level design; flooding the 69.8 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 752/869 kN ratings, 43.9 kN Pu and 9140 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23222EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23222EMKD1?",
        "a": "23222EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 110 mm bore, 200 mm OD and 69.8 mm width (4.331 × 7.874 × 2.748 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 752 kN, C0 869 kN, Pu 43.9 kN, grease limiting speed 2,100 r/min, oil 2,600 r/min, mass about 9140 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23222EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23222EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23222EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23222EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23222EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23222EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 752 kN C / 869 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23222EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23222EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23222emkd1",
      "＊23222emkd1",
      "23222EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21322-NTN",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21322",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 240,
    "B_mm": 50,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 550,
    "static_load_kN": 615,
    "fatigue_load_limit_kN": 61.5,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2300,
    "weight_g": 11200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "21322 is the C design-code execution of NTN's spherical roller range for a 110 mm shaft — 550 kN basic dynamic capacity in a 11200 g, open ISO 15 envelope. Reading the full code: the number gives the 110×240 mm envelope, C/CK names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and plain outer ring (no D1/W33 groove) completes the order number. At 550 kN C and 11200 g mass the 21300 series part is built for shock and vibration; the 50 mm-wide ring needs square abutments to keep both rows equally loaded. 110 mm bore is 4.331 in and 240 mm OD is 9.449 in; the ISO 15 envelope swaps between brands, but the 550/615 kN ratings and cage design are NTN 2203E values. Fillet radii on shaft and housing must clear the ring chamfers of the 50 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Mount the 110 mm ring with induction heat or the sleeve drive-up procedure; at 11200 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 50 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 50 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 50 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,800 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 550/615 kN ratings, 61.5 kN Pu and 11200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21322 (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21322?",
        "a": "21322 is an NTN double-row spherical roller bearing to ISO 15: 110 mm bore, 240 mm OD and 50 mm width (4.331 × 9.449 × 1.969 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 550 kN, C0 615 kN, Pu 61.5 kN, grease limiting speed 1,800 r/min, oil 2,300 r/min, mass about 11200 g. It is open, with pressed-steel cage of the 213-series C design."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "21322 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 21322K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21322 is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21322?",
        "a": "21322 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21322 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 550 kN C / 615 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21322",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "21322K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 21322K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21322",
      "21322-NTN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21322K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21322K",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 240,
    "B_mm": 50,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 550,
    "static_load_kN": 615,
    "fatigue_load_limit_kN": 61.5,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2300,
    "weight_g": 11100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "21322K is the C design-code execution of NTN's spherical roller range for a 110 mm shaft — 550 kN basic dynamic capacity in a 11100 g, open ISO 15 envelope. Numbering ties 21322K to its envelope and execution: same-number EA versus EM or plain variants share the 110 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Suffix reading on 21322K: C is the cage/design code for the NTN 213 series, CK adding the tapered bore; K marks the 1:12 tapered bore; quote the full code because each suffix is a distinct article. Catalogue mass 11100 g (11.10 kg) for the 110×240×50 mm execution includes the C design-code cage and both roller rows; shaft and housing shoulders must support that ring squarely. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 21322K leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Mount the 110 mm ring with induction heat or the sleeve drive-up procedure; at 11100 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Never substitute 21322K by envelope alone: the 615 kN C0 and 61.5 kN Pu are specific to the NTN C design-code execution, and vibrating duty depends heavily on cage identity.",
      "Do not confuse EA and EM at the same number: 21322K carries C design-code; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 110×240 mm envelope is identical.",
      "Oil relubrication toward 2,300 r/min needs drain and level design; flooding the 50 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 50 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 550/615 kN ratings, 61.5 kN Pu and 11100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21322K (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21322K?",
        "a": "21322K is an NTN double-row spherical roller bearing to ISO 15: 110 mm bore, 240 mm OD and 50 mm width (4.331 × 9.449 × 1.969 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 550 kN, C0 615 kN, Pu 61.5 kN, grease limiting speed 1,800 r/min, oil 2,300 r/min, mass about 11100 g. It is open, with pressed-steel cage of the 213-series C design and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 21322K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 21322."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21322K is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21322K?",
        "a": "21322K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21322K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 550 kN C / 615 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21322-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 21322-NTN — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21322k",
      "21322K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22322EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22322EAD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 240,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 975,
    "static_load_kN": 972,
    "fatigue_load_limit_kN": 59,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2400,
    "weight_g": 17000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 110 mm shaft, NTN supplies 22322EAD1: sphered outer raceway, two roller rows, pressed sheet-steel window cage (EA high-capacity design), oil speed 2,400 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (cylindrical), lubrication feature (D1); 22322EAD1 is assembled exactly in that order. Suffix reading on 22322EAD1: EA identifies the high-capacity execution with a pressed sheet-steel window cage; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. The 65.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 80 mm-wide ring seats fully on both sides. Fillet radii on shaft and housing must clear the ring chamfers of the 80 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Mount the 110 mm ring with induction heat or the sleeve drive-up procedure; at 17000 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,000 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 110 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Never substitute 22322EAD1 by envelope alone: the 972 kN C0 and 59 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 80 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 975/972 kN ratings, 59 kN Pu and 17000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22322EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22322EAD1?",
        "a": "22322EAD1 is an NTN double-row spherical roller bearing to ISO 15: 110 mm bore, 240 mm OD and 80 mm width (4.331 × 9.449 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 975 kN, C0 972 kN, Pu 59 kN, grease limiting speed 2,000 r/min, oil 2,400 r/min, mass about 17000 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22322EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22322EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22322EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22322EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22322EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22322EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 975 kN C / 972 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22322EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22322EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22322ead1",
      "＊22322ead1",
      "22322EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22322EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22322EAKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 240,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 975,
    "static_load_kN": 972,
    "fatigue_load_limit_kN": 59,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2400,
    "weight_g": 16600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22322EAKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 110 mm bore, 240 mm OD, 80 mm width, rated 2,000 r/min on grease. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (K), lubrication feature (D1); 22322EAKD1 is assembled exactly in that order. NTN prints two speeds for 22322EAKD1: 2,000 r/min grease and 2,400 r/min oil — the gap of 400 r/min reflects oil cooling of the heavy roller set. Grease/oil ratio: the 2,000 r/min limiting value is .83 of the 2,400 r/min oil value; heavy 80 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Mount 22322EAKD1 on its adapter or withdrawal sleeve on the 110 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Mount the 110 mm ring with induction heat or the sleeve drive-up procedure; at 16600 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22322EAD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 110 mm bearing, and drive-up procedures differ.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22322EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Oil relubrication toward 2,400 r/min needs drain and level design; flooding the 80 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 975/972 kN ratings, 59 kN Pu and 16600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22322EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22322EAKD1?",
        "a": "22322EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 110 mm bore, 240 mm OD and 80 mm width (4.331 × 9.449 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 975 kN, C0 972 kN, Pu 59 kN, grease limiting speed 2,000 r/min, oil 2,400 r/min, mass about 16600 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22322EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22322EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22322EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22322EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22322EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22322EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 975 kN C / 972 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22322EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22322EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22322eakd1",
      "＊22322eakd1",
      "22322EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22322EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22322EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 240,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 975,
    "static_load_kN": 972,
    "fatigue_load_limit_kN": 59,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2400,
    "weight_g": 17400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22322EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 110 mm bore, 240 mm OD, 80 mm width, rated 2,000 r/min on grease. Numbering ties 22322EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 110 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. The 65.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 80 mm-wide ring seats fully on both sides. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "Mount the 110 mm ring with induction heat or the sleeve drive-up procedure; at 17400 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Do not confuse EA and EM at the same number: 22322EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 110×240 mm envelope is identical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,000 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Do not confuse EA and EM at the same number: 22322EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 110×240 mm envelope is identical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 110 mm bearing, and drive-up procedures differ.",
      "The 975/972 kN ratings, 59 kN Pu and 17400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22322EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22322EMD1?",
        "a": "22322EMD1 is an NTN double-row spherical roller bearing to ISO 15: 110 mm bore, 240 mm OD and 80 mm width (4.331 × 9.449 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 975 kN, C0 972 kN, Pu 59 kN, grease limiting speed 2,000 r/min, oil 2,400 r/min, mass about 17400 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22322EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22322EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22322EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22322EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22322EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22322EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 975 kN C / 972 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22322EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22322EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22322emd1",
      "＊22322emd1",
      "22322EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22322EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22322EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 240,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 975,
    "static_load_kN": 972,
    "fatigue_load_limit_kN": 59,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2400,
    "weight_g": 17100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22322EMKD1 belongs to the 22300 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (22300 series); the bore code resolves to 110 mm (two-digit code ×5, with the 00–03 exception table), and 240 mm OD / 80 mm width follow the general plan. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. Grease/oil ratio: the 2,000 r/min limiting value is .83 of the 2,400 r/min oil value; heavy 80 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Mount 22322EMKD1 on its adapter or withdrawal sleeve on the 110 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "Mount the 110 mm ring with induction heat or the sleeve drive-up procedure; at 17100 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 80 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,000 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 80 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 22322EMKD1 by envelope alone: the 972 kN C0 and 59 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 975/972 kN ratings, 59 kN Pu and 17100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22322EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22322EMKD1?",
        "a": "22322EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 110 mm bore, 240 mm OD and 80 mm width (4.331 × 9.449 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 975 kN, C0 972 kN, Pu 59 kN, grease limiting speed 2,000 r/min, oil 2,400 r/min, mass about 17100 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22322EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22322EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22322EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22322EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22322EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22322EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 975 kN C / 972 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22322EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22322EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22322emkd1",
      "＊22322emkd1",
      "22322EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23024EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23024EAD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 180,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 446,
    "static_load_kN": 577,
    "fatigue_load_limit_kN": 35.8,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 3100,
    "weight_g": 4020,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23024EAD1 identifies a 120×180×46 mm (4.724 × 7.087 × 1.811 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 120 mm bore; the 46 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Two symmetric roller rows share the load: C 446 kN, C0 577 kN (C0/C ≈ 1.29), with useful axial capacity in either direction alongside the dominant radial load. Selection: the C0/C ratio of 1.29 (577/446 kN) reflects the heavy static and shock proportioning of 23024EAD1; size the equivalent load at the required L10 with shock factor for the application. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 120 mm bore 23024EAD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 446 kN rating no longer applies.",
      "Never substitute 23024EAD1 by envelope alone: the 577 kN C0 and 35.8 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,400 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 120 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 446/577 kN ratings, 35.8 kN Pu and 4020 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23024EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23024EAD1?",
        "a": "23024EAD1 is an NTN double-row spherical roller bearing to ISO 15: 120 mm bore, 180 mm OD and 46 mm width (4.724 × 7.087 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 446 kN, C0 577 kN, Pu 35.8 kN, grease limiting speed 2,400 r/min, oil 3,100 r/min, mass about 4020 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23024EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23024EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23024EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23024EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23024EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23024EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 446 kN C / 577 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23024EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23024EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23024ead1",
      "＊23024ead1",
      "23024EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23024EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23024EAKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 180,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 446,
    "static_load_kN": 577,
    "fatigue_load_limit_kN": 35.8,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 3100,
    "weight_g": 3900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23024EAKD1 identifies a 120×180×46 mm (4.724 × 7.087 × 1.811 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 120 mm bore; the 46 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. The 30.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 46 mm-wide ring seats fully on both sides. Fillet radii on shaft and housing must clear the ring chamfers of the 46 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 120 mm bore 23024EAKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 446 kN rating no longer applies.",
      "Never substitute 23024EAKD1 by envelope alone: the 577 kN C0 and 35.8 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 446 kN rating no longer applies.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23024EAKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 446/577 kN ratings, 35.8 kN Pu and 3900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23024EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23024EAKD1?",
        "a": "23024EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 120 mm bore, 180 mm OD and 46 mm width (4.724 × 7.087 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 446 kN, C0 577 kN, Pu 35.8 kN, grease limiting speed 2,400 r/min, oil 3,100 r/min, mass about 3900 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23024EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23024EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23024EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23024EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23024EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23024EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 446 kN C / 577 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23024EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23024EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23024eakd1",
      "＊23024eakd1",
      "23024EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23024EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23024EMD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 180,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 446,
    "static_load_kN": 577,
    "fatigue_load_limit_kN": 35.8,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 3100,
    "weight_g": 4020,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23024EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 120 mm shaft — 446 kN basic dynamic capacity in a 4020 g, open ISO 15 envelope. Reading the full code: the number gives the 120×180 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. Two symmetric roller rows share the load: C 446 kN, C0 577 kN (C0/C ≈ 1.29), with useful axial capacity in either direction alongside the dominant radial load. Speed planning: 2,400 r/min grease limiting speed is the cage/kinematic ceiling and 3,100 r/min is the oil-lubricated value for the 120 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Never mount 23024EMD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 180 mm race.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 120 mm bore 23024EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 3,100 r/min needs drain and level design; flooding the 46 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 120 mm bearing, and drive-up procedures differ.",
      "Do not confuse EA and EM at the same number: 23024EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 120×180 mm envelope is identical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 120 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 446/577 kN ratings, 35.8 kN Pu and 4020 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23024EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23024EMD1?",
        "a": "23024EMD1 is an NTN double-row spherical roller bearing to ISO 15: 120 mm bore, 180 mm OD and 46 mm width (4.724 × 7.087 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 446 kN, C0 577 kN, Pu 35.8 kN, grease limiting speed 2,400 r/min, oil 3,100 r/min, mass about 4020 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23024EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23024EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23024EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23024EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23024EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23024EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 446 kN C / 577 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23024EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23024EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23024emd1",
      "＊23024emd1",
      "23024EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23024EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23024EMKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 180,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 446,
    "static_load_kN": 577,
    "fatigue_load_limit_kN": 35.8,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 3100,
    "weight_g": 3900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23024EMKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 120 mm bore, 180 mm OD, 46 mm width, rated 2,400 r/min on grease. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 23024EMKD1 is assembled exactly in that order. Pu 35.8 kN is the catalogue fatigue load limit for 23024EMKD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. The 30.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 46 mm-wide ring seats fully on both sides. Fillet radii on shaft and housing must clear the ring chamfers of the 46 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 120 mm bore 23024EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23024EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 120 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23024EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23024EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 446/577 kN ratings, 35.8 kN Pu and 3900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23024EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23024EMKD1?",
        "a": "23024EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 120 mm bore, 180 mm OD and 46 mm width (4.724 × 7.087 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 446 kN, C0 577 kN, Pu 35.8 kN, grease limiting speed 2,400 r/min, oil 3,100 r/min, mass about 3900 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23024EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23024EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23024EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23024EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23024EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23024EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 446 kN C / 577 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23024EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23024EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23024emkd1",
      "＊23024emkd1",
      "23024EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24024EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24024EMD1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 180,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 526,
    "static_load_kN": 726,
    "fatigue_load_limit_kN": 34.4,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2600,
    "weight_g": 5280,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 24024EMD1 identifies a 120×180×60 mm (4.724 × 7.087 × 2.362 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 24024EMD1 is assembled exactly in that order. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. Equivalent-load planning keeps a radial plus moderate axial combination on 24024EMD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 24024EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 120 mm bore 24024EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The cylindrical-bore 24024EMD1 and its tapered-bore counterpart 24024EMK30D1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 120 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Do not confuse EA and EM at the same number: 24024EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 120×180 mm envelope is identical.",
      "Never substitute 24024EMD1 by envelope alone: the 726 kN C0 and 34.4 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 526/726 kN ratings, 34.4 kN Pu and 5280 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24024EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24024EMD1?",
        "a": "24024EMD1 is an NTN double-row spherical roller bearing to ISO 15: 120 mm bore, 180 mm OD and 60 mm width (4.724 × 7.087 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 526 kN, C0 726 kN, Pu 34.4 kN, grease limiting speed 2,100 r/min, oil 2,600 r/min, mass about 5280 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24024EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24024EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24024EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24024EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24024EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24024EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 526 kN C / 726 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24024EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24024EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24024emd1",
      "＊24024emd1",
      "24024EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24024EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24024EMK30D1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 180,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 526,
    "static_load_kN": 726,
    "fatigue_load_limit_kN": 34.4,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2600,
    "weight_g": 5210,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 24024EMK30D1 with a 1:30 tapered bore (K30) and D1 outer-ring annular oil groove with holes: 120 mm bore, 180 mm OD, 60 mm width, rated 2,100 r/min on grease. Digit by digit the code reads as spherical-roller dimension series plus 120 mm bore; the 60 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Pu 34.4 kN is the catalogue fatigue load limit for 24024EMK30D1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. The 30.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 60 mm-wide ring seats fully on both sides. Fillet radii on shaft and housing must clear the ring chamfers of the 60 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 120 mm bore 24024EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 24024EMK30D1 by envelope alone: the 726 kN C0 and 34.4 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 60 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Do not confuse EA and EM at the same number: 24024EMK30D1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 120×180 mm envelope is identical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24024EMK30D1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 526/726 kN ratings, 34.4 kN Pu and 5210 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24024EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24024EMK30D1?",
        "a": "24024EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 120 mm bore, 180 mm OD and 60 mm width (4.724 × 7.087 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 526 kN, C0 726 kN, Pu 34.4 kN, grease limiting speed 2,100 r/min, oil 2,600 r/min, mass about 5210 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 24024EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 120 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24024EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24024EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24024EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24024EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24024EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 526 kN C / 726 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24024EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24024EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24024emk30d1",
      "＊24024emk30d1",
      "24024EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23124EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23124EAD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 200,
    "B_mm": 62,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 663,
    "static_load_kN": 820,
    "fatigue_load_limit_kN": 43.4,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2500,
    "weight_g": 7720,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23124EAD1 belongs to the 23100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (cylindrical), lubrication feature (D1); 23124EAD1 is assembled exactly in that order. At 663 kN C and 7720 g mass the 23100 series part is built for shock and vibration; the 62 mm-wide ring needs square abutments to keep both rows equally loaded. Pu 43.4 kN against C0 820 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23124EAD1 moves with cleanliness far more than with small C variations. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 120 mm bore 23124EAD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 2,500 r/min needs drain and level design; flooding the 62 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 62 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 62 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,000 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 663/820 kN ratings, 43.4 kN Pu and 7720 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23124EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23124EAD1?",
        "a": "23124EAD1 is an NTN double-row spherical roller bearing to ISO 15: 120 mm bore, 200 mm OD and 62 mm width (4.724 × 7.874 × 2.441 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 663 kN, C0 820 kN, Pu 43.4 kN, grease limiting speed 2,000 r/min, oil 2,500 r/min, mass about 7720 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23124EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23124EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23124EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23124EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23124EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23124EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 663 kN C / 820 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23124EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23124EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23124ead1",
      "＊23124ead1",
      "23124EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23124EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23124EAKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 200,
    "B_mm": 62,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 663,
    "static_load_kN": 820,
    "fatigue_load_limit_kN": 43.4,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2500,
    "weight_g": 7490,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23124EAKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 120×200×62 mm to ISO 15, with pressed sheet-steel window cage (EA high-capacity design). On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (K), lubrication feature (D1); 23124EAKD1 is assembled exactly in that order. Two symmetric roller rows share the load: C 663 kN, C0 820 kN (C0/C ≈ 1.24), with useful axial capacity in either direction alongside the dominant radial load. The 40.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 62 mm-wide ring seats fully on both sides. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 120 mm bore 23124EAKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 2,500 r/min needs drain and level design; flooding the 62 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Do not confuse EA and EM at the same number: 23124EAKD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 120×200 mm envelope is identical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23124EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 120 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 663/820 kN ratings, 43.4 kN Pu and 7490 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23124EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23124EAKD1?",
        "a": "23124EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 120 mm bore, 200 mm OD and 62 mm width (4.724 × 7.874 × 2.441 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 663 kN, C0 820 kN, Pu 43.4 kN, grease limiting speed 2,000 r/min, oil 2,500 r/min, mass about 7490 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23124EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23124EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23124EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23124EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23124EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23124EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 663 kN C / 820 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23124EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23124EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23124eakd1",
      "＊23124eakd1",
      "23124EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23124EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23124EMD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 200,
    "B_mm": 62,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 663,
    "static_load_kN": 820,
    "fatigue_load_limit_kN": 43.4,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2500,
    "weight_g": 7770,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 120 mm shaft, NTN supplies 23124EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 2,500 r/min. Numbering ties 23124EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 120 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The cylindrical bore fits a machined 120 mm shaft seat directly; the same envelope in 23124EMKD1 (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Pu 43.4 kN against C0 820 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23124EMD1 moves with cleanliness far more than with small C variations. Fit the cylindrical-bore 23124EMD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 120 mm bore 23124EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 23124EMD1 by envelope alone: the 820 kN C0 and 43.4 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 663 kN rating no longer applies.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23124EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Do not confuse EA and EM at the same number: 23124EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 120×200 mm envelope is identical.",
      "The 663/820 kN ratings, 43.4 kN Pu and 7770 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23124EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23124EMD1?",
        "a": "23124EMD1 is an NTN double-row spherical roller bearing to ISO 15: 120 mm bore, 200 mm OD and 62 mm width (4.724 × 7.874 × 2.441 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 663 kN, C0 820 kN, Pu 43.4 kN, grease limiting speed 2,000 r/min, oil 2,500 r/min, mass about 7770 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23124EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23124EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23124EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23124EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23124EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23124EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 663 kN C / 820 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23124EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23124EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23124emd1",
      "＊23124emd1",
      "23124EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23124EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23124EMKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 200,
    "B_mm": 62,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 663,
    "static_load_kN": 820,
    "fatigue_load_limit_kN": 43.4,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2500,
    "weight_g": 7540,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23124EMKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 120 mm bore, 200 mm OD, 62 mm width, rated 2,000 r/min on grease. The leading digits are the ISO 15 dimension series (23100 series); the bore code resolves to 120 mm (two-digit code ×5, with the 00–03 exception table), and 200 mm OD / 62 mm width follow the general plan. At 663 kN C and 7540 g mass the 23100 series part is built for shock and vibration; the 62 mm-wide ring needs square abutments to keep both rows equally loaded. Equivalent-load planning keeps a radial plus moderate axial combination on 23124EMKD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Fillet radii on shaft and housing must clear the ring chamfers of the 62 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 120 mm bore 23124EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,000 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Do not confuse EA and EM at the same number: 23124EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 120×200 mm envelope is identical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23124EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,000 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 663/820 kN ratings, 43.4 kN Pu and 7540 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23124EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23124EMKD1?",
        "a": "23124EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 120 mm bore, 200 mm OD and 62 mm width (4.724 × 7.874 × 2.441 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 663 kN, C0 820 kN, Pu 43.4 kN, grease limiting speed 2,000 r/min, oil 2,500 r/min, mass about 7540 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23124EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23124EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23124EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23124EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23124EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23124EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 663 kN C / 820 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23124EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23124EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23124emkd1",
      "＊23124emkd1",
      "23124EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24124EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24124EMD1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 200,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 756,
    "static_load_kN": 991,
    "fatigue_load_limit_kN": 41.3,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2500,
    "weight_g": 10000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24124EMD1 belongs to the 24100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 120 mm (two-digit code ×5, with the 00–03 exception table), and 200 mm OD / 80 mm width follow the general plan. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Selection: the C0/C ratio of 1.31 (991/756 kN) reflects the heavy static and shock proportioning of 24124EMD1; size the equivalent load at the required L10 with shock factor for the application. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 24124EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 120 mm bore 24124EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,900 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The cylindrical-bore 24124EMD1 and its tapered-bore counterpart 24124EMK30D1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 120 mm bearing, and drive-up procedures differ.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 120 mm bearing, and drive-up procedures differ.",
      "The 756/991 kN ratings, 41.3 kN Pu and 10000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24124EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24124EMD1?",
        "a": "24124EMD1 is an NTN double-row spherical roller bearing to ISO 15: 120 mm bore, 200 mm OD and 80 mm width (4.724 × 7.874 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 756 kN, C0 991 kN, Pu 41.3 kN, grease limiting speed 1,900 r/min, oil 2,500 r/min, mass about 10000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24124EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24124EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24124EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24124EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24124EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24124EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 756 kN C / 991 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24124EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24124EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24124emd1",
      "＊24124emd1",
      "24124EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24124EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24124EMK30D1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 200,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 756,
    "static_load_kN": 991,
    "fatigue_load_limit_kN": 41.3,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2500,
    "weight_g": 9870,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24124EMK30D1 belongs to the 24100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K30), lubrication feature (D1); 24124EMK30D1 is assembled exactly in that order. Pu 41.3 kN is the catalogue fatigue load limit for 24124EMK30D1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. 120 mm bore is 4.724 in and 200 mm OD is 7.874 in; the ISO 15 envelope swaps between brands, but the 756/991 kN ratings and cage design are NTN 2203E values. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 120 mm set.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 120 mm bore 24124EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,900 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24124EMK30D1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Oil relubrication toward 2,500 r/min needs drain and level design; flooding the 80 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24124EMK30D1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 756/991 kN ratings, 41.3 kN Pu and 9870 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24124EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24124EMK30D1?",
        "a": "24124EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 120 mm bore, 200 mm OD and 80 mm width (4.724 × 7.874 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 756 kN, C0 991 kN, Pu 41.3 kN, grease limiting speed 1,900 r/min, oil 2,500 r/min, mass about 9870 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24124EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 120 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24124EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24124EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24124EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24124EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24124EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 756 kN C / 991 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24124EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24124EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24124emk30d1",
      "＊24124emk30d1",
      "24124EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22224EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22224EAD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 215,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 688,
    "static_load_kN": 753,
    "fatigue_load_limit_kN": 49.9,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 3000,
    "weight_g": 8880,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22224EAD1 identifies a 120×215×58 mm (4.724 × 8.465 × 2.283 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (cylindrical), lubrication feature (D1); 22224EAD1 is assembled exactly in that order. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. With about 5.7 kN of C per millimetre of the 120 mm bore, 22224EAD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Fillet radii on shaft and housing must clear the ring chamfers of the 58 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 120 mm bore 22224EAD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 3,000 r/min needs drain and level design; flooding the 58 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 120 mm bearing, and drive-up procedures differ.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 120 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 120 mm bearing, and drive-up procedures differ.",
      "The 688/753 kN ratings, 49.9 kN Pu and 8880 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22224EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22224EAD1?",
        "a": "22224EAD1 is an NTN double-row spherical roller bearing to ISO 15: 120 mm bore, 215 mm OD and 58 mm width (4.724 × 8.465 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 688 kN, C0 753 kN, Pu 49.9 kN, grease limiting speed 2,400 r/min, oil 3,000 r/min, mass about 8880 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22224EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22224EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22224EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22224EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22224EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22224EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 688 kN C / 753 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22224EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22224EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22224ead1",
      "＊22224ead1",
      "22224EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22224EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22224EAKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 215,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 688,
    "static_load_kN": 753,
    "fatigue_load_limit_kN": 49.9,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 3000,
    "weight_g": 8680,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22224EAKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 120×215×58 mm to ISO 15, with pressed sheet-steel window cage (EA high-capacity design). Digit by digit the code reads as spherical-roller dimension series plus 120 mm bore; the 58 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. NTN prints two speeds for 22224EAKD1: 2,400 r/min grease and 3,000 r/min oil — the gap of 600 r/min reflects oil cooling of the heavy roller set. 120 mm bore is 4.724 in and 215 mm OD is 8.465 in; the ISO 15 envelope swaps between brands, but the 688/753 kN ratings and cage design are NTN 2203E values. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 120 mm bore 22224EAKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 22224EAKD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 120×215 mm envelope is identical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22224EAKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 120 mm bearing, and drive-up procedures differ.",
      "Oil relubrication toward 3,000 r/min needs drain and level design; flooding the 58 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 688/753 kN ratings, 49.9 kN Pu and 8680 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22224EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22224EAKD1?",
        "a": "22224EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 120 mm bore, 215 mm OD and 58 mm width (4.724 × 8.465 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 688 kN, C0 753 kN, Pu 49.9 kN, grease limiting speed 2,400 r/min, oil 3,000 r/min, mass about 8680 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22224EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22224EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22224EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22224EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22224EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22224EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 688 kN C / 753 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22224EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22224EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22224eakd1",
      "＊22224eakd1",
      "22224EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22224EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22224EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 215,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 688,
    "static_load_kN": 753,
    "fatigue_load_limit_kN": 49.9,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 3000,
    "weight_g": 9010,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22224EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 120 mm shaft — 688 kN basic dynamic capacity in a 9010 g, open ISO 15 envelope. Numbering ties 22224EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 120 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. With about 5.7 kN of C per millimetre of the 120 mm bore, 22224EMD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 120 mm bore 22224EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 22224EMD1 by envelope alone: the 753 kN C0 and 49.9 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Oil relubrication toward 3,000 r/min needs drain and level design; flooding the 58 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Never substitute 22224EMD1 by envelope alone: the 753 kN C0 and 49.9 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22224EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 688/753 kN ratings, 49.9 kN Pu and 9010 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22224EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22224EMD1?",
        "a": "22224EMD1 is an NTN double-row spherical roller bearing to ISO 15: 120 mm bore, 215 mm OD and 58 mm width (4.724 × 8.465 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 688 kN, C0 753 kN, Pu 49.9 kN, grease limiting speed 2,400 r/min, oil 3,000 r/min, mass about 9010 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22224EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22224EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22224EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22224EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22224EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22224EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 688 kN C / 753 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22224EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22224EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22224emd1",
      "＊22224emd1",
      "22224EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22224EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22224EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 215,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 688,
    "static_load_kN": 753,
    "fatigue_load_limit_kN": 49.9,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 3000,
    "weight_g": 8820,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 120 mm shaft, NTN supplies 22224EMKD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 3,000 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 22224EMKD1 is assembled exactly in that order. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. 120 mm bore is 4.724 in and 215 mm OD is 8.465 in; the ISO 15 envelope swaps between brands, but the 688/753 kN ratings and cage design are NTN 2203E values. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 120 mm bore 22224EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22224EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Do not confuse EA and EM at the same number: 22224EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 120×215 mm envelope is identical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,400 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Never substitute 22224EMKD1 by envelope alone: the 753 kN C0 and 49.9 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 688/753 kN ratings, 49.9 kN Pu and 8820 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22224EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22224EMKD1?",
        "a": "22224EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 120 mm bore, 215 mm OD and 58 mm width (4.724 × 8.465 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 688 kN, C0 753 kN, Pu 49.9 kN, grease limiting speed 2,400 r/min, oil 3,000 r/min, mass about 8820 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22224EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22224EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22224EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22224EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22224EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22224EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 688 kN C / 753 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22224EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22224EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22224emkd1",
      "＊22224emkd1",
      "22224EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23224EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23224EMD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 215,
    "B_mm": 76,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 857,
    "static_load_kN": 998,
    "fatigue_load_limit_kN": 49.8,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2400,
    "weight_g": 11700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23224EMD1 identifies a 120×215×76 mm (4.724 × 8.465 × 2.992 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 120 mm bore; the 76 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Two symmetric roller rows share the load: C 857 kN, C0 998 kN (C0/C ≈ 1.16), with useful axial capacity in either direction alongside the dominant radial load. With about 7.1 kN of C per millimetre of the 120 mm bore, 23224EMD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Fit the cylindrical-bore 23224EMD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 120 mm bore 23224EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The cylindrical-bore 23224EMD1 and its tapered-bore counterpart 23224EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,900 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 857 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 120 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 857/998 kN ratings, 49.8 kN Pu and 11700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23224EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23224EMD1?",
        "a": "23224EMD1 is an NTN double-row spherical roller bearing to ISO 15: 120 mm bore, 215 mm OD and 76 mm width (4.724 × 8.465 × 2.992 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 857 kN, C0 998 kN, Pu 49.8 kN, grease limiting speed 1,900 r/min, oil 2,400 r/min, mass about 11700 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23224EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23224EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23224EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23224EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23224EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23224EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 857 kN C / 998 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23224EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23224EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23224emd1",
      "＊23224emd1",
      "23224EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23224EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23224EMKD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 215,
    "B_mm": 76,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 857,
    "static_load_kN": 998,
    "fatigue_load_limit_kN": 49.8,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2400,
    "weight_g": 11300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 120 mm shaft, NTN supplies 23224EMKD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 2,400 r/min. Digit by digit the code reads as spherical-roller dimension series plus 120 mm bore; the 76 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Suffix reading on 23224EMKD1: EM identifies the high-capacity execution with a one-piece machined brass cage; K marks the 1:12 tapered bore; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. 120 mm bore is 4.724 in and 215 mm OD is 8.465 in; the ISO 15 envelope swaps between brands, but the 857/998 kN ratings and cage design are NTN 2203E values. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 120 mm bore 23224EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 76 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23224EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 76 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 76 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 857/998 kN ratings, 49.8 kN Pu and 11300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23224EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23224EMKD1?",
        "a": "23224EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 120 mm bore, 215 mm OD and 76 mm width (4.724 × 8.465 × 2.992 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 857 kN, C0 998 kN, Pu 49.8 kN, grease limiting speed 1,900 r/min, oil 2,400 r/min, mass about 11300 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23224EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23224EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23224EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23224EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23224EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23224EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 857 kN C / 998 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23224EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23224EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23224emkd1",
      "＊23224emkd1",
      "23224EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22324EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22324EAD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 260,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1170,
    "static_load_kN": 1280,
    "fatigue_load_limit_kN": 68.4,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2200,
    "weight_g": 22300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 120 mm shaft, NTN supplies 22324EAD1: sphered outer raceway, two roller rows, pressed sheet-steel window cage (EA high-capacity design), oil speed 2,200 r/min. Digit by digit the code reads as spherical-roller dimension series plus 120 mm bore; the 86 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. At 1170 kN C and 22300 g mass the 22300 series part is built for shock and vibration; the 86 mm-wide ring needs square abutments to keep both rows equally loaded. The 70.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 86 mm-wide ring seats fully on both sides. Fit the cylindrical-bore 22324EAD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 120 mm bore 22324EAD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 2,200 r/min needs drain and level design; flooding the 86 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The cylindrical-bore 22324EAD1 and its tapered-bore counterpart 22324EAKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Oil relubrication toward 2,200 r/min needs drain and level design; flooding the 86 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,800 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1170/1280 kN ratings, 68.4 kN Pu and 22300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22324EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22324EAD1?",
        "a": "22324EAD1 is an NTN double-row spherical roller bearing to ISO 15: 120 mm bore, 260 mm OD and 86 mm width (4.724 × 10.236 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1170 kN, C0 1280 kN, Pu 68.4 kN, grease limiting speed 1,800 r/min, oil 2,200 r/min, mass about 22300 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22324EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22324EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22324EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22324EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22324EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22324EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1170 kN C / 1280 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22324EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22324EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22324ead1",
      "＊22324ead1",
      "22324EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22324EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22324EAKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 260,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1170,
    "static_load_kN": 1280,
    "fatigue_load_limit_kN": 68.4,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2200,
    "weight_g": 21900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22324EAKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 120 mm bore, 260 mm OD, 86 mm width, rated 1,800 r/min on grease. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (K), lubrication feature (D1); 22324EAKD1 is assembled exactly in that order. The 70.0 mm radial section over the 120 mm bore carries two roller rows; capacity per millimetre of bore is about 9.8 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. 120 mm bore is 4.724 in and 260 mm OD is 10.236 in; the ISO 15 envelope swaps between brands, but the 1170/1280 kN ratings and cage design are NTN 2203E values. Mount 22324EAKD1 on its adapter or withdrawal sleeve on the 120 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 120 mm bore 22324EAKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 86 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1170 kN rating no longer applies.",
      "Do not confuse EA and EM at the same number: 22324EAKD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 120×260 mm envelope is identical.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22324EAD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 1170/1280 kN ratings, 68.4 kN Pu and 21900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22324EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22324EAKD1?",
        "a": "22324EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 120 mm bore, 260 mm OD and 86 mm width (4.724 × 10.236 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1170 kN, C0 1280 kN, Pu 68.4 kN, grease limiting speed 1,800 r/min, oil 2,200 r/min, mass about 21900 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22324EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22324EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22324EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22324EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22324EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22324EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1170 kN C / 1280 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22324EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22324EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22324eakd1",
      "＊22324eakd1",
      "22324EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22324EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22324EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 260,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1170,
    "static_load_kN": 1280,
    "fatigue_load_limit_kN": 68.4,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2200,
    "weight_g": 22700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22324EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 120 mm bore, 260 mm OD, 86 mm width, rated 1,800 r/min on grease. Digit by digit the code reads as spherical-roller dimension series plus 120 mm bore; the 86 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The cylindrical bore fits a machined 120 mm shaft seat directly; the same envelope in 22324EMKD1 (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Grease/oil ratio: the 1,800 r/min limiting value is .82 of the 2,200 r/min oil value; heavy 86 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22324EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 120 mm bore 22324EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The cylindrical-bore 22324EMD1 and its tapered-bore counterpart 22324EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22324EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,800 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Do not confuse EA and EM at the same number: 22324EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 120×260 mm envelope is identical.",
      "The 1170/1280 kN ratings, 68.4 kN Pu and 22700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22324EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22324EMD1?",
        "a": "22324EMD1 is an NTN double-row spherical roller bearing to ISO 15: 120 mm bore, 260 mm OD and 86 mm width (4.724 × 10.236 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1170 kN, C0 1280 kN, Pu 68.4 kN, grease limiting speed 1,800 r/min, oil 2,200 r/min, mass about 22700 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22324EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22324EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22324EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22324EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22324EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22324EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1170 kN C / 1280 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22324EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22324EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22324emd1",
      "＊22324emd1",
      "22324EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22324EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22324EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 260,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1170,
    "static_load_kN": 1280,
    "fatigue_load_limit_kN": 68.4,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2200,
    "weight_g": 22200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22324EMKD1 belongs to the 22300 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (22300 series); the bore code resolves to 120 mm (two-digit code ×5, with the 00–03 exception table), and 260 mm OD / 86 mm width follow the general plan. The 1:12 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 120 mm bore assembly. With about 9.8 kN of C per millimetre of the 120 mm bore, 22324EMKD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 120 mm set.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 120 mm bore 22324EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22324EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22324EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,800 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Do not confuse EA and EM at the same number: 22324EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 120×260 mm envelope is identical.",
      "The 1170/1280 kN ratings, 68.4 kN Pu and 22200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22324EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22324EMKD1?",
        "a": "22324EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 120 mm bore, 260 mm OD and 86 mm width (4.724 × 10.236 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1170 kN, C0 1280 kN, Pu 68.4 kN, grease limiting speed 1,800 r/min, oil 2,200 r/min, mass about 22200 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22324EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22324EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22324EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22324EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22324EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22324EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1170 kN C / 1280 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22324EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22324EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22324emkd1",
      "＊22324emkd1",
      "22324EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23026EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23026EAD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 200,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 565,
    "static_load_kN": 721,
    "fatigue_load_limit_kN": 44.2,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2900,
    "weight_g": 5880,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23026EAD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 130×200×52 mm to ISO 15, with pressed sheet-steel window cage (EA high-capacity design). On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (cylindrical), lubrication feature (D1); 23026EAD1 is assembled exactly in that order. The cylindrical bore fits a machined 130 mm shaft seat directly; the same envelope in 23026EAKD1 (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Equivalent-load planning keeps a radial plus moderate axial combination on 23026EAD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 130 mm bore 23026EAD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23026EAD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The cylindrical-bore 23026EAD1 and its tapered-bore counterpart 23026EAKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The cylindrical-bore 23026EAD1 and its tapered-bore counterpart 23026EAKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Do not confuse EA and EM at the same number: 23026EAD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 130×200 mm envelope is identical.",
      "The 565/721 kN ratings, 44.2 kN Pu and 5880 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23026EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23026EAD1?",
        "a": "23026EAD1 is an NTN double-row spherical roller bearing to ISO 15: 130 mm bore, 200 mm OD and 52 mm width (5.118 × 7.874 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 565 kN, C0 721 kN, Pu 44.2 kN, grease limiting speed 2,200 r/min, oil 2,900 r/min, mass about 5880 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23026EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23026EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23026EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23026EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23026EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23026EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 565 kN C / 721 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23026EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23026EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23026ead1",
      "＊23026ead1",
      "23026EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23026EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23026EAKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 200,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 565,
    "static_load_kN": 721,
    "fatigue_load_limit_kN": 44.2,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2900,
    "weight_g": 5710,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23026EAKD1 is the EA pressed-steel-cage execution of NTN's spherical roller range for a 130 mm shaft — 565 kN basic dynamic capacity in a 5710 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 130 mm bore; the 52 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EA pressed-steel-cage cage. Equivalent-load planning keeps a radial plus moderate axial combination on 23026EAKD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Mount 23026EAKD1 on its adapter or withdrawal sleeve on the 130 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 130 mm bore 23026EAKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23026EAD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23026EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 130 mm bearing, and drive-up procedures differ.",
      "Never substitute 23026EAKD1 by envelope alone: the 721 kN C0 and 44.2 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 565/721 kN ratings, 44.2 kN Pu and 5710 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23026EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23026EAKD1?",
        "a": "23026EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 130 mm bore, 200 mm OD and 52 mm width (5.118 × 7.874 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 565 kN, C0 721 kN, Pu 44.2 kN, grease limiting speed 2,200 r/min, oil 2,900 r/min, mass about 5710 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23026EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23026EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23026EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23026EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23026EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23026EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 565 kN C / 721 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23026EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23026EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23026eakd1",
      "＊23026eakd1",
      "23026EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23026EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23026EMD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 200,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 565,
    "static_load_kN": 721,
    "fatigue_load_limit_kN": 44.2,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2900,
    "weight_g": 5900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23026EMD1 identifies a 130×200×52 mm (5.118 × 7.874 × 2.047 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Numbering ties 23026EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 130 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Suffix reading on 23026EMD1: EM identifies the high-capacity execution with a one-piece machined brass cage; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. Equivalent-load planning keeps a radial plus moderate axial combination on 23026EMD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Fit the cylindrical-bore 23026EMD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 130 mm bore 23026EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 130 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23026EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 52 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 52 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 565/721 kN ratings, 44.2 kN Pu and 5900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23026EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23026EMD1?",
        "a": "23026EMD1 is an NTN double-row spherical roller bearing to ISO 15: 130 mm bore, 200 mm OD and 52 mm width (5.118 × 7.874 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 565 kN, C0 721 kN, Pu 44.2 kN, grease limiting speed 2,200 r/min, oil 2,900 r/min, mass about 5900 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23026EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23026EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23026EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23026EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23026EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23026EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 565 kN C / 721 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23026EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23026EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23026emd1",
      "＊23026emd1",
      "23026EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23026EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23026EMKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 200,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 565,
    "static_load_kN": 721,
    "fatigue_load_limit_kN": 44.2,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2900,
    "weight_g": 5730,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23026EMKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 130×200×52 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 23026EMKD1 is assembled exactly in that order. The 35.0 mm radial section over the 130 mm bore carries two roller rows; capacity per millimetre of bore is about 4.3 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Equivalent-load planning keeps a radial plus moderate axial combination on 23026EMKD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Mount 23026EMKD1 on its adapter or withdrawal sleeve on the 130 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 130 mm bore 23026EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 52 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 52 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,200 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23026EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 565/721 kN ratings, 44.2 kN Pu and 5730 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23026EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23026EMKD1?",
        "a": "23026EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 130 mm bore, 200 mm OD and 52 mm width (5.118 × 7.874 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 565 kN, C0 721 kN, Pu 44.2 kN, grease limiting speed 2,200 r/min, oil 2,900 r/min, mass about 5730 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23026EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23026EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23026EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23026EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23026EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23026EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 565 kN C / 721 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23026EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23026EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23026emkd1",
      "＊23026emkd1",
      "23026EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24026EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24026EMD1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 200,
    "B_mm": 69,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 682,
    "static_load_kN": 936,
    "fatigue_load_limit_kN": 42.2,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2400,
    "weight_g": 7820,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24026EMD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 130×200×69 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). The leading digits are the ISO 15 dimension series (24000 series); the bore code resolves to 130 mm (two-digit code ×5, with the 00–03 exception table), and 200 mm OD / 69 mm width follow the general plan. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. 130 mm bore is 5.118 in and 200 mm OD is 7.874 in; the ISO 15 envelope swaps between brands, but the 682/936 kN ratings and cage design are NTN 2203E values. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 24026EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 130 mm bore 24026EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 2,400 r/min needs drain and level design; flooding the 69 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 682 kN rating no longer applies.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,900 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24026EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 682/936 kN ratings, 42.2 kN Pu and 7820 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24026EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24026EMD1?",
        "a": "24026EMD1 is an NTN double-row spherical roller bearing to ISO 15: 130 mm bore, 200 mm OD and 69 mm width (5.118 × 7.874 × 2.717 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 682 kN, C0 936 kN, Pu 42.2 kN, grease limiting speed 1,900 r/min, oil 2,400 r/min, mass about 7820 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24026EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24026EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24026EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24026EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24026EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24026EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 682 kN C / 936 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24026EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24026EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24026emd1",
      "＊24026emd1",
      "24026EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24026EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24026EMK30D1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 200,
    "B_mm": 69,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 682,
    "static_load_kN": 936,
    "fatigue_load_limit_kN": 42.2,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2400,
    "weight_g": 7710,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 130 mm shaft, NTN supplies 24026EMK30D1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 2,400 r/min. Numbering ties 24026EMK30D1 to its envelope and execution: same-number EA versus EM or plain variants share the 130 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Suffix reading on 24026EMK30D1: EM identifies the high-capacity execution with a one-piece machined brass cage; K30 marks the 1:30 tapered bore of the wide series; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. 130 mm bore is 5.118 in and 200 mm OD is 7.874 in; the ISO 15 envelope swaps between brands, but the 682/936 kN ratings and cage design are NTN 2203E values. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 130 mm bore 24026EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 24026EMK30D1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 130×200 mm envelope is identical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,900 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 24026EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 69 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 682/936 kN ratings, 42.2 kN Pu and 7710 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24026EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24026EMK30D1?",
        "a": "24026EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 130 mm bore, 200 mm OD and 69 mm width (5.118 × 7.874 × 2.717 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 682 kN, C0 936 kN, Pu 42.2 kN, grease limiting speed 1,900 r/min, oil 2,400 r/min, mass about 7710 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 24026EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 130 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24026EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24026EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24026EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24026EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24026EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 682 kN C / 936 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24026EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24026EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24026emk30d1",
      "＊24026emk30d1",
      "24026EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23126EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23126EAD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 210,
    "B_mm": 64,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 710,
    "static_load_kN": 906,
    "fatigue_load_limit_kN": 47.1,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2400,
    "weight_g": 8450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23126EAD1 belongs to the 23100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (23100 series); the bore code resolves to 130 mm (two-digit code ×5, with the 00–03 exception table), and 210 mm OD / 64 mm width follow the general plan. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EA pressed-steel-cage cage. Selection: the C0/C ratio of 1.28 (906/710 kN) reflects the heavy static and shock proportioning of 23126EAD1; size the equivalent load at the required L10 with shock factor for the application. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 23126EAD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 130 mm bore 23126EAD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 130 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 130 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Do not confuse EA and EM at the same number: 23126EAD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 130×210 mm envelope is identical.",
      "Never substitute 23126EAD1 by envelope alone: the 906 kN C0 and 47.1 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 710/906 kN ratings, 47.1 kN Pu and 8450 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23126EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23126EAD1?",
        "a": "23126EAD1 is an NTN double-row spherical roller bearing to ISO 15: 130 mm bore, 210 mm OD and 64 mm width (5.118 × 8.268 × 2.52 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 710 kN, C0 906 kN, Pu 47.1 kN, grease limiting speed 1,900 r/min, oil 2,400 r/min, mass about 8450 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23126EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23126EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23126EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23126EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23126EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23126EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 710 kN C / 906 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23126EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23126EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23126ead1",
      "＊23126ead1",
      "23126EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23126EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23126EAKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 210,
    "B_mm": 64,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 710,
    "static_load_kN": 906,
    "fatigue_load_limit_kN": 47.1,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2400,
    "weight_g": 8190,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23126EAKD1 identifies a 130×210×64 mm (5.118 × 8.268 × 2.52 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Reading the full code: the number gives the 130×210 mm envelope, EA names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. At 710 kN C and 8190 g mass the 23100 series part is built for shock and vibration; the 64 mm-wide ring needs square abutments to keep both rows equally loaded. 130 mm bore is 5.118 in and 210 mm OD is 8.268 in; the ISO 15 envelope swaps between brands, but the 710/906 kN ratings and cage design are NTN 2203E values. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 23126EAKD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 130 mm bore 23126EAKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 23126EAKD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 130×210 mm envelope is identical.",
      "Oil relubrication toward 2,400 r/min needs drain and level design; flooding the 64 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Do not confuse EA and EM at the same number: 23126EAKD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 130×210 mm envelope is identical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,900 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 710/906 kN ratings, 47.1 kN Pu and 8190 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23126EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23126EAKD1?",
        "a": "23126EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 130 mm bore, 210 mm OD and 64 mm width (5.118 × 8.268 × 2.52 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 710 kN, C0 906 kN, Pu 47.1 kN, grease limiting speed 1,900 r/min, oil 2,400 r/min, mass about 8190 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23126EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23126EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23126EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23126EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23126EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23126EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 710 kN C / 906 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23126EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23126EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23126eakd1",
      "＊23126eakd1",
      "23126EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23126EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23126EMD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 210,
    "B_mm": 64,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 710,
    "static_load_kN": 906,
    "fatigue_load_limit_kN": 47.1,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2400,
    "weight_g": 8510,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 130 mm shaft, NTN supplies 23126EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 2,400 r/min. Digit by digit the code reads as spherical-roller dimension series plus 130 mm bore; the 64 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The 40.0 mm radial section over the 130 mm bore carries two roller rows; capacity per millimetre of bore is about 5.5 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Selection: the C0/C ratio of 1.28 (906/710 kN) reflects the heavy static and shock proportioning of 23126EMD1; size the equivalent load at the required L10 with shock factor for the application. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 130 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 130 mm bore 23126EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 710 kN rating no longer applies.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,900 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23126EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The cylindrical-bore 23126EMD1 and its tapered-bore counterpart 23126EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 710/906 kN ratings, 47.1 kN Pu and 8510 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23126EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23126EMD1?",
        "a": "23126EMD1 is an NTN double-row spherical roller bearing to ISO 15: 130 mm bore, 210 mm OD and 64 mm width (5.118 × 8.268 × 2.52 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 710 kN, C0 906 kN, Pu 47.1 kN, grease limiting speed 1,900 r/min, oil 2,400 r/min, mass about 8510 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23126EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23126EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23126EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23126EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23126EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23126EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 710 kN C / 906 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23126EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23126EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23126emd1",
      "＊23126emd1",
      "23126EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23126EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23126EMKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 210,
    "B_mm": 64,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 710,
    "static_load_kN": 906,
    "fatigue_load_limit_kN": 47.1,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2400,
    "weight_g": 8250,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23126EMKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 130 mm bore, 210 mm OD, 64 mm width, rated 1,900 r/min on grease. The leading digits are the ISO 15 dimension series (23100 series); the bore code resolves to 130 mm (two-digit code ×5, with the 00–03 exception table), and 210 mm OD / 64 mm width follow the general plan. Suffix reading on 23126EMKD1: EM identifies the high-capacity execution with a one-piece machined brass cage; K marks the 1:12 tapered bore; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. Grease/oil ratio: the 1,900 r/min limiting value is .79 of the 2,400 r/min oil value; heavy 64 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Fillet radii on shaft and housing must clear the ring chamfers of the 64 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 130 mm bore 23126EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 130 mm bearing, and drive-up procedures differ.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23126EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,900 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 64 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 710/906 kN ratings, 47.1 kN Pu and 8250 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23126EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23126EMKD1?",
        "a": "23126EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 130 mm bore, 210 mm OD and 64 mm width (5.118 × 8.268 × 2.52 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 710 kN, C0 906 kN, Pu 47.1 kN, grease limiting speed 1,900 r/min, oil 2,400 r/min, mass about 8250 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23126EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23126EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23126EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23126EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23126EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23126EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 710 kN C / 906 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23126EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23126EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23126emkd1",
      "＊23126emkd1",
      "23126EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24126EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24126EMD1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 210,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 803,
    "static_load_kN": 1080,
    "fatigue_load_limit_kN": 45,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2400,
    "weight_g": 10700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24126EMD1 belongs to the 24100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 24126EMD1 is assembled exactly in that order. The cylindrical bore fits a machined 130 mm shaft seat directly; the same envelope in 24126EMK30D1 (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Selection: the C0/C ratio of 1.34 (1080/803 kN) reflects the heavy static and shock proportioning of 24126EMD1; size the equivalent load at the required L10 with shock factor for the application. Never mount 24126EMD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 210 mm race.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 130 mm bore 24126EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 2,400 r/min needs drain and level design; flooding the 80 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 130 mm bearing, and drive-up procedures differ.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 80 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Do not confuse EA and EM at the same number: 24126EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 130×210 mm envelope is identical.",
      "The 803/1080 kN ratings, 45 kN Pu and 10700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24126EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24126EMD1?",
        "a": "24126EMD1 is an NTN double-row spherical roller bearing to ISO 15: 130 mm bore, 210 mm OD and 80 mm width (5.118 × 8.268 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 803 kN, C0 1080 kN, Pu 45 kN, grease limiting speed 1,800 r/min, oil 2,400 r/min, mass about 10700 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24126EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24126EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24126EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24126EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24126EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24126EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 803 kN C / 1080 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24126EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24126EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24126emd1",
      "＊24126emd1",
      "24126EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24126EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24126EMK30D1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 210,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 803,
    "static_load_kN": 1080,
    "fatigue_load_limit_kN": 45,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2400,
    "weight_g": 10500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24126EMK30D1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 130 mm shaft — 803 kN basic dynamic capacity in a 10500 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 130 mm bore; the 80 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The 40.0 mm radial section over the 130 mm bore carries two roller rows; capacity per millimetre of bore is about 6.2 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Pu 45 kN against C0 1080 kN anchors the contamination derating; for dirty mining duty the adjusted life of 24126EMK30D1 moves with cleanliness far more than with small C variations. Never mount 24126EMK30D1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 210 mm race.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 130 mm bore 24126EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 130 mm bearing, and drive-up procedures differ.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 24126EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 130 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 24126EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 803/1080 kN ratings, 45 kN Pu and 10500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24126EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24126EMK30D1?",
        "a": "24126EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 130 mm bore, 210 mm OD and 80 mm width (5.118 × 8.268 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 803 kN, C0 1080 kN, Pu 45 kN, grease limiting speed 1,800 r/min, oil 2,400 r/min, mass about 10500 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24126EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 130 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24126EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24126EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24126EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24126EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24126EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 803 kN C / 1080 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24126EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24126EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24126emk30d1",
      "＊24126emk30d1",
      "24126EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22226EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22226EAD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 230,
    "B_mm": 64,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 808,
    "static_load_kN": 898,
    "fatigue_load_limit_kN": 56.6,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2800,
    "weight_g": 11000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22226EAD1 identifies a 130×230×64 mm (5.118 × 9.055 × 2.52 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 130 mm bore; the 64 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The cylindrical bore fits a machined 130 mm shaft seat directly; the same envelope in 22226EAKD1 (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. With about 6.2 kN of C per millimetre of the 130 mm bore, 22226EAD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Fit the cylindrical-bore 22226EAD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 130 mm bore 22226EAD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22226EAD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 808 kN rating no longer applies.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22226EAD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Do not confuse EA and EM at the same number: 22226EAD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 130×230 mm envelope is identical.",
      "The 808/898 kN ratings, 56.6 kN Pu and 11000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22226EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22226EAD1?",
        "a": "22226EAD1 is an NTN double-row spherical roller bearing to ISO 15: 130 mm bore, 230 mm OD and 64 mm width (5.118 × 9.055 × 2.52 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 808 kN, C0 898 kN, Pu 56.6 kN, grease limiting speed 2,200 r/min, oil 2,800 r/min, mass about 11000 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22226EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22226EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22226EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22226EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22226EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22226EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 808 kN C / 898 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22226EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22226EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22226ead1",
      "＊22226ead1",
      "22226EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22226EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22226EAKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 230,
    "B_mm": 64,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 808,
    "static_load_kN": 898,
    "fatigue_load_limit_kN": 56.6,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2800,
    "weight_g": 10700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22226EAKD1 identifies a 130×230×64 mm (5.118 × 9.055 × 2.52 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 130 mm bore; the 64 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Suffix reading on 22226EAKD1: EA identifies the high-capacity execution with a pressed sheet-steel window cage; K marks the 1:12 tapered bore; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. With about 6.2 kN of C per millimetre of the 130 mm bore, 22226EAKD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22226EAKD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 130 mm bore 22226EAKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22226EAKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,200 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22226EAD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 64 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 808/898 kN ratings, 56.6 kN Pu and 10700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22226EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22226EAKD1?",
        "a": "22226EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 130 mm bore, 230 mm OD and 64 mm width (5.118 × 9.055 × 2.52 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 808 kN, C0 898 kN, Pu 56.6 kN, grease limiting speed 2,200 r/min, oil 2,800 r/min, mass about 10700 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22226EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22226EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22226EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22226EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22226EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22226EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 808 kN C / 898 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22226EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22226EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22226eakd1",
      "＊22226eakd1",
      "22226EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22226EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22226EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 230,
    "B_mm": 64,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 808,
    "static_load_kN": 898,
    "fatigue_load_limit_kN": 56.6,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2800,
    "weight_g": 11100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22226EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 130 mm shaft — 808 kN basic dynamic capacity in a 11100 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 130 mm bore; the 64 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Suffix reading on 22226EMD1: EM identifies the high-capacity execution with a one-piece machined brass cage; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. Pu 56.6 kN against C0 898 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22226EMD1 moves with cleanliness far more than with small C variations. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22226EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 130 mm bore 22226EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 808 kN rating no longer applies.",
      "Do not confuse EA and EM at the same number: 22226EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 130×230 mm envelope is identical.",
      "Oil relubrication toward 2,800 r/min needs drain and level design; flooding the 64 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 64 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 808/898 kN ratings, 56.6 kN Pu and 11100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22226EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22226EMD1?",
        "a": "22226EMD1 is an NTN double-row spherical roller bearing to ISO 15: 130 mm bore, 230 mm OD and 64 mm width (5.118 × 9.055 × 2.52 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 808 kN, C0 898 kN, Pu 56.6 kN, grease limiting speed 2,200 r/min, oil 2,800 r/min, mass about 11100 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22226EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22226EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22226EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22226EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22226EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22226EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 808 kN C / 898 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22226EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22226EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22226emd1",
      "＊22226emd1",
      "22226EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22226EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22226EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 230,
    "B_mm": 64,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 808,
    "static_load_kN": 898,
    "fatigue_load_limit_kN": 56.6,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2800,
    "weight_g": 10900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22226EMKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 130 mm bore, 230 mm OD, 64 mm width, rated 2,200 r/min on grease. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 22226EMKD1 is assembled exactly in that order. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. With about 6.2 kN of C per millimetre of the 130 mm bore, 22226EMKD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22226EMKD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 130 mm bore 22226EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 808 kN rating no longer applies.",
      "Oil relubrication toward 2,800 r/min needs drain and level design; flooding the 64 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 808 kN rating no longer applies.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 130 mm bearing, and drive-up procedures differ.",
      "The 808/898 kN ratings, 56.6 kN Pu and 10900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22226EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22226EMKD1?",
        "a": "22226EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 130 mm bore, 230 mm OD and 64 mm width (5.118 × 9.055 × 2.52 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 808 kN, C0 898 kN, Pu 56.6 kN, grease limiting speed 2,200 r/min, oil 2,800 r/min, mass about 10900 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22226EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22226EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22226EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22226EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22226EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22226EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 808 kN C / 898 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22226EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22226EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22226emkd1",
      "＊22226emkd1",
      "22226EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23226EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23226EMD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 230,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 958,
    "static_load_kN": 1130,
    "fatigue_load_limit_kN": 55.4,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2300,
    "weight_g": 13800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23226EMD1 identifies a 130×230×80 mm (5.118 × 9.055 × 3.15 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 23226EMD1 is assembled exactly in that order. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Pu 55.4 kN against C0 1130 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23226EMD1 moves with cleanliness far more than with small C variations. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 130 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 130 mm bore 23226EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 2,300 r/min needs drain and level design; flooding the 80 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23226EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 130 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23226EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 958/1130 kN ratings, 55.4 kN Pu and 13800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23226EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23226EMD1?",
        "a": "23226EMD1 is an NTN double-row spherical roller bearing to ISO 15: 130 mm bore, 230 mm OD and 80 mm width (5.118 × 9.055 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 958 kN, C0 1130 kN, Pu 55.4 kN, grease limiting speed 1,700 r/min, oil 2,300 r/min, mass about 13800 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23226EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23226EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23226EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23226EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23226EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23226EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 958 kN C / 1130 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23226EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23226EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23226emd1",
      "＊23226emd1",
      "23226EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23226EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23226EMKD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 230,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 958,
    "static_load_kN": 1130,
    "fatigue_load_limit_kN": 55.4,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2300,
    "weight_g": 13400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 130 mm shaft, NTN supplies 23226EMKD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 2,300 r/min. Digit by digit the code reads as spherical-roller dimension series plus 130 mm bore; the 80 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. With about 7.4 kN of C per millimetre of the 130 mm bore, 23226EMKD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 130 mm bore 23226EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23226EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Oil relubrication toward 2,300 r/min needs drain and level design; flooding the 80 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Never substitute 23226EMKD1 by envelope alone: the 1130 kN C0 and 55.4 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23226EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 958/1130 kN ratings, 55.4 kN Pu and 13400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23226EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23226EMKD1?",
        "a": "23226EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 130 mm bore, 230 mm OD and 80 mm width (5.118 × 9.055 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 958 kN, C0 1130 kN, Pu 55.4 kN, grease limiting speed 1,700 r/min, oil 2,300 r/min, mass about 13400 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23226EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23226EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23226EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23226EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23226EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23226EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 958 kN C / 1130 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23226EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23226EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23226emkd1",
      "＊23226emkd1",
      "23226EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22326EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22326EAD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 280,
    "B_mm": 93,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1330,
    "static_load_kN": 1400,
    "fatigue_load_limit_kN": 77.8,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 2000,
    "weight_g": 27200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22326EAD1 belongs to the 22300 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (cylindrical), lubrication feature (D1); 22326EAD1 is assembled exactly in that order. Two symmetric roller rows share the load: C 1330 kN, C0 1400 kN (C0/C ≈ 1.05), with useful axial capacity in either direction alongside the dominant radial load. Grease/oil ratio: the 1,600 r/min limiting value is .80 of the 2,000 r/min oil value; heavy 93 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Fit the cylindrical-bore 22326EAD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 130 mm bore 22326EAD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 130 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,600 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1330 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 130 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 1330/1400 kN ratings, 77.8 kN Pu and 27200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22326EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22326EAD1?",
        "a": "22326EAD1 is an NTN double-row spherical roller bearing to ISO 15: 130 mm bore, 280 mm OD and 93 mm width (5.118 × 11.024 × 3.661 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1330 kN, C0 1400 kN, Pu 77.8 kN, grease limiting speed 1,600 r/min, oil 2,000 r/min, mass about 27200 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22326EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22326EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22326EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22326EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22326EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22326EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1330 kN C / 1400 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22326EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22326EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22326ead1",
      "＊22326ead1",
      "22326EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22326EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22326EAKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 280,
    "B_mm": 93,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1330,
    "static_load_kN": 1400,
    "fatigue_load_limit_kN": 77.8,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 2000,
    "weight_g": 26600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22326EAKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 130×280×93 mm to ISO 15, with pressed sheet-steel window cage (EA high-capacity design). On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (K), lubrication feature (D1); 22326EAKD1 is assembled exactly in that order. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. With about 10.2 kN of C per millimetre of the 130 mm bore, 22326EAKD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 130 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 130 mm bore 22326EAKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22326EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 130 mm bearing, and drive-up procedures differ.",
      "Oil relubrication toward 2,000 r/min needs drain and level design; flooding the 93 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22326EAKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 1330/1400 kN ratings, 77.8 kN Pu and 26600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22326EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22326EAKD1?",
        "a": "22326EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 130 mm bore, 280 mm OD and 93 mm width (5.118 × 11.024 × 3.661 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1330 kN, C0 1400 kN, Pu 77.8 kN, grease limiting speed 1,600 r/min, oil 2,000 r/min, mass about 26600 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22326EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22326EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22326EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22326EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22326EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22326EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1330 kN C / 1400 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22326EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22326EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22326eakd1",
      "＊22326eakd1",
      "22326EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22326EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22326EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 280,
    "B_mm": 93,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1330,
    "static_load_kN": 1400,
    "fatigue_load_limit_kN": 77.8,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 2000,
    "weight_g": 28000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 130 mm shaft, NTN supplies 22326EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 2,000 r/min. Numbering ties 22326EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 130 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Open by design, 22326EMD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Grease/oil ratio: the 1,600 r/min limiting value is .80 of the 2,000 r/min oil value; heavy 93 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22326EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 130 mm bore 22326EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1330 kN rating no longer applies.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22326EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The cylindrical-bore 22326EMD1 and its tapered-bore counterpart 22326EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1330 kN rating no longer applies.",
      "The 1330/1400 kN ratings, 77.8 kN Pu and 28000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22326EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22326EMD1?",
        "a": "22326EMD1 is an NTN double-row spherical roller bearing to ISO 15: 130 mm bore, 280 mm OD and 93 mm width (5.118 × 11.024 × 3.661 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1330 kN, C0 1400 kN, Pu 77.8 kN, grease limiting speed 1,600 r/min, oil 2,000 r/min, mass about 28000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22326EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22326EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22326EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22326EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22326EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22326EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1330 kN C / 1400 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22326EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22326EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22326emd1",
      "＊22326emd1",
      "22326EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22326EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22326EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 280,
    "B_mm": 93,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1330,
    "static_load_kN": 1400,
    "fatigue_load_limit_kN": 77.8,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 2000,
    "weight_g": 27500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 130 mm shaft, NTN supplies 22326EMKD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 2,000 r/min. The leading digits are the ISO 15 dimension series (22300 series); the bore code resolves to 130 mm (two-digit code ×5, with the 00–03 exception table), and 280 mm OD / 93 mm width follow the general plan. Two symmetric roller rows share the load: C 1330 kN, C0 1400 kN (C0/C ≈ 1.05), with useful axial capacity in either direction alongside the dominant radial load. Catalogue mass 27500 g (27.50 kg) for the 130×280×93 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 130 mm bore 22326EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 2,000 r/min needs drain and level design; flooding the 93 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,600 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1330 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 130 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 1330/1400 kN ratings, 77.8 kN Pu and 27500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22326EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22326EMKD1?",
        "a": "22326EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 130 mm bore, 280 mm OD and 93 mm width (5.118 × 11.024 × 3.661 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1330 kN, C0 1400 kN, Pu 77.8 kN, grease limiting speed 1,600 r/min, oil 2,000 r/min, mass about 27500 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22326EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22326EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22326EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22326EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22326EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22326EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1330 kN C / 1400 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22326EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22326EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22326emkd1",
      "＊22326emkd1",
      "22326EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23028EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23028EAD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 210,
    "B_mm": 53,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 597,
    "static_load_kN": 783,
    "fatigue_load_limit_kN": 47.5,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2700,
    "weight_g": 6320,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23028EAD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 140×210×53 mm to ISO 15, with pressed sheet-steel window cage (EA high-capacity design). The leading digits are the ISO 15 dimension series (23000 series); the bore code resolves to 140 mm (two-digit code ×5, with the 00–03 exception table), and 210 mm OD / 53 mm width follow the general plan. The 35.0 mm radial section over the 140 mm bore carries two roller rows; capacity per millimetre of bore is about 4.3 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. 140 mm bore is 5.512 in and 210 mm OD is 8.268 in; the ISO 15 envelope swaps between brands, but the 597/783 kN ratings and cage design are NTN 2203E values. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 23028EAD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 140 mm bore 23028EAD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 140 mm bearing, and drive-up procedures differ.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 140 mm bearing, and drive-up procedures differ.",
      "Never substitute 23028EAD1 by envelope alone: the 783 kN C0 and 47.5 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "The cylindrical-bore 23028EAD1 and its tapered-bore counterpart 23028EAKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 597/783 kN ratings, 47.5 kN Pu and 6320 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23028EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23028EAD1?",
        "a": "23028EAD1 is an NTN double-row spherical roller bearing to ISO 15: 140 mm bore, 210 mm OD and 53 mm width (5.512 × 8.268 × 2.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 597 kN, C0 783 kN, Pu 47.5 kN, grease limiting speed 2,100 r/min, oil 2,700 r/min, mass about 6320 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23028EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23028EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23028EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23028EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23028EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23028EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 597 kN C / 783 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23028EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23028EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23028ead1",
      "＊23028ead1",
      "23028EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23028EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23028EAKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 210,
    "B_mm": 53,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 597,
    "static_load_kN": 783,
    "fatigue_load_limit_kN": 47.5,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2700,
    "weight_g": 6130,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23028EAKD1 denotes the 140 mm bore spherical roller bearing (597 kN C / 783 kN C0) in the 23000 series, the self-aligning choice for heavy combined load. Digit by digit the code reads as spherical-roller dimension series plus 140 mm bore; the 53 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Grease/oil ratio: the 2,100 r/min limiting value is .78 of the 2,700 r/min oil value; heavy 53 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 140 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 140 mm bore 23028EAKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 53 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Do not confuse EA and EM at the same number: 23028EAKD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 140×210 mm envelope is identical.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23028EAD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 140 mm bearing, and drive-up procedures differ.",
      "The 597/783 kN ratings, 47.5 kN Pu and 6130 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23028EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23028EAKD1?",
        "a": "23028EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 140 mm bore, 210 mm OD and 53 mm width (5.512 × 8.268 × 2.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 597 kN, C0 783 kN, Pu 47.5 kN, grease limiting speed 2,100 r/min, oil 2,700 r/min, mass about 6130 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23028EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23028EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23028EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23028EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23028EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23028EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 597 kN C / 783 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23028EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23028EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23028eakd1",
      "＊23028eakd1",
      "23028EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23028EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23028EMD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 210,
    "B_mm": 53,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 597,
    "static_load_kN": 783,
    "fatigue_load_limit_kN": 47.5,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2700,
    "weight_g": 6370,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23028EMD1 identifies a 140×210×53 mm (5.512 × 8.268 × 2.087 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 140 mm bore; the 53 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. At 597 kN C and 6370 g mass the 23000 series part is built for shock and vibration; the 53 mm-wide ring needs square abutments to keep both rows equally loaded. 140 mm bore is 5.512 in and 210 mm OD is 8.268 in; the ISO 15 envelope swaps between brands, but the 597/783 kN ratings and cage design are NTN 2203E values. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 140 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 140 mm bore 23028EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23028EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Oil relubrication toward 2,700 r/min needs drain and level design; flooding the 53 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Do not confuse EA and EM at the same number: 23028EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 140×210 mm envelope is identical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,100 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 597/783 kN ratings, 47.5 kN Pu and 6370 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23028EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23028EMD1?",
        "a": "23028EMD1 is an NTN double-row spherical roller bearing to ISO 15: 140 mm bore, 210 mm OD and 53 mm width (5.512 × 8.268 × 2.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 597 kN, C0 783 kN, Pu 47.5 kN, grease limiting speed 2,100 r/min, oil 2,700 r/min, mass about 6370 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23028EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23028EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23028EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23028EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23028EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23028EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 597 kN C / 783 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23028EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23028EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23028emd1",
      "＊23028emd1",
      "23028EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23028EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23028EMKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 210,
    "B_mm": 53,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 597,
    "static_load_kN": 783,
    "fatigue_load_limit_kN": 47.5,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2700,
    "weight_g": 6180,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23028EMKD1 identifies a 140×210×53 mm (5.512 × 8.268 × 2.087 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 23028EMKD1 is assembled exactly in that order. Pu 47.5 kN is the catalogue fatigue load limit for 23028EMKD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. 140 mm bore is 5.512 in and 210 mm OD is 8.268 in; the ISO 15 envelope swaps between brands, but the 597/783 kN ratings and cage design are NTN 2203E values. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 140 mm bore 23028EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23028EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Never substitute 23028EMKD1 by envelope alone: the 783 kN C0 and 47.5 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Never substitute 23028EMKD1 by envelope alone: the 783 kN C0 and 47.5 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23028EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 597/783 kN ratings, 47.5 kN Pu and 6180 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23028EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23028EMKD1?",
        "a": "23028EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 140 mm bore, 210 mm OD and 53 mm width (5.512 × 8.268 × 2.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 597 kN, C0 783 kN, Pu 47.5 kN, grease limiting speed 2,100 r/min, oil 2,700 r/min, mass about 6180 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23028EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23028EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23028EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23028EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23028EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23028EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 597 kN C / 783 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23028EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23028EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23028emkd1",
      "＊23028emkd1",
      "23028EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24028EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24028EMD1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 210,
    "B_mm": 69,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 709,
    "static_load_kN": 990,
    "fatigue_load_limit_kN": 46,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2200,
    "weight_g": 8270,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24028EMD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 140×210×69 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 24028EMD1 is assembled exactly in that order. Suffix reading on 24028EMD1: EM identifies the high-capacity execution with a one-piece machined brass cage; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. 140 mm bore is 5.512 in and 210 mm OD is 8.268 in; the ISO 15 envelope swaps between brands, but the 709/990 kN ratings and cage design are NTN 2203E values. Never mount 24028EMD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 210 mm race.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 140 mm bore 24028EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24028EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,800 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The cylindrical-bore 24028EMD1 and its tapered-bore counterpart 24028EMK30D1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 69 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 709/990 kN ratings, 46 kN Pu and 8270 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24028EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24028EMD1?",
        "a": "24028EMD1 is an NTN double-row spherical roller bearing to ISO 15: 140 mm bore, 210 mm OD and 69 mm width (5.512 × 8.268 × 2.717 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 709 kN, C0 990 kN, Pu 46 kN, grease limiting speed 1,800 r/min, oil 2,200 r/min, mass about 8270 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24028EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24028EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24028EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24028EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24028EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24028EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 709 kN C / 990 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24028EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24028EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24028emd1",
      "＊24028emd1",
      "24028EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24028EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24028EMK30D1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 210,
    "B_mm": 69,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 709,
    "static_load_kN": 990,
    "fatigue_load_limit_kN": 46,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2200,
    "weight_g": 8150,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 24028EMK30D1 denotes the 140 mm bore spherical roller bearing (709 kN C / 990 kN C0) in the 24000 series, the self-aligning choice for heavy combined load. Reading the full code: the number gives the 140×210 mm envelope, EM names the cage/capacity execution, K30 marks the 1:30 tapered bore for sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. Open by design, 24028EMK30D1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Pu 46 kN against C0 990 kN anchors the contamination derating; for dirty mining duty the adjusted life of 24028EMK30D1 moves with cleanliness far more than with small C variations. Fillet radii on shaft and housing must clear the ring chamfers of the 69 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 140 mm bore 24028EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24028EMK30D1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 140 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Oil relubrication toward 2,200 r/min needs drain and level design; flooding the 69 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 709 kN rating no longer applies.",
      "The 709/990 kN ratings, 46 kN Pu and 8150 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24028EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24028EMK30D1?",
        "a": "24028EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 140 mm bore, 210 mm OD and 69 mm width (5.512 × 8.268 × 2.717 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 709 kN, C0 990 kN, Pu 46 kN, grease limiting speed 1,800 r/min, oil 2,200 r/min, mass about 8150 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 24028EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 140 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24028EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24028EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24028EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24028EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24028EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 709 kN C / 990 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24028EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24028EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24028emk30d1",
      "＊24028emk30d1",
      "24028EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23128EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23128EAD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 225,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 802,
    "static_load_kN": 1030,
    "fatigue_load_limit_kN": 53.1,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2200,
    "weight_g": 10300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23128EAD1 belongs to the 23100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (cylindrical), lubrication feature (D1); 23128EAD1 is assembled exactly in that order. Open by design, 23128EAD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Selection: the C0/C ratio of 1.28 (1030/802 kN) reflects the heavy static and shock proportioning of 23128EAD1; size the equivalent load at the required L10 with shock factor for the application. Never mount 23128EAD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 225 mm race.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 140 mm bore 23128EAD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 140 mm bearing, and drive-up procedures differ.",
      "The cylindrical-bore 23128EAD1 and its tapered-bore counterpart 23128EAKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,800 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 802 kN rating no longer applies.",
      "The 802/1030 kN ratings, 53.1 kN Pu and 10300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23128EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23128EAD1?",
        "a": "23128EAD1 is an NTN double-row spherical roller bearing to ISO 15: 140 mm bore, 225 mm OD and 68 mm width (5.512 × 8.858 × 2.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 802 kN, C0 1030 kN, Pu 53.1 kN, grease limiting speed 1,800 r/min, oil 2,200 r/min, mass about 10300 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23128EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23128EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23128EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23128EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23128EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23128EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 802 kN C / 1030 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23128EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23128EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23128ead1",
      "＊23128ead1",
      "23128EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23128EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23128EAKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 225,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 802,
    "static_load_kN": 1030,
    "fatigue_load_limit_kN": 53.1,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2200,
    "weight_g": 9940,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23128EAKD1 is the EA pressed-steel-cage execution of NTN's spherical roller range for a 140 mm shaft — 802 kN basic dynamic capacity in a 9940 g, open ISO 15 envelope. Reading the full code: the number gives the 140×225 mm envelope, EA names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. Two symmetric roller rows share the load: C 802 kN, C0 1030 kN (C0/C ≈ 1.28), with useful axial capacity in either direction alongside the dominant radial load. Catalogue mass 9940 g (9.94 kg) for the 140×225×68 mm execution includes the EA pressed-steel-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Mount 23128EAKD1 on its adapter or withdrawal sleeve on the 140 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 140 mm bore 23128EAKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23128EAKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23128EAKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23128EAD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 140 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 802/1030 kN ratings, 53.1 kN Pu and 9940 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23128EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23128EAKD1?",
        "a": "23128EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 140 mm bore, 225 mm OD and 68 mm width (5.512 × 8.858 × 2.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 802 kN, C0 1030 kN, Pu 53.1 kN, grease limiting speed 1,800 r/min, oil 2,200 r/min, mass about 9940 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23128EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23128EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23128EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23128EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23128EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23128EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 802 kN C / 1030 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23128EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23128EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23128eakd1",
      "＊23128eakd1",
      "23128EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23128EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23128EMD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 225,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 802,
    "static_load_kN": 1030,
    "fatigue_load_limit_kN": 53.1,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2200,
    "weight_g": 10300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23128EMD1 belongs to the 23100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 23128EMD1 is assembled exactly in that order. Pu 53.1 kN is the catalogue fatigue load limit for 23128EMD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Equivalent-load planning keeps a radial plus moderate axial combination on 23128EMD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 140 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 140 mm bore 23128EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23128EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Do not confuse EA and EM at the same number: 23128EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 140×225 mm envelope is identical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 140 mm bearing, and drive-up procedures differ.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23128EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 802/1030 kN ratings, 53.1 kN Pu and 10300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23128EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23128EMD1?",
        "a": "23128EMD1 is an NTN double-row spherical roller bearing to ISO 15: 140 mm bore, 225 mm OD and 68 mm width (5.512 × 8.858 × 2.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 802 kN, C0 1030 kN, Pu 53.1 kN, grease limiting speed 1,800 r/min, oil 2,200 r/min, mass about 10300 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23128EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23128EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23128EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23128EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23128EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23128EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 802 kN C / 1030 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23128EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23128EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23128emd1",
      "＊23128emd1",
      "23128EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23128EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23128EMKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 225,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 802,
    "static_load_kN": 1030,
    "fatigue_load_limit_kN": 53.1,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2200,
    "weight_g": 10000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23128EMKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 140×225×68 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). The leading digits are the ISO 15 dimension series (23100 series); the bore code resolves to 140 mm (two-digit code ×5, with the 00–03 exception table), and 225 mm OD / 68 mm width follow the general plan. Open by design, 23128EMKD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. 140 mm bore is 5.512 in and 225 mm OD is 8.858 in; the ISO 15 envelope swaps between brands, but the 802/1030 kN ratings and cage design are NTN 2203E values. Mount 23128EMKD1 on its adapter or withdrawal sleeve on the 140 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 140 mm bore 23128EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 140 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Do not confuse EA and EM at the same number: 23128EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 140×225 mm envelope is identical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 802 kN rating no longer applies.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 802 kN rating no longer applies.",
      "The 802/1030 kN ratings, 53.1 kN Pu and 10000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23128EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23128EMKD1?",
        "a": "23128EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 140 mm bore, 225 mm OD and 68 mm width (5.512 × 8.858 × 2.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 802 kN, C0 1030 kN, Pu 53.1 kN, grease limiting speed 1,800 r/min, oil 2,200 r/min, mass about 10000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23128EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23128EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23128EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23128EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23128EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23128EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 802 kN C / 1030 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23128EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23128EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23128emkd1",
      "＊23128emkd1",
      "23128EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24128EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24128EMD1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 225,
    "B_mm": 85,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 951,
    "static_load_kN": 1280,
    "fatigue_load_limit_kN": 53.3,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2200,
    "weight_g": 12900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24128EMD1 belongs to the 24100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 140 mm (two-digit code ×5, with the 00–03 exception table), and 225 mm OD / 85 mm width follow the general plan. The 42.5 mm radial section over the 140 mm bore carries two roller rows; capacity per millimetre of bore is about 6.8 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Equivalent-load planning keeps a radial plus moderate axial combination on 24128EMD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Fillet radii on shaft and housing must clear the ring chamfers of the 85 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 140 mm bore 24128EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 140 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 951 kN rating no longer applies.",
      "Do not confuse EA and EM at the same number: 24128EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 140×225 mm envelope is identical.",
      "The cylindrical-bore 24128EMD1 and its tapered-bore counterpart 24128EMK30D1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 951/1280 kN ratings, 53.3 kN Pu and 12900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24128EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24128EMD1?",
        "a": "24128EMD1 is an NTN double-row spherical roller bearing to ISO 15: 140 mm bore, 225 mm OD and 85 mm width (5.512 × 8.858 × 3.346 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 951 kN, C0 1280 kN, Pu 53.3 kN, grease limiting speed 1,700 r/min, oil 2,200 r/min, mass about 12900 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24128EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24128EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24128EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24128EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24128EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24128EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 951 kN C / 1280 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24128EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24128EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24128emd1",
      "＊24128emd1",
      "24128EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24128EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24128EMK30D1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 225,
    "B_mm": 85,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 951,
    "static_load_kN": 1280,
    "fatigue_load_limit_kN": 53.3,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2200,
    "weight_g": 12800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24128EMK30D1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 140×225×85 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). Numbering ties 24128EMK30D1 to its envelope and execution: same-number EA versus EM or plain variants share the 140 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. The 42.5 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 85 mm-wide ring seats fully on both sides. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 140 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 140 mm bore 24128EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 140 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24128EMK30D1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24128EMK30D1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24128EMK30D1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 951/1280 kN ratings, 53.3 kN Pu and 12800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24128EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24128EMK30D1?",
        "a": "24128EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 140 mm bore, 225 mm OD and 85 mm width (5.512 × 8.858 × 3.346 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 951 kN, C0 1280 kN, Pu 53.3 kN, grease limiting speed 1,700 r/min, oil 2,200 r/min, mass about 12800 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24128EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 140 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24128EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24128EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24128EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24128EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24128EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 951 kN C / 1280 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24128EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24128EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24128emk30d1",
      "＊24128emk30d1",
      "24128EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22228EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22228EAD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 250,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 912,
    "static_load_kN": 1010,
    "fatigue_load_limit_kN": 65.8,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2500,
    "weight_g": 13900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22228EAD1 identifies a 140×250×68 mm (5.512 × 9.843 × 2.677 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (cylindrical), lubrication feature (D1); 22228EAD1 is assembled exactly in that order. The 55.0 mm radial section over the 140 mm bore carries two roller rows; capacity per millimetre of bore is about 6.5 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Pu 65.8 kN against C0 1010 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22228EAD1 moves with cleanliness far more than with small C variations. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 140 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 140 mm bore 22228EAD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 140 mm bearing, and drive-up procedures differ.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,000 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22228EAD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The cylindrical-bore 22228EAD1 and its tapered-bore counterpart 22228EAKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 912/1010 kN ratings, 65.8 kN Pu and 13900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22228EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22228EAD1?",
        "a": "22228EAD1 is an NTN double-row spherical roller bearing to ISO 15: 140 mm bore, 250 mm OD and 68 mm width (5.512 × 9.843 × 2.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 912 kN, C0 1010 kN, Pu 65.8 kN, grease limiting speed 2,000 r/min, oil 2,500 r/min, mass about 13900 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22228EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22228EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22228EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22228EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22228EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22228EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 912 kN C / 1010 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22228EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22228EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22228ead1",
      "＊22228ead1",
      "22228EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22228EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22228EAKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 250,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 912,
    "static_load_kN": 1010,
    "fatigue_load_limit_kN": 65.8,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2500,
    "weight_g": 13600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22228EAKD1 is the EA pressed-steel-cage execution of NTN's spherical roller range for a 140 mm shaft — 912 kN basic dynamic capacity in a 13600 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 140 mm bore; the 68 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Open by design, 22228EAKD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Catalogue mass 13600 g (13.60 kg) for the 140×250×68 mm execution includes the EA pressed-steel-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Never mount 22228EAKD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 250 mm race.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 140 mm bore 22228EAKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 912 kN rating no longer applies.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 912 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 140 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 912 kN rating no longer applies.",
      "The 912/1010 kN ratings, 65.8 kN Pu and 13600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22228EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22228EAKD1?",
        "a": "22228EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 140 mm bore, 250 mm OD and 68 mm width (5.512 × 9.843 × 2.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 912 kN, C0 1010 kN, Pu 65.8 kN, grease limiting speed 2,000 r/min, oil 2,500 r/min, mass about 13600 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22228EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22228EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22228EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22228EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22228EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22228EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 912 kN C / 1010 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22228EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22228EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22228eakd1",
      "＊22228eakd1",
      "22228EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22228EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22228EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 250,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 912,
    "static_load_kN": 1010,
    "fatigue_load_limit_kN": 65.8,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2500,
    "weight_g": 14200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22228EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 140 mm shaft — 912 kN basic dynamic capacity in a 14200 g, open ISO 15 envelope. Numbering ties 22228EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 140 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. At 912 kN C and 14200 g mass the 22200 series part is built for shock and vibration; the 68 mm-wide ring needs square abutments to keep both rows equally loaded. Pu 65.8 kN against C0 1010 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22228EMD1 moves with cleanliness far more than with small C variations. Never mount 22228EMD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 250 mm race.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 140 mm bore 22228EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22228EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22228EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 912 kN rating no longer applies.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,000 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 912/1010 kN ratings, 65.8 kN Pu and 14200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22228EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22228EMD1?",
        "a": "22228EMD1 is an NTN double-row spherical roller bearing to ISO 15: 140 mm bore, 250 mm OD and 68 mm width (5.512 × 9.843 × 2.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 912 kN, C0 1010 kN, Pu 65.8 kN, grease limiting speed 2,000 r/min, oil 2,500 r/min, mass about 14200 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22228EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22228EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22228EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22228EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22228EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22228EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 912 kN C / 1010 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22228EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22228EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22228emd1",
      "＊22228emd1",
      "22228EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22228EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22228EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 250,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 912,
    "static_load_kN": 1010,
    "fatigue_load_limit_kN": 65.8,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2500,
    "weight_g": 13900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22228EMKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 140×250×68 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 22228EMKD1 is assembled exactly in that order. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. Pu 65.8 kN against C0 1010 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22228EMKD1 moves with cleanliness far more than with small C variations. Mount 22228EMKD1 on its adapter or withdrawal sleeve on the 140 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 140 mm bore 22228EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22228EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22228EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22228EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Never substitute 22228EMKD1 by envelope alone: the 1010 kN C0 and 65.8 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 912/1010 kN ratings, 65.8 kN Pu and 13900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22228EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22228EMKD1?",
        "a": "22228EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 140 mm bore, 250 mm OD and 68 mm width (5.512 × 9.843 × 2.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 912 kN, C0 1010 kN, Pu 65.8 kN, grease limiting speed 2,000 r/min, oil 2,500 r/min, mass about 13900 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22228EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22228EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22228EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22228EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22228EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22228EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 912 kN C / 1010 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22228EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22228EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22228emkd1",
      "＊22228emkd1",
      "22228EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23228EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23228EMD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 250,
    "B_mm": 88,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1140,
    "static_load_kN": 1370,
    "fatigue_load_limit_kN": 64.2,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 2100,
    "weight_g": 18200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23228EMD1 identifies a 140×250×88 mm (5.512 × 9.843 × 3.465 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. The leading digits are the ISO 15 dimension series (23200 series); the bore code resolves to 140 mm (two-digit code ×5, with the 00–03 exception table), and 250 mm OD / 88 mm width follow the general plan. Suffix reading on 23228EMD1: EM identifies the high-capacity execution with a one-piece machined brass cage; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. Selection: the C0/C ratio of 1.20 (1370/1140 kN) reflects the heavy static and shock proportioning of 23228EMD1; size the equivalent load at the required L10 with shock factor for the application. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 140 mm set.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 140 mm bore 23228EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 140 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Oil relubrication toward 2,100 r/min needs drain and level design; flooding the 88 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23228EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 88 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 1140/1370 kN ratings, 64.2 kN Pu and 18200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23228EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23228EMD1?",
        "a": "23228EMD1 is an NTN double-row spherical roller bearing to ISO 15: 140 mm bore, 250 mm OD and 88 mm width (5.512 × 9.843 × 3.465 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1140 kN, C0 1370 kN, Pu 64.2 kN, grease limiting speed 1,600 r/min, oil 2,100 r/min, mass about 18200 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23228EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23228EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23228EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23228EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23228EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23228EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1140 kN C / 1370 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23228EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23228EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23228emd1",
      "＊23228emd1",
      "23228EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23228EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23228EMKD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 250,
    "B_mm": 88,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1140,
    "static_load_kN": 1370,
    "fatigue_load_limit_kN": 64.2,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 2100,
    "weight_g": 17700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23228EMKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 140 mm bore, 250 mm OD, 88 mm width, rated 1,600 r/min on grease. Digit by digit the code reads as spherical-roller dimension series plus 140 mm bore; the 88 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The 55.0 mm radial section over the 140 mm bore carries two roller rows; capacity per millimetre of bore is about 8.1 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Pu 64.2 kN against C0 1370 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23228EMKD1 moves with cleanliness far more than with small C variations. Fillet radii on shaft and housing must clear the ring chamfers of the 88 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 140 mm bore 23228EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 2,100 r/min needs drain and level design; flooding the 88 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23228EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1140 kN rating no longer applies.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23228EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 1140/1370 kN ratings, 64.2 kN Pu and 17700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23228EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23228EMKD1?",
        "a": "23228EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 140 mm bore, 250 mm OD and 88 mm width (5.512 × 9.843 × 3.465 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1140 kN, C0 1370 kN, Pu 64.2 kN, grease limiting speed 1,600 r/min, oil 2,100 r/min, mass about 17700 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23228EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23228EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23228EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23228EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23228EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23228EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1140 kN C / 1370 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23228EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23228EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23228emkd1",
      "＊23228emkd1",
      "23228EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22328EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22328EAD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 300,
    "B_mm": 102,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1540,
    "static_load_kN": 1720,
    "fatigue_load_limit_kN": 88.8,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1900,
    "weight_g": 34400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22328EAD1 belongs to the 22300 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (22300 series); the bore code resolves to 140 mm (two-digit code ×5, with the 00–03 exception table), and 300 mm OD / 102 mm width follow the general plan. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. With about 11.0 kN of C per millimetre of the 140 mm bore, 22328EAD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 140 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 140 mm bore 22328EAD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22328EAD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22328EAD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 140 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22328EAD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 1540/1720 kN ratings, 88.8 kN Pu and 34400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22328EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22328EAD1?",
        "a": "22328EAD1 is an NTN double-row spherical roller bearing to ISO 15: 140 mm bore, 300 mm OD and 102 mm width (5.512 × 11.811 × 4.016 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1540 kN, C0 1720 kN, Pu 88.8 kN, grease limiting speed 1,500 r/min, oil 1,900 r/min, mass about 34400 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22328EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22328EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22328EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22328EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22328EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22328EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1540 kN C / 1720 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22328EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22328EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22328ead1",
      "＊22328ead1",
      "22328EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22328EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22328EAKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 300,
    "B_mm": 102,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1540,
    "static_load_kN": 1720,
    "fatigue_load_limit_kN": 88.8,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1900,
    "weight_g": 33700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22328EAKD1 identifies a 140×300×102 mm (5.512 × 11.811 × 4.016 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (K), lubrication feature (D1); 22328EAKD1 is assembled exactly in that order. The 80.0 mm radial section over the 140 mm bore carries two roller rows; capacity per millimetre of bore is about 11.0 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Pu 88.8 kN against C0 1720 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22328EAKD1 moves with cleanliness far more than with small C variations. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22328EAKD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 140 mm bore 22328EAKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 1,900 r/min needs drain and level design; flooding the 102 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22328EAD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 140 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22328EAD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 1540/1720 kN ratings, 88.8 kN Pu and 33700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22328EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22328EAKD1?",
        "a": "22328EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 140 mm bore, 300 mm OD and 102 mm width (5.512 × 11.811 × 4.016 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1540 kN, C0 1720 kN, Pu 88.8 kN, grease limiting speed 1,500 r/min, oil 1,900 r/min, mass about 33700 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22328EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22328EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22328EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22328EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22328EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22328EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1540 kN C / 1720 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22328EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22328EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22328eakd1",
      "＊22328eakd1",
      "22328EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22328EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22328EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 300,
    "B_mm": 102,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1540,
    "static_load_kN": 1720,
    "fatigue_load_limit_kN": 88.8,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1900,
    "weight_g": 35400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 140 mm shaft, NTN supplies 22328EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,900 r/min. Digit by digit the code reads as spherical-roller dimension series plus 140 mm bore; the 102 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Pu 88.8 kN is the catalogue fatigue load limit for 22328EMD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. With about 11.0 kN of C per millimetre of the 140 mm bore, 22328EMD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Never mount 22328EMD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 300 mm race.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 140 mm bore 22328EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22328EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Never substitute 22328EMD1 by envelope alone: the 1720 kN C0 and 88.8 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Never substitute 22328EMD1 by envelope alone: the 1720 kN C0 and 88.8 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22328EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 1540/1720 kN ratings, 88.8 kN Pu and 35400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22328EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22328EMD1?",
        "a": "22328EMD1 is an NTN double-row spherical roller bearing to ISO 15: 140 mm bore, 300 mm OD and 102 mm width (5.512 × 11.811 × 4.016 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1540 kN, C0 1720 kN, Pu 88.8 kN, grease limiting speed 1,500 r/min, oil 1,900 r/min, mass about 35400 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22328EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22328EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22328EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22328EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22328EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22328EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1540 kN C / 1720 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22328EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22328EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22328emd1",
      "＊22328emd1",
      "22328EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22328EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22328EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 300,
    "B_mm": 102,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1540,
    "static_load_kN": 1720,
    "fatigue_load_limit_kN": 88.8,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1900,
    "weight_g": 34700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22328EMKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 140 mm bore, 300 mm OD, 102 mm width, rated 1,500 r/min on grease. The leading digits are the ISO 15 dimension series (22300 series); the bore code resolves to 140 mm (two-digit code ×5, with the 00–03 exception table), and 300 mm OD / 102 mm width follow the general plan. At 1540 kN C and 34700 g mass the 22300 series part is built for shock and vibration; the 102 mm-wide ring needs square abutments to keep both rows equally loaded. Pu 88.8 kN against C0 1720 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22328EMKD1 moves with cleanliness far more than with small C variations. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22328EMKD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 140 mm bore 22328EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,500 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1540 kN rating no longer applies.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 140 mm bearing, and drive-up procedures differ.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,500 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1540/1720 kN ratings, 88.8 kN Pu and 34700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22328EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22328EMKD1?",
        "a": "22328EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 140 mm bore, 300 mm OD and 102 mm width (5.512 × 11.811 × 4.016 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1540 kN, C0 1720 kN, Pu 88.8 kN, grease limiting speed 1,500 r/min, oil 1,900 r/min, mass about 34700 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22328EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22328EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22328EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22328EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22328EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22328EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1540 kN C / 1720 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22328EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22328EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22328emkd1",
      "＊22328emkd1",
      "22328EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23030EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23030EAD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 225,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 660,
    "static_load_kN": 893,
    "fatigue_load_limit_kN": 52.9,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2500,
    "weight_g": 7680,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23030EAD1 identifies a 150×225×56 mm (5.906 × 8.858 × 2.205 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Numbering ties 23030EAD1 to its envelope and execution: same-number EA versus EM or plain variants share the 150 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Pu 52.9 kN is the catalogue fatigue load limit for 23030EAD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Catalogue mass 7680 g (7.68 kg) for the 150×225×56 mm execution includes the EA pressed-steel-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Fit the cylindrical-bore 23030EAD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 150 mm bore 23030EAD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 56 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 150 mm bearing, and drive-up procedures differ.",
      "The cylindrical-bore 23030EAD1 and its tapered-bore counterpart 23030EAKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23030EAD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 660/893 kN ratings, 52.9 kN Pu and 7680 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23030EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23030EAD1?",
        "a": "23030EAD1 is an NTN double-row spherical roller bearing to ISO 15: 150 mm bore, 225 mm OD and 56 mm width (5.906 × 8.858 × 2.205 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 660 kN, C0 893 kN, Pu 52.9 kN, grease limiting speed 2,000 r/min, oil 2,500 r/min, mass about 7680 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23030EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23030EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23030EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23030EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23030EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23030EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 660 kN C / 893 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23030EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23030EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23030ead1",
      "＊23030ead1",
      "23030EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23030EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23030EAKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 225,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 660,
    "static_load_kN": 893,
    "fatigue_load_limit_kN": 52.9,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2500,
    "weight_g": 7450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23030EAKD1 denotes the 150 mm bore spherical roller bearing (660 kN C / 893 kN C0) in the 23000 series, the self-aligning choice for heavy combined load. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (K), lubrication feature (D1); 23030EAKD1 is assembled exactly in that order. The 1:12 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 150 mm bore assembly. With about 4.4 kN of C per millimetre of the 150 mm bore, 23030EAKD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 150 mm bore 23030EAKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 56 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 56 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23030EAKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Do not confuse EA and EM at the same number: 23030EAKD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 150×225 mm envelope is identical.",
      "The 660/893 kN ratings, 52.9 kN Pu and 7450 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23030EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23030EAKD1?",
        "a": "23030EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 150 mm bore, 225 mm OD and 56 mm width (5.906 × 8.858 × 2.205 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 660 kN, C0 893 kN, Pu 52.9 kN, grease limiting speed 2,000 r/min, oil 2,500 r/min, mass about 7450 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23030EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23030EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23030EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23030EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23030EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23030EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 660 kN C / 893 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23030EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23030EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23030eakd1",
      "＊23030eakd1",
      "23030EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23030EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23030EMD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 225,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 660,
    "static_load_kN": 893,
    "fatigue_load_limit_kN": 52.9,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2500,
    "weight_g": 7730,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23030EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 150 mm shaft — 660 kN basic dynamic capacity in a 7730 g, open ISO 15 envelope. The leading digits are the ISO 15 dimension series (23000 series); the bore code resolves to 150 mm (two-digit code ×5, with the 00–03 exception table), and 225 mm OD / 56 mm width follow the general plan. Two symmetric roller rows share the load: C 660 kN, C0 893 kN (C0/C ≈ 1.35), with useful axial capacity in either direction alongside the dominant radial load. Catalogue mass 7730 g (7.73 kg) for the 150×225×56 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 23030EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 150 mm bore 23030EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 150 mm bearing, and drive-up procedures differ.",
      "Oil relubrication toward 2,500 r/min needs drain and level design; flooding the 56 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 56 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 150 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 660/893 kN ratings, 52.9 kN Pu and 7730 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23030EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23030EMD1?",
        "a": "23030EMD1 is an NTN double-row spherical roller bearing to ISO 15: 150 mm bore, 225 mm OD and 56 mm width (5.906 × 8.858 × 2.205 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 660 kN, C0 893 kN, Pu 52.9 kN, grease limiting speed 2,000 r/min, oil 2,500 r/min, mass about 7730 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23030EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23030EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23030EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23030EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23030EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23030EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 660 kN C / 893 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23030EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23030EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23030emd1",
      "＊23030emd1",
      "23030EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23030EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23030EMKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 225,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 660,
    "static_load_kN": 893,
    "fatigue_load_limit_kN": 52.9,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2500,
    "weight_g": 7500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23030EMKD1 identifies a 150×225×56 mm (5.906 × 8.858 × 2.205 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. The leading digits are the ISO 15 dimension series (23000 series); the bore code resolves to 150 mm (two-digit code ×5, with the 00–03 exception table), and 225 mm OD / 56 mm width follow the general plan. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Catalogue mass 7500 g (7.50 kg) for the 150×225×56 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Never mount 23030EMKD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 225 mm race.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 150 mm bore 23030EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23030EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23030EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 150 mm bearing, and drive-up procedures differ.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 150 mm bearing, and drive-up procedures differ.",
      "The 660/893 kN ratings, 52.9 kN Pu and 7500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23030EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23030EMKD1?",
        "a": "23030EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 150 mm bore, 225 mm OD and 56 mm width (5.906 × 8.858 × 2.205 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 660 kN, C0 893 kN, Pu 52.9 kN, grease limiting speed 2,000 r/min, oil 2,500 r/min, mass about 7500 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23030EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23030EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23030EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23030EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23030EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23030EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 660 kN C / 893 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23030EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23030EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23030emkd1",
      "＊23030emkd1",
      "23030EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24030EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24030EMD1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 225,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 789,
    "static_load_kN": 1140,
    "fatigue_load_limit_kN": 51.2,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2100,
    "weight_g": 10400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 24030EMD1 identifies a 150×225×75 mm (5.906 × 8.858 × 2.953 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 150 mm bore; the 75 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. NTN prints two speeds for 24030EMD1: 1,700 r/min grease and 2,100 r/min oil — the gap of 400 r/min reflects oil cooling of the heavy roller set. Speed planning: 1,700 r/min grease limiting speed is the cage/kinematic ceiling and 2,100 r/min is the oil-lubricated value for the 150 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 150 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 150 mm bore 24030EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24030EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,700 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,700 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Oil relubrication toward 2,100 r/min needs drain and level design; flooding the 75 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 789/1140 kN ratings, 51.2 kN Pu and 10400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24030EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24030EMD1?",
        "a": "24030EMD1 is an NTN double-row spherical roller bearing to ISO 15: 150 mm bore, 225 mm OD and 75 mm width (5.906 × 8.858 × 2.953 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 789 kN, C0 1140 kN, Pu 51.2 kN, grease limiting speed 1,700 r/min, oil 2,100 r/min, mass about 10400 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24030EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24030EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24030EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24030EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24030EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24030EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 789 kN C / 1140 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24030EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24030EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24030emd1",
      "＊24030emd1",
      "24030EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24030EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24030EMK30D1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 225,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 789,
    "static_load_kN": 1140,
    "fatigue_load_limit_kN": 51.2,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2100,
    "weight_g": 10300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24030EMK30D1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 150 mm shaft — 789 kN basic dynamic capacity in a 10300 g, open ISO 15 envelope. Reading the full code: the number gives the 150×225 mm envelope, EM names the cage/capacity execution, K30 marks the 1:30 tapered bore for sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. Open by design, 24030EMK30D1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Catalogue mass 10300 g (10.30 kg) for the 150×225×75 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Fillet radii on shaft and housing must clear the ring chamfers of the 75 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 150 mm bore 24030EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 75 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Do not confuse EA and EM at the same number: 24030EMK30D1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 150×225 mm envelope is identical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 789 kN rating no longer applies.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 789 kN rating no longer applies.",
      "The 789/1140 kN ratings, 51.2 kN Pu and 10300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24030EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24030EMK30D1?",
        "a": "24030EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 150 mm bore, 225 mm OD and 75 mm width (5.906 × 8.858 × 2.953 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 789 kN, C0 1140 kN, Pu 51.2 kN, grease limiting speed 1,700 r/min, oil 2,100 r/min, mass about 10300 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 24030EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 150 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24030EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24030EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24030EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24030EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24030EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 789 kN C / 1140 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24030EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24030EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24030emk30d1",
      "＊24030emk30d1",
      "24030EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23130EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23130EAD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 250,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1060,
    "static_load_kN": 1350,
    "fatigue_load_limit_kN": 65.1,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 2000,
    "weight_g": 15700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 150 mm shaft, NTN supplies 23130EAD1: sphered outer raceway, two roller rows, pressed sheet-steel window cage (EA high-capacity design), oil speed 2,000 r/min. Digit by digit the code reads as spherical-roller dimension series plus 150 mm bore; the 80 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Suffix reading on 23130EAD1: EA identifies the high-capacity execution with a pressed sheet-steel window cage; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. 150 mm bore is 5.906 in and 250 mm OD is 9.843 in; the ISO 15 envelope swaps between brands, but the 1060/1350 kN ratings and cage design are NTN 2203E values. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 150 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 150 mm bore 23130EAD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 150 mm bearing, and drive-up procedures differ.",
      "The cylindrical-bore 23130EAD1 and its tapered-bore counterpart 23130EAKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Do not confuse EA and EM at the same number: 23130EAD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 150×250 mm envelope is identical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 80 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 1060/1350 kN ratings, 65.1 kN Pu and 15700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23130EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23130EAD1?",
        "a": "23130EAD1 is an NTN double-row spherical roller bearing to ISO 15: 150 mm bore, 250 mm OD and 80 mm width (5.906 × 9.843 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1060 kN, C0 1350 kN, Pu 65.1 kN, grease limiting speed 1,600 r/min, oil 2,000 r/min, mass about 15700 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23130EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23130EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23130EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23130EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23130EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23130EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1060 kN C / 1350 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23130EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23130EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23130ead1",
      "＊23130ead1",
      "23130EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23130EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23130EAKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 250,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1060,
    "static_load_kN": 1350,
    "fatigue_load_limit_kN": 65.1,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 2000,
    "weight_g": 15200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23130EAKD1 is the EA pressed-steel-cage execution of NTN's spherical roller range for a 150 mm shaft — 1060 kN basic dynamic capacity in a 15200 g, open ISO 15 envelope. The leading digits are the ISO 15 dimension series (23100 series); the bore code resolves to 150 mm (two-digit code ×5, with the 00–03 exception table), and 250 mm OD / 80 mm width follow the general plan. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Catalogue mass 15200 g (15.20 kg) for the 150×250×80 mm execution includes the EA pressed-steel-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 150 mm set.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 150 mm bore 23130EAKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 150 mm bearing, and drive-up procedures differ.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23130EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23130EAKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23130EAKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 1060/1350 kN ratings, 65.1 kN Pu and 15200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23130EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23130EAKD1?",
        "a": "23130EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 150 mm bore, 250 mm OD and 80 mm width (5.906 × 9.843 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1060 kN, C0 1350 kN, Pu 65.1 kN, grease limiting speed 1,600 r/min, oil 2,000 r/min, mass about 15200 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23130EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23130EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23130EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23130EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23130EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23130EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1060 kN C / 1350 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23130EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23130EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23130eakd1",
      "＊23130eakd1",
      "23130EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23130EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23130EMD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 250,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1060,
    "static_load_kN": 1350,
    "fatigue_load_limit_kN": 65.1,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 2000,
    "weight_g": 15800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23130EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 150 mm bore, 250 mm OD, 80 mm width, rated 1,600 r/min on grease. Reading the full code: the number gives the 150×250 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. 150 mm bore is 5.906 in and 250 mm OD is 9.843 in; the ISO 15 envelope swaps between brands, but the 1060/1350 kN ratings and cage design are NTN 2203E values. Never mount 23130EMD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 250 mm race.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 150 mm bore 23130EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23130EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23130EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23130EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 150 mm bearing, and drive-up procedures differ.",
      "The 1060/1350 kN ratings, 65.1 kN Pu and 15800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23130EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23130EMD1?",
        "a": "23130EMD1 is an NTN double-row spherical roller bearing to ISO 15: 150 mm bore, 250 mm OD and 80 mm width (5.906 × 9.843 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1060 kN, C0 1350 kN, Pu 65.1 kN, grease limiting speed 1,600 r/min, oil 2,000 r/min, mass about 15800 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23130EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23130EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23130EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23130EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23130EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23130EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1060 kN C / 1350 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23130EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23130EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23130emd1",
      "＊23130emd1",
      "23130EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23130EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23130EMKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 250,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1060,
    "static_load_kN": 1350,
    "fatigue_load_limit_kN": 65.1,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 2000,
    "weight_g": 15300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23130EMKD1 identifies a 150×250×80 mm (5.906 × 9.843 × 3.15 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Reading the full code: the number gives the 150×250 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. NTN prints two speeds for 23130EMKD1: 1,600 r/min grease and 2,000 r/min oil — the gap of 400 r/min reflects oil cooling of the heavy roller set. Catalogue mass 15300 g (15.30 kg) for the 150×250×80 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 150 mm bore 23130EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 150 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23130EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Do not confuse EA and EM at the same number: 23130EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 150×250 mm envelope is identical.",
      "Oil relubrication toward 2,000 r/min needs drain and level design; flooding the 80 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 1060/1350 kN ratings, 65.1 kN Pu and 15300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23130EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23130EMKD1?",
        "a": "23130EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 150 mm bore, 250 mm OD and 80 mm width (5.906 × 9.843 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1060 kN, C0 1350 kN, Pu 65.1 kN, grease limiting speed 1,600 r/min, oil 2,000 r/min, mass about 15300 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23130EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23130EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23130EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23130EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23130EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23130EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1060 kN C / 1350 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23130EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23130EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23130emkd1",
      "＊23130emkd1",
      "23130EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24130EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24130EMD1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 250,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1180,
    "static_load_kN": 1590,
    "fatigue_load_limit_kN": 62.8,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 2000,
    "weight_g": 19700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 150 mm shaft, NTN supplies 24130EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 2,000 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 24130EMD1 is assembled exactly in that order. Two symmetric roller rows share the load: C 1180 kN, C0 1590 kN (C0/C ≈ 1.35), with useful axial capacity in either direction alongside the dominant radial load. Pu 62.8 kN against C0 1590 kN anchors the contamination derating; for dirty mining duty the adjusted life of 24130EMD1 moves with cleanliness far more than with small C variations. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 24130EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 150 mm bore 24130EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 150 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1180 kN rating no longer applies.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24130EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 150 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 1180/1590 kN ratings, 62.8 kN Pu and 19700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24130EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24130EMD1?",
        "a": "24130EMD1 is an NTN double-row spherical roller bearing to ISO 15: 150 mm bore, 250 mm OD and 100 mm width (5.906 × 9.843 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1180 kN, C0 1590 kN, Pu 62.8 kN, grease limiting speed 1,600 r/min, oil 2,000 r/min, mass about 19700 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24130EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24130EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24130EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24130EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24130EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24130EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1180 kN C / 1590 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24130EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24130EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24130emd1",
      "＊24130emd1",
      "24130EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24130EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24130EMK30D1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 250,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1180,
    "static_load_kN": 1590,
    "fatigue_load_limit_kN": 62.8,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 2000,
    "weight_g": 19400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24130EMK30D1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 150×250×100 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). Numbering ties 24130EMK30D1 to its envelope and execution: same-number EA versus EM or plain variants share the 150 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Open by design, 24130EMK30D1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Selection: the C0/C ratio of 1.35 (1590/1180 kN) reflects the heavy static and shock proportioning of 24130EMK30D1; size the equivalent load at the required L10 with shock factor for the application. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 150 mm set.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 150 mm bore 24130EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24130EMK30D1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 150 mm bearing, and drive-up procedures differ.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 150 mm bearing, and drive-up procedures differ.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1180 kN rating no longer applies.",
      "The 1180/1590 kN ratings, 62.8 kN Pu and 19400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24130EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24130EMK30D1?",
        "a": "24130EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 150 mm bore, 250 mm OD and 100 mm width (5.906 × 9.843 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1180 kN, C0 1590 kN, Pu 62.8 kN, grease limiting speed 1,600 r/min, oil 2,000 r/min, mass about 19400 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24130EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 150 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24130EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24130EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24130EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24130EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24130EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1180 kN C / 1590 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24130EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24130EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24130emk30d1",
      "＊24130emk30d1",
      "24130EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22230EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22230EAD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 270,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1080,
    "static_load_kN": 1220,
    "fatigue_load_limit_kN": 74.4,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2300,
    "weight_g": 17600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22230EAD1 is the EA pressed-steel-cage execution of NTN's spherical roller range for a 150 mm shaft — 1080 kN basic dynamic capacity in a 17600 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 150 mm bore; the 73 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Pu 74.4 kN is the catalogue fatigue load limit for 22230EAD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Equivalent-load planning keeps a radial plus moderate axial combination on 22230EAD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22230EAD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 150 mm bore 22230EAD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 150 mm bearing, and drive-up procedures differ.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,800 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22230EAD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22230EAD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 1080/1220 kN ratings, 74.4 kN Pu and 17600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22230EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22230EAD1?",
        "a": "22230EAD1 is an NTN double-row spherical roller bearing to ISO 15: 150 mm bore, 270 mm OD and 73 mm width (5.906 × 10.63 × 2.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1080 kN, C0 1220 kN, Pu 74.4 kN, grease limiting speed 1,800 r/min, oil 2,300 r/min, mass about 17600 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22230EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22230EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22230EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22230EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22230EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22230EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1080 kN C / 1220 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22230EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22230EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22230ead1",
      "＊22230ead1",
      "22230EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22230EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22230EAKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 270,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1080,
    "static_load_kN": 1220,
    "fatigue_load_limit_kN": 74.4,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2300,
    "weight_g": 17300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22230EAKD1 is the EA pressed-steel-cage execution of NTN's spherical roller range for a 150 mm shaft — 1080 kN basic dynamic capacity in a 17300 g, open ISO 15 envelope. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (K), lubrication feature (D1); 22230EAKD1 is assembled exactly in that order. Pu 74.4 kN is the catalogue fatigue load limit for 22230EAKD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Speed planning: 1,800 r/min grease limiting speed is the cage/kinematic ceiling and 2,300 r/min is the oil-lubricated value for the 150 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Mount 22230EAKD1 on its adapter or withdrawal sleeve on the 150 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 150 mm bore 22230EAKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1080 kN rating no longer applies.",
      "Oil relubrication toward 2,300 r/min needs drain and level design; flooding the 73 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,800 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22230EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 1080/1220 kN ratings, 74.4 kN Pu and 17300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22230EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22230EAKD1?",
        "a": "22230EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 150 mm bore, 270 mm OD and 73 mm width (5.906 × 10.63 × 2.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1080 kN, C0 1220 kN, Pu 74.4 kN, grease limiting speed 1,800 r/min, oil 2,300 r/min, mass about 17300 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22230EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22230EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22230EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22230EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22230EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22230EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1080 kN C / 1220 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22230EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22230EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22230eakd1",
      "＊22230eakd1",
      "22230EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22230EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22230EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 270,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1080,
    "static_load_kN": 1220,
    "fatigue_load_limit_kN": 74.4,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2300,
    "weight_g": 18000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 22230EMD1 denotes the 150 mm bore spherical roller bearing (1080 kN C / 1220 kN C0) in the 22200 series, the self-aligning choice for heavy combined load. Reading the full code: the number gives the 150×270 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. Two symmetric roller rows share the load: C 1080 kN, C0 1220 kN (C0/C ≈ 1.13), with useful axial capacity in either direction alongside the dominant radial load. Equivalent-load planning keeps a radial plus moderate axial combination on 22230EMD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 150 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 150 mm bore 22230EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22230EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22230EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Oil relubrication toward 2,300 r/min needs drain and level design; flooding the 73 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 150 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 1080/1220 kN ratings, 74.4 kN Pu and 18000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22230EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22230EMD1?",
        "a": "22230EMD1 is an NTN double-row spherical roller bearing to ISO 15: 150 mm bore, 270 mm OD and 73 mm width (5.906 × 10.63 × 2.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1080 kN, C0 1220 kN, Pu 74.4 kN, grease limiting speed 1,800 r/min, oil 2,300 r/min, mass about 18000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22230EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22230EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22230EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22230EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22230EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22230EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1080 kN C / 1220 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22230EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22230EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22230emd1",
      "＊22230emd1",
      "22230EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22230EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22230EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 270,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1080,
    "static_load_kN": 1220,
    "fatigue_load_limit_kN": 74.4,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2300,
    "weight_g": 17700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22230EMKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 150×270×73 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). Digit by digit the code reads as spherical-roller dimension series plus 150 mm bore; the 73 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Open by design, 22230EMKD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Pu 74.4 kN against C0 1220 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22230EMKD1 moves with cleanliness far more than with small C variations. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 150 mm set.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 150 mm bore 22230EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 22230EMKD1 by envelope alone: the 1220 kN C0 and 74.4 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22230EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22230EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1080 kN rating no longer applies.",
      "The 1080/1220 kN ratings, 74.4 kN Pu and 17700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22230EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22230EMKD1?",
        "a": "22230EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 150 mm bore, 270 mm OD and 73 mm width (5.906 × 10.63 × 2.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1080 kN, C0 1220 kN, Pu 74.4 kN, grease limiting speed 1,800 r/min, oil 2,300 r/min, mass about 17700 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22230EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22230EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22230EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22230EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22230EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22230EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1080 kN C / 1220 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22230EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22230EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22230emkd1",
      "＊22230emkd1",
      "22230EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23230EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23230EMD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 270,
    "B_mm": 96,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1340,
    "static_load_kN": 1620,
    "fatigue_load_limit_kN": 74,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1900,
    "weight_g": 23600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23230EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 150 mm shaft — 1340 kN basic dynamic capacity in a 23600 g, open ISO 15 envelope. Numbering ties 23230EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 150 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. NTN prints two speeds for 23230EMD1: 1,500 r/min grease and 1,900 r/min oil — the gap of 400 r/min reflects oil cooling of the heavy roller set. Equivalent-load planning keeps a radial plus moderate axial combination on 23230EMD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Never mount 23230EMD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 270 mm race.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 150 mm bore 23230EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23230EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Oil relubrication toward 1,900 r/min needs drain and level design; flooding the 96 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 150 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Oil relubrication toward 1,900 r/min needs drain and level design; flooding the 96 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 1340/1620 kN ratings, 74 kN Pu and 23600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23230EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23230EMD1?",
        "a": "23230EMD1 is an NTN double-row spherical roller bearing to ISO 15: 150 mm bore, 270 mm OD and 96 mm width (5.906 × 10.63 × 3.78 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1340 kN, C0 1620 kN, Pu 74 kN, grease limiting speed 1,500 r/min, oil 1,900 r/min, mass about 23600 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23230EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23230EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23230EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23230EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23230EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23230EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1340 kN C / 1620 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23230EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23230EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23230emd1",
      "＊23230emd1",
      "23230EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23230EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23230EMKD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 270,
    "B_mm": 96,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1340,
    "static_load_kN": 1620,
    "fatigue_load_limit_kN": 74,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1900,
    "weight_g": 22900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23230EMKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 150×270×96 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). Numbering ties 23230EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 150 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. At 1340 kN C and 22900 g mass the 23200 series part is built for shock and vibration; the 96 mm-wide ring needs square abutments to keep both rows equally loaded. Pu 74 kN against C0 1620 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23230EMKD1 moves with cleanliness far more than with small C variations. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 150 mm set.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 150 mm bore 23230EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1340 kN rating no longer applies.",
      "Oil relubrication toward 1,900 r/min needs drain and level design; flooding the 96 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Do not confuse EA and EM at the same number: 23230EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 150×270 mm envelope is identical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,500 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1340/1620 kN ratings, 74 kN Pu and 22900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23230EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23230EMKD1?",
        "a": "23230EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 150 mm bore, 270 mm OD and 96 mm width (5.906 × 10.63 × 3.78 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1340 kN, C0 1620 kN, Pu 74 kN, grease limiting speed 1,500 r/min, oil 1,900 r/min, mass about 22900 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23230EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23230EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23230EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23230EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23230EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23230EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1340 kN C / 1620 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23230EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23230EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23230emkd1",
      "＊23230emkd1",
      "23230EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22330EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22330EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 320,
    "B_mm": 108,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1740,
    "static_load_kN": 1890,
    "fatigue_load_limit_kN": 98.9,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1700,
    "weight_g": 42200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22330EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 150 mm bore, 320 mm OD, 108 mm width, rated 1,400 r/min on grease. Numbering ties 22330EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 150 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. At 1740 kN C and 42200 g mass the 22300 series part is built for shock and vibration; the 108 mm-wide ring needs square abutments to keep both rows equally loaded. Selection: the C0/C ratio of 1.09 (1890/1740 kN) reflects the heavy static and shock proportioning of 22330EMD1; size the equivalent load at the required L10 with shock factor for the application. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 150 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 150 mm bore 22330EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22330EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Never substitute 22330EMD1 by envelope alone: the 1890 kN C0 and 98.9 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The cylindrical-bore 22330EMD1 and its tapered-bore counterpart 22330EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,400 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1740/1890 kN ratings, 98.9 kN Pu and 42200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22330EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22330EMD1?",
        "a": "22330EMD1 is an NTN double-row spherical roller bearing to ISO 15: 150 mm bore, 320 mm OD and 108 mm width (5.906 × 12.598 × 4.252 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1740 kN, C0 1890 kN, Pu 98.9 kN, grease limiting speed 1,400 r/min, oil 1,700 r/min, mass about 42200 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22330EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22330EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22330EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22330EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22330EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22330EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1740 kN C / 1890 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22330EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22330EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22330emd1",
      "＊22330emd1",
      "22330EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22330EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22330EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 320,
    "B_mm": 108,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1740,
    "static_load_kN": 1890,
    "fatigue_load_limit_kN": 98.9,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1700,
    "weight_g": 41300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22330EMKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 150 mm bore, 320 mm OD, 108 mm width, rated 1,400 r/min on grease. Reading the full code: the number gives the 150×320 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. Selection: the C0/C ratio of 1.09 (1890/1740 kN) reflects the heavy static and shock proportioning of 22330EMKD1; size the equivalent load at the required L10 with shock factor for the application. Fillet radii on shaft and housing must clear the ring chamfers of the 108 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 150 mm bore 22330EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,400 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Oil relubrication toward 1,700 r/min needs drain and level design; flooding the 108 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Oil relubrication toward 1,700 r/min needs drain and level design; flooding the 108 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Never substitute 22330EMKD1 by envelope alone: the 1890 kN C0 and 98.9 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 1740/1890 kN ratings, 98.9 kN Pu and 41300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22330EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22330EMKD1?",
        "a": "22330EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 150 mm bore, 320 mm OD and 108 mm width (5.906 × 12.598 × 4.252 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1740 kN, C0 1890 kN, Pu 98.9 kN, grease limiting speed 1,400 r/min, oil 1,700 r/min, mass about 41300 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22330EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22330EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22330EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22330EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22330EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22330EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1740 kN C / 1890 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22330EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22330EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22330emkd1",
      "＊22330emkd1",
      "22330EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23932EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23932EMD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 220,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 455,
    "static_load_kN": 683,
    "fatigue_load_limit_kN": 45.6,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2400,
    "weight_g": 5090,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23932EMD1 belongs to the 23900 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 160 mm (two-digit code ×5, with the 00–03 exception table), and 220 mm OD / 45 mm width follow the general plan. Pu 45.6 kN is the catalogue fatigue load limit for 23932EMD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. The 30.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 45 mm-wide ring seats fully on both sides. Never mount 23932EMD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 220 mm race.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 160 mm bore 23932EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The cylindrical-bore 23932EMD1 and its tapered-bore counterpart 23932EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 45 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Do not confuse EA and EM at the same number: 23932EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 160×220 mm envelope is identical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23932EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 455/683 kN ratings, 45.6 kN Pu and 5090 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23932EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23932EMD1?",
        "a": "23932EMD1 is an NTN double-row spherical roller bearing to ISO 15: 160 mm bore, 220 mm OD and 45 mm width (6.299 × 8.661 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 455 kN, C0 683 kN, Pu 45.6 kN, grease limiting speed 1,900 r/min, oil 2,400 r/min, mass about 5090 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23932EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23932EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23932EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23932EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23932EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23932EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 455 kN C / 683 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23932EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23932EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23932emd1",
      "＊23932emd1",
      "23932EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23932EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23932EMKD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 220,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 455,
    "static_load_kN": 683,
    "fatigue_load_limit_kN": 45.6,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2400,
    "weight_g": 4940,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23932EMKD1 identifies a 160×220×45 mm (6.299 × 8.661 × 1.772 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 160 mm (two-digit code ×5, with the 00–03 exception table), and 220 mm OD / 45 mm width follow the general plan. The 1:12 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 160 mm bore assembly. Selection: the C0/C ratio of 1.50 (683/455 kN) reflects the heavy static and shock proportioning of 23932EMKD1; size the equivalent load at the required L10 with shock factor for the application. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 23932EMKD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 160 mm bore 23932EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 23932EMKD1 by envelope alone: the 683 kN C0 and 45.6 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 160 mm bearing, and drive-up procedures differ.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 45 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Do not confuse EA and EM at the same number: 23932EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 160×220 mm envelope is identical.",
      "The 455/683 kN ratings, 45.6 kN Pu and 4940 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23932EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23932EMKD1?",
        "a": "23932EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 160 mm bore, 220 mm OD and 45 mm width (6.299 × 8.661 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 455 kN, C0 683 kN, Pu 45.6 kN, grease limiting speed 1,900 r/min, oil 2,400 r/min, mass about 4940 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23932EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23932EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23932EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23932EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23932EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23932EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 455 kN C / 683 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23932EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23932EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23932emkd1",
      "＊23932emkd1",
      "23932EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23032EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23032EAD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 240,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 748,
    "static_load_kN": 1000,
    "fatigue_load_limit_kN": 59.1,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2300,
    "weight_g": 9320,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23032EAD1 identifies a 160×240×60 mm (6.299 × 9.449 × 2.362 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 160 mm bore; the 60 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Speed planning: 1,800 r/min grease limiting speed is the cage/kinematic ceiling and 2,300 r/min is the oil-lubricated value for the 160 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 160 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 160 mm bore 23032EAD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,800 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 748 kN rating no longer applies.",
      "Never substitute 23032EAD1 by envelope alone: the 1000 kN C0 and 59.1 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 160 mm bearing, and drive-up procedures differ.",
      "The 748/1000 kN ratings, 59.1 kN Pu and 9320 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23032EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23032EAD1?",
        "a": "23032EAD1 is an NTN double-row spherical roller bearing to ISO 15: 160 mm bore, 240 mm OD and 60 mm width (6.299 × 9.449 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 748 kN, C0 1000 kN, Pu 59.1 kN, grease limiting speed 1,800 r/min, oil 2,300 r/min, mass about 9320 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23032EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23032EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23032EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23032EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23032EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23032EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 748 kN C / 1000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23032EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23032EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23032ead1",
      "＊23032ead1",
      "23032EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23032EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23032EAKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 240,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 748,
    "static_load_kN": 1000,
    "fatigue_load_limit_kN": 59.1,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2300,
    "weight_g": 9030,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23032EAKD1 belongs to the 23000 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (K), lubrication feature (D1); 23032EAKD1 is assembled exactly in that order. Open by design, 23032EAKD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Pu 59.1 kN against C0 1000 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23032EAKD1 moves with cleanliness far more than with small C variations. Fillet radii on shaft and housing must clear the ring chamfers of the 60 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 160 mm bore 23032EAKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23032EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Never substitute 23032EAKD1 by envelope alone: the 1000 kN C0 and 59.1 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 60 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 748 kN rating no longer applies.",
      "The 748/1000 kN ratings, 59.1 kN Pu and 9030 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23032EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23032EAKD1?",
        "a": "23032EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 160 mm bore, 240 mm OD and 60 mm width (6.299 × 9.449 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 748 kN, C0 1000 kN, Pu 59.1 kN, grease limiting speed 1,800 r/min, oil 2,300 r/min, mass about 9030 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23032EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23032EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23032EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23032EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23032EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23032EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 748 kN C / 1000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23032EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23032EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23032eakd1",
      "＊23032eakd1",
      "23032EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23032EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23032EMD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 240,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 748,
    "static_load_kN": 1000,
    "fatigue_load_limit_kN": 59.1,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2300,
    "weight_g": 9370,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23032EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 160 mm shaft — 748 kN basic dynamic capacity in a 9370 g, open ISO 15 envelope. Reading the full code: the number gives the 160×240 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Speed planning: 1,800 r/min grease limiting speed is the cage/kinematic ceiling and 2,300 r/min is the oil-lubricated value for the 160 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Never mount 23032EMD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 240 mm race.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 160 mm bore 23032EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 23032EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 160×240 mm envelope is identical.",
      "Do not confuse EA and EM at the same number: 23032EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 160×240 mm envelope is identical.",
      "Do not confuse EA and EM at the same number: 23032EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 160×240 mm envelope is identical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23032EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 748/1000 kN ratings, 59.1 kN Pu and 9370 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23032EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23032EMD1?",
        "a": "23032EMD1 is an NTN double-row spherical roller bearing to ISO 15: 160 mm bore, 240 mm OD and 60 mm width (6.299 × 9.449 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 748 kN, C0 1000 kN, Pu 59.1 kN, grease limiting speed 1,800 r/min, oil 2,300 r/min, mass about 9370 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23032EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23032EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23032EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23032EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23032EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23032EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 748 kN C / 1000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23032EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23032EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23032emd1",
      "＊23032emd1",
      "23032EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23032EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23032EMKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 240,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 748,
    "static_load_kN": 1000,
    "fatigue_load_limit_kN": 59.1,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2300,
    "weight_g": 9090,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23032EMKD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 160 mm shaft — 748 kN basic dynamic capacity in a 9090 g, open ISO 15 envelope. The leading digits are the ISO 15 dimension series (23000 series); the bore code resolves to 160 mm (two-digit code ×5, with the 00–03 exception table), and 240 mm OD / 60 mm width follow the general plan. NTN prints two speeds for 23032EMKD1: 1,800 r/min grease and 2,300 r/min oil — the gap of 500 r/min reflects oil cooling of the heavy roller set. Pu 59.1 kN against C0 1000 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23032EMKD1 moves with cleanliness far more than with small C variations. Fillet radii on shaft and housing must clear the ring chamfers of the 60 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 160 mm bore 23032EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 2,300 r/min needs drain and level design; flooding the 60 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 160 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23032EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Oil relubrication toward 2,300 r/min needs drain and level design; flooding the 60 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 748/1000 kN ratings, 59.1 kN Pu and 9090 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23032EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23032EMKD1?",
        "a": "23032EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 160 mm bore, 240 mm OD and 60 mm width (6.299 × 9.449 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 748 kN, C0 1000 kN, Pu 59.1 kN, grease limiting speed 1,800 r/min, oil 2,300 r/min, mass about 9090 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23032EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23032EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23032EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23032EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23032EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23032EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 748 kN C / 1000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23032EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23032EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23032emkd1",
      "＊23032emkd1",
      "23032EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24032EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24032EMD1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 240,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 901,
    "static_load_kN": 1290,
    "fatigue_load_limit_kN": 56.8,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 2000,
    "weight_g": 12600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 24032EMD1 identifies a 160×240×80 mm (6.299 × 9.449 × 3.15 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 24032EMD1 is assembled exactly in that order. Open by design, 24032EMD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Equivalent-load planning keeps a radial plus moderate axial combination on 24032EMD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 24032EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 160 mm bore 24032EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 160 mm bearing, and drive-up procedures differ.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24032EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Do not confuse EA and EM at the same number: 24032EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 160×240 mm envelope is identical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 901 kN rating no longer applies.",
      "The 901/1290 kN ratings, 56.8 kN Pu and 12600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24032EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24032EMD1?",
        "a": "24032EMD1 is an NTN double-row spherical roller bearing to ISO 15: 160 mm bore, 240 mm OD and 80 mm width (6.299 × 9.449 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 901 kN, C0 1290 kN, Pu 56.8 kN, grease limiting speed 1,600 r/min, oil 2,000 r/min, mass about 12600 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24032EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24032EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24032EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24032EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24032EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24032EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 901 kN C / 1290 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24032EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24032EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24032emd1",
      "＊24032emd1",
      "24032EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24032EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24032EMK30D1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 240,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 901,
    "static_load_kN": 1290,
    "fatigue_load_limit_kN": 56.8,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 2000,
    "weight_g": 12400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 24032EMK30D1 identifies a 160×240×80 mm (6.299 × 9.449 × 3.15 in) spherical roller bearing, 1:30 tapered bore (K30), to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 160 mm bore; the 80 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Pu 56.8 kN against C0 1290 kN anchors the contamination derating; for dirty mining duty the adjusted life of 24032EMK30D1 moves with cleanliness far more than with small C variations. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 160 mm bore 24032EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24032EMK30D1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 24032EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24032EMK30D1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24032EMK30D1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 901/1290 kN ratings, 56.8 kN Pu and 12400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24032EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24032EMK30D1?",
        "a": "24032EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 160 mm bore, 240 mm OD and 80 mm width (6.299 × 9.449 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 901 kN, C0 1290 kN, Pu 56.8 kN, grease limiting speed 1,600 r/min, oil 2,000 r/min, mass about 12400 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 24032EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 160 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24032EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24032EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24032EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24032EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24032EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 901 kN C / 1290 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24032EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24032EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24032emk30d1",
      "＊24032emk30d1",
      "24032EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23132EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23132EAD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 270,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1220,
    "static_load_kN": 1580,
    "fatigue_load_limit_kN": 73.6,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1900,
    "weight_g": 20100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 160 mm shaft, NTN supplies 23132EAD1: sphered outer raceway, two roller rows, pressed sheet-steel window cage (EA high-capacity design), oil speed 1,900 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (cylindrical), lubrication feature (D1); 23132EAD1 is assembled exactly in that order. The cylindrical bore fits a machined 160 mm shaft seat directly; the same envelope in 23132EAKD1 (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Pu 73.6 kN against C0 1580 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23132EAD1 moves with cleanliness far more than with small C variations. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 23132EAD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 160 mm bore 23132EAD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 23132EAD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 160×270 mm envelope is identical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 160 mm bearing, and drive-up procedures differ.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 86 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Do not confuse EA and EM at the same number: 23132EAD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 160×270 mm envelope is identical.",
      "The 1220/1580 kN ratings, 73.6 kN Pu and 20100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23132EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23132EAD1?",
        "a": "23132EAD1 is an NTN double-row spherical roller bearing to ISO 15: 160 mm bore, 270 mm OD and 86 mm width (6.299 × 10.63 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1220 kN, C0 1580 kN, Pu 73.6 kN, grease limiting speed 1,500 r/min, oil 1,900 r/min, mass about 20100 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23132EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23132EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23132EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23132EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23132EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23132EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1220 kN C / 1580 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23132EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23132EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23132ead1",
      "＊23132ead1",
      "23132EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23132EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23132EAKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 270,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1220,
    "static_load_kN": 1580,
    "fatigue_load_limit_kN": 73.6,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1900,
    "weight_g": 19500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23132EAKD1 denotes the 160 mm bore spherical roller bearing (1220 kN C / 1580 kN C0) in the 23100 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (23100 series); the bore code resolves to 160 mm (two-digit code ×5, with the 00–03 exception table), and 270 mm OD / 86 mm width follow the general plan. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EA pressed-steel-cage cage. Pu 73.6 kN against C0 1580 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23132EAKD1 moves with cleanliness far more than with small C variations. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 160 mm bore 23132EAKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 160 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Do not confuse EA and EM at the same number: 23132EAKD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 160×270 mm envelope is identical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,500 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Never substitute 23132EAKD1 by envelope alone: the 1580 kN C0 and 73.6 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 1220/1580 kN ratings, 73.6 kN Pu and 19500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23132EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23132EAKD1?",
        "a": "23132EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 160 mm bore, 270 mm OD and 86 mm width (6.299 × 10.63 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1220 kN, C0 1580 kN, Pu 73.6 kN, grease limiting speed 1,500 r/min, oil 1,900 r/min, mass about 19500 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23132EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23132EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23132EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23132EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23132EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23132EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1220 kN C / 1580 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23132EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23132EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23132eakd1",
      "＊23132eakd1",
      "23132EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23132EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23132EMD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 270,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1220,
    "static_load_kN": 1580,
    "fatigue_load_limit_kN": 73.6,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1900,
    "weight_g": 20200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 160 mm shaft, NTN supplies 23132EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,900 r/min. Numbering ties 23132EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 160 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. Catalogue mass 20200 g (20.20 kg) for the 160×270×86 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Never mount 23132EMD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 270 mm race.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 160 mm bore 23132EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 86 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23132EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 160 mm bearing, and drive-up procedures differ.",
      "Never substitute 23132EMD1 by envelope alone: the 1580 kN C0 and 73.6 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 1220/1580 kN ratings, 73.6 kN Pu and 20200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23132EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23132EMD1?",
        "a": "23132EMD1 is an NTN double-row spherical roller bearing to ISO 15: 160 mm bore, 270 mm OD and 86 mm width (6.299 × 10.63 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1220 kN, C0 1580 kN, Pu 73.6 kN, grease limiting speed 1,500 r/min, oil 1,900 r/min, mass about 20200 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23132EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23132EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23132EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23132EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23132EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23132EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1220 kN C / 1580 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23132EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23132EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23132emd1",
      "＊23132emd1",
      "23132EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23132EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23132EMKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 270,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1220,
    "static_load_kN": 1580,
    "fatigue_load_limit_kN": 73.6,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1900,
    "weight_g": 19600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23132EMKD1 identifies a 160×270×86 mm (6.299 × 10.63 × 3.386 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Reading the full code: the number gives the 160×270 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. At 1220 kN C and 19600 g mass the 23100 series part is built for shock and vibration; the 86 mm-wide ring needs square abutments to keep both rows equally loaded. Speed planning: 1,500 r/min grease limiting speed is the cage/kinematic ceiling and 1,900 r/min is the oil-lubricated value for the 160 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Never mount 23132EMKD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 270 mm race.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 160 mm bore 23132EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 23132EMKD1 by envelope alone: the 1580 kN C0 and 73.6 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Never substitute 23132EMKD1 by envelope alone: the 1580 kN C0 and 73.6 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23132EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,500 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1220/1580 kN ratings, 73.6 kN Pu and 19600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23132EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23132EMKD1?",
        "a": "23132EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 160 mm bore, 270 mm OD and 86 mm width (6.299 × 10.63 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1220 kN, C0 1580 kN, Pu 73.6 kN, grease limiting speed 1,500 r/min, oil 1,900 r/min, mass about 19600 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23132EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23132EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23132EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23132EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23132EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23132EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1220 kN C / 1580 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23132EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23132EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23132emkd1",
      "＊23132emkd1",
      "23132EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24132EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24132EMD1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 270,
    "B_mm": 109,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1360,
    "static_load_kN": 1860,
    "fatigue_load_limit_kN": 70.6,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1800,
    "weight_g": 25400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24132EMD1 belongs to the 24100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 160 mm (two-digit code ×5, with the 00–03 exception table), and 270 mm OD / 109 mm width follow the general plan. The cylindrical bore fits a machined 160 mm shaft seat directly; the same envelope in 24132EMK30D1 (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Selection: the C0/C ratio of 1.37 (1860/1360 kN) reflects the heavy static and shock proportioning of 24132EMD1; size the equivalent load at the required L10 with shock factor for the application. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 24132EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 160 mm bore 24132EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24132EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Oil relubrication toward 1,800 r/min needs drain and level design; flooding the 109 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 160 mm bearing, and drive-up procedures differ.",
      "Do not confuse EA and EM at the same number: 24132EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 160×270 mm envelope is identical.",
      "The 1360/1860 kN ratings, 70.6 kN Pu and 25400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24132EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24132EMD1?",
        "a": "24132EMD1 is an NTN double-row spherical roller bearing to ISO 15: 160 mm bore, 270 mm OD and 109 mm width (6.299 × 10.63 × 4.291 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1360 kN, C0 1860 kN, Pu 70.6 kN, grease limiting speed 1,500 r/min, oil 1,800 r/min, mass about 25400 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24132EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24132EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24132EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24132EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24132EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24132EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1360 kN C / 1860 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24132EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24132EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24132emd1",
      "＊24132emd1",
      "24132EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24132EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24132EMK30D1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 270,
    "B_mm": 109,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1360,
    "static_load_kN": 1860,
    "fatigue_load_limit_kN": 70.6,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1800,
    "weight_g": 25100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 160 mm shaft, NTN supplies 24132EMK30D1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,800 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K30), lubrication feature (D1); 24132EMK30D1 is assembled exactly in that order. The 1:30 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 160 mm bore assembly. The 55.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 109 mm-wide ring seats fully on both sides. Never mount 24132EMK30D1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 270 mm race.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 160 mm bore 24132EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 160 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Never substitute 24132EMK30D1 by envelope alone: the 1860 kN C0 and 70.6 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Do not confuse EA and EM at the same number: 24132EMK30D1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 160×270 mm envelope is identical.",
      "Do not confuse EA and EM at the same number: 24132EMK30D1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 160×270 mm envelope is identical.",
      "The 1360/1860 kN ratings, 70.6 kN Pu and 25100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24132EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24132EMK30D1?",
        "a": "24132EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 160 mm bore, 270 mm OD and 109 mm width (6.299 × 10.63 × 4.291 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1360 kN, C0 1860 kN, Pu 70.6 kN, grease limiting speed 1,500 r/min, oil 1,800 r/min, mass about 25100 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24132EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 160 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24132EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24132EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24132EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24132EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24132EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1360 kN C / 1860 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24132EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24132EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24132emk30d1",
      "＊24132emk30d1",
      "24132EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22232EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22232EAD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1220,
    "static_load_kN": 1390,
    "fatigue_load_limit_kN": 84.1,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2100,
    "weight_g": 22300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22232EAD1 is the EA pressed-steel-cage execution of NTN's spherical roller range for a 160 mm shaft — 1220 kN basic dynamic capacity in a 22300 g, open ISO 15 envelope. Numbering ties 22232EAD1 to its envelope and execution: same-number EA versus EM or plain variants share the 160 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Equivalent-load planning keeps a radial plus moderate axial combination on 22232EAD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Never mount 22232EAD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 290 mm race.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 160 mm bore 22232EAD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,700 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22232EAD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22232EAD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 160 mm bearing, and drive-up procedures differ.",
      "The 1220/1390 kN ratings, 84.1 kN Pu and 22300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22232EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22232EAD1?",
        "a": "22232EAD1 is an NTN double-row spherical roller bearing to ISO 15: 160 mm bore, 290 mm OD and 80 mm width (6.299 × 11.417 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1220 kN, C0 1390 kN, Pu 84.1 kN, grease limiting speed 1,700 r/min, oil 2,100 r/min, mass about 22300 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22232EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22232EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22232EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22232EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22232EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22232EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1220 kN C / 1390 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22232EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22232EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22232ead1",
      "＊22232ead1",
      "22232EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22232EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22232EAKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1220,
    "static_load_kN": 1390,
    "fatigue_load_limit_kN": 84.1,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2100,
    "weight_g": 21800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 22232EAKD1 denotes the 160 mm bore spherical roller bearing (1220 kN C / 1390 kN C0) in the 22200 series, the self-aligning choice for heavy combined load. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (K), lubrication feature (D1); 22232EAKD1 is assembled exactly in that order. At 1220 kN C and 21800 g mass the 22200 series part is built for shock and vibration; the 80 mm-wide ring needs square abutments to keep both rows equally loaded. The 65.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 80 mm-wide ring seats fully on both sides. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 160 mm bore 22232EAKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22232EAD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22232EAKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Never substitute 22232EAKD1 by envelope alone: the 1390 kN C0 and 84.1 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,700 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1220/1390 kN ratings, 84.1 kN Pu and 21800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22232EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22232EAKD1?",
        "a": "22232EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 160 mm bore, 290 mm OD and 80 mm width (6.299 × 11.417 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1220 kN, C0 1390 kN, Pu 84.1 kN, grease limiting speed 1,700 r/min, oil 2,100 r/min, mass about 21800 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22232EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22232EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22232EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22232EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22232EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22232EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1220 kN C / 1390 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22232EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22232EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22232eakd1",
      "＊22232eakd1",
      "22232EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22232EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22232EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1220,
    "static_load_kN": 1390,
    "fatigue_load_limit_kN": 84.1,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2100,
    "weight_g": 22900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 22232EMD1 denotes the 160 mm bore spherical roller bearing (1220 kN C / 1390 kN C0) in the 22200 series, the self-aligning choice for heavy combined load. Numbering ties 22232EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 160 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. 160 mm bore is 6.299 in and 290 mm OD is 11.417 in; the ISO 15 envelope swaps between brands, but the 1220/1390 kN ratings and cage design are NTN 2203E values. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 160 mm set.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 160 mm bore 22232EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 80 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 22232EMD1 by envelope alone: the 1390 kN C0 and 84.1 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1220 kN rating no longer applies.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22232EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 1220/1390 kN ratings, 84.1 kN Pu and 22900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22232EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22232EMD1?",
        "a": "22232EMD1 is an NTN double-row spherical roller bearing to ISO 15: 160 mm bore, 290 mm OD and 80 mm width (6.299 × 11.417 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1220 kN, C0 1390 kN, Pu 84.1 kN, grease limiting speed 1,700 r/min, oil 2,100 r/min, mass about 22900 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22232EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22232EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22232EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22232EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22232EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22232EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1220 kN C / 1390 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22232EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22232EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22232emd1",
      "＊22232emd1",
      "22232EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22232EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22232EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1220,
    "static_load_kN": 1390,
    "fatigue_load_limit_kN": 84.1,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2100,
    "weight_g": 22400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22232EMKD1 identifies a 160×290×80 mm (6.299 × 11.417 × 3.15 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 160 mm bore; the 80 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The 1:12 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 160 mm bore assembly. Speed planning: 1,700 r/min grease limiting speed is the cage/kinematic ceiling and 2,100 r/min is the oil-lubricated value for the 160 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 160 mm bore 22232EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 22232EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 160×290 mm envelope is identical.",
      "Do not confuse EA and EM at the same number: 22232EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 160×290 mm envelope is identical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 160 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Do not confuse EA and EM at the same number: 22232EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 160×290 mm envelope is identical.",
      "The 1220/1390 kN ratings, 84.1 kN Pu and 22400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22232EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22232EMKD1?",
        "a": "22232EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 160 mm bore, 290 mm OD and 80 mm width (6.299 × 11.417 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1220 kN, C0 1390 kN, Pu 84.1 kN, grease limiting speed 1,700 r/min, oil 2,100 r/min, mass about 22400 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22232EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22232EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22232EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22232EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22232EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22232EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1220 kN C / 1390 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22232EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22232EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22232emkd1",
      "＊22232emkd1",
      "22232EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23232EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23232EMD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 104,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1550,
    "static_load_kN": 1890,
    "fatigue_load_limit_kN": 83.8,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1800,
    "weight_g": 29600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23232EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 160 mm shaft — 1550 kN basic dynamic capacity in a 29600 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 160 mm bore; the 104 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Open by design, 23232EMD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. With about 9.7 kN of C per millimetre of the 160 mm bore, 23232EMD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 160 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 160 mm bore 23232EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 160 mm bearing, and drive-up procedures differ.",
      "Do not confuse EA and EM at the same number: 23232EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 160×290 mm envelope is identical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1550 kN rating no longer applies.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1550 kN rating no longer applies.",
      "The 1550/1890 kN ratings, 83.8 kN Pu and 29600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23232EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23232EMD1?",
        "a": "23232EMD1 is an NTN double-row spherical roller bearing to ISO 15: 160 mm bore, 290 mm OD and 104 mm width (6.299 × 11.417 × 4.094 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1550 kN, C0 1890 kN, Pu 83.8 kN, grease limiting speed 1,400 r/min, oil 1,800 r/min, mass about 29600 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23232EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23232EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23232EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23232EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23232EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23232EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1550 kN C / 1890 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23232EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23232EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23232emd1",
      "＊23232emd1",
      "23232EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23232EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23232EMKD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 104,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1550,
    "static_load_kN": 1890,
    "fatigue_load_limit_kN": 83.8,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1800,
    "weight_g": 28800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23232EMKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 160×290×104 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). Numbering ties 23232EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 160 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Suffix reading on 23232EMKD1: EM identifies the high-capacity execution with a one-piece machined brass cage; K marks the 1:12 tapered bore; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. Speed planning: 1,400 r/min grease limiting speed is the cage/kinematic ceiling and 1,800 r/min is the oil-lubricated value for the 160 mm bore; vibrating screens rarely approach either and are load/cage limited instead. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 160 mm set.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 160 mm bore 23232EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23232EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Do not confuse EA and EM at the same number: 23232EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 160×290 mm envelope is identical.",
      "Oil relubrication toward 1,800 r/min needs drain and level design; flooding the 104 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 104 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 1550/1890 kN ratings, 83.8 kN Pu and 28800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23232EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23232EMKD1?",
        "a": "23232EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 160 mm bore, 290 mm OD and 104 mm width (6.299 × 11.417 × 4.094 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1550 kN, C0 1890 kN, Pu 83.8 kN, grease limiting speed 1,400 r/min, oil 1,800 r/min, mass about 28800 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23232EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23232EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23232EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23232EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23232EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23232EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1550 kN C / 1890 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23232EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23232EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23232emkd1",
      "＊23232emkd1",
      "23232EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22332EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22332EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 340,
    "B_mm": 114,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1950,
    "static_load_kN": 2210,
    "fatigue_load_limit_kN": 109,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1600,
    "weight_g": 50500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22332EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 160 mm bore, 340 mm OD, 114 mm width, rated 1,300 r/min on grease. Digit by digit the code reads as spherical-roller dimension series plus 160 mm bore; the 114 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. Equivalent-load planning keeps a radial plus moderate axial combination on 22332EMD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 160 mm set.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 160 mm bore 22332EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 160 mm bearing, and drive-up procedures differ.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 114 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 22332EMD1 by envelope alone: the 2210 kN C0 and 109 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Never substitute 22332EMD1 by envelope alone: the 2210 kN C0 and 109 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 1950/2210 kN ratings, 109 kN Pu and 50500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22332EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22332EMD1?",
        "a": "22332EMD1 is an NTN double-row spherical roller bearing to ISO 15: 160 mm bore, 340 mm OD and 114 mm width (6.299 × 13.386 × 4.488 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1950 kN, C0 2210 kN, Pu 109 kN, grease limiting speed 1,300 r/min, oil 1,600 r/min, mass about 50500 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22332EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22332EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22332EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22332EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22332EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22332EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1950 kN C / 2210 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22332EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22332EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22332emd1",
      "＊22332emd1",
      "22332EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22332EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22332EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 340,
    "B_mm": 114,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1950,
    "static_load_kN": 2210,
    "fatigue_load_limit_kN": 109,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1600,
    "weight_g": 49500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22332EMKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 160×340×114 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). Reading the full code: the number gives the 160×340 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Equivalent-load planning keeps a radial plus moderate axial combination on 22332EMKD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 160 mm set.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 160 mm bore 22332EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 160 mm bearing, and drive-up procedures differ.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22332EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 160 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22332EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 1950/2210 kN ratings, 109 kN Pu and 49500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22332EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22332EMKD1?",
        "a": "22332EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 160 mm bore, 340 mm OD and 114 mm width (6.299 × 13.386 × 4.488 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1950 kN, C0 2210 kN, Pu 109 kN, grease limiting speed 1,300 r/min, oil 1,600 r/min, mass about 49500 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22332EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22332EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22332EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22332EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22332EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22332EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1950 kN C / 2210 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22332EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22332EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22332emkd1",
      "＊22332emkd1",
      "22332EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23934EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23934EMD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 230,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 468,
    "static_load_kN": 723,
    "fatigue_load_limit_kN": 48.8,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2300,
    "weight_g": 5390,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23934EMD1 belongs to the 23900 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 23934EMD1 is assembled exactly in that order. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Equivalent-load planning keeps a radial plus moderate axial combination on 23934EMD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 170 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 170 mm bore 23934EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 468 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 170 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 45 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23934EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 468/723 kN ratings, 48.8 kN Pu and 5390 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23934EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23934EMD1?",
        "a": "23934EMD1 is an NTN double-row spherical roller bearing to ISO 15: 170 mm bore, 230 mm OD and 45 mm width (6.693 × 9.055 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 468 kN, C0 723 kN, Pu 48.8 kN, grease limiting speed 1,800 r/min, oil 2,300 r/min, mass about 5390 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23934EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23934EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23934EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23934EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23934EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23934EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 468 kN C / 723 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23934EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23934EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23934emd1",
      "＊23934emd1",
      "23934EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23934EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23934EMKD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 230,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 468,
    "static_load_kN": 723,
    "fatigue_load_limit_kN": 48.8,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2300,
    "weight_g": 5230,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23934EMKD1 identifies a 170×230×45 mm (6.693 × 9.055 × 1.772 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 170 mm (two-digit code ×5, with the 00–03 exception table), and 230 mm OD / 45 mm width follow the general plan. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. The 30.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 45 mm-wide ring seats fully on both sides. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 23934EMKD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 170 mm bore 23934EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 23934EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 170×230 mm envelope is identical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 468 kN rating no longer applies.",
      "Never substitute 23934EMKD1 by envelope alone: the 723 kN C0 and 48.8 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 170 mm bearing, and drive-up procedures differ.",
      "The 468/723 kN ratings, 48.8 kN Pu and 5230 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23934EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23934EMKD1?",
        "a": "23934EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 170 mm bore, 230 mm OD and 45 mm width (6.693 × 9.055 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 468 kN, C0 723 kN, Pu 48.8 kN, grease limiting speed 1,800 r/min, oil 2,300 r/min, mass about 5230 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23934EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23934EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23934EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23934EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23934EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23934EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 468 kN C / 723 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23934EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23934EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23934emkd1",
      "＊23934emkd1",
      "23934EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23034EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23034EAD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 260,
    "B_mm": 67,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 914,
    "static_load_kN": 1240,
    "fatigue_load_limit_kN": 68.8,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2200,
    "weight_g": 12700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23034EAD1 identifies a 170×260×67 mm (6.693 × 10.236 × 2.638 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (cylindrical), lubrication feature (D1); 23034EAD1 is assembled exactly in that order. The cylindrical bore fits a machined 170 mm shaft seat directly; the same envelope in 23034EAKD1 (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. The 45.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 67 mm-wide ring seats fully on both sides. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 170 mm set.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 170 mm bore 23034EAD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 23034EAD1 by envelope alone: the 1240 kN C0 and 68.8 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,700 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Oil relubrication toward 2,200 r/min needs drain and level design; flooding the 67 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Do not confuse EA and EM at the same number: 23034EAD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 170×260 mm envelope is identical.",
      "The 914/1240 kN ratings, 68.8 kN Pu and 12700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23034EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23034EAD1?",
        "a": "23034EAD1 is an NTN double-row spherical roller bearing to ISO 15: 170 mm bore, 260 mm OD and 67 mm width (6.693 × 10.236 × 2.638 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 914 kN, C0 1240 kN, Pu 68.8 kN, grease limiting speed 1,700 r/min, oil 2,200 r/min, mass about 12700 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23034EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23034EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23034EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23034EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23034EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23034EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 914 kN C / 1240 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23034EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23034EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23034ead1",
      "＊23034ead1",
      "23034EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23034EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23034EAKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 260,
    "B_mm": 67,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 914,
    "static_load_kN": 1240,
    "fatigue_load_limit_kN": 68.8,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2200,
    "weight_g": 12300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 170 mm shaft, NTN supplies 23034EAKD1: sphered outer raceway, two roller rows, pressed sheet-steel window cage (EA high-capacity design), oil speed 2,200 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (K), lubrication feature (D1); 23034EAKD1 is assembled exactly in that order. The 1:12 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 170 mm bore assembly. Speed planning: 1,700 r/min grease limiting speed is the cage/kinematic ceiling and 2,200 r/min is the oil-lubricated value for the 170 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Mount 23034EAKD1 on its adapter or withdrawal sleeve on the 170 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 170 mm bore 23034EAKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 2,200 r/min needs drain and level design; flooding the 67 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23034EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Never substitute 23034EAKD1 by envelope alone: the 1240 kN C0 and 68.8 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "Do not confuse EA and EM at the same number: 23034EAKD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 170×260 mm envelope is identical.",
      "The 914/1240 kN ratings, 68.8 kN Pu and 12300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23034EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23034EAKD1?",
        "a": "23034EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 170 mm bore, 260 mm OD and 67 mm width (6.693 × 10.236 × 2.638 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 914 kN, C0 1240 kN, Pu 68.8 kN, grease limiting speed 1,700 r/min, oil 2,200 r/min, mass about 12300 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23034EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23034EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23034EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23034EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23034EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23034EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 914 kN C / 1240 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23034EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23034EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23034eakd1",
      "＊23034eakd1",
      "23034EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23034EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23034EMD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 260,
    "B_mm": 67,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 914,
    "static_load_kN": 1240,
    "fatigue_load_limit_kN": 68.8,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2200,
    "weight_g": 12800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23034EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 170 mm shaft — 914 kN basic dynamic capacity in a 12800 g, open ISO 15 envelope. Numbering ties 23034EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 170 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Suffix reading on 23034EMD1: EM identifies the high-capacity execution with a one-piece machined brass cage; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. The 45.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 67 mm-wide ring seats fully on both sides. Fillet radii on shaft and housing must clear the ring chamfers of the 67 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 170 mm bore 23034EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The cylindrical-bore 23034EMD1 and its tapered-bore counterpart 23034EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23034EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,700 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 67 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 914/1240 kN ratings, 68.8 kN Pu and 12800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23034EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23034EMD1?",
        "a": "23034EMD1 is an NTN double-row spherical roller bearing to ISO 15: 170 mm bore, 260 mm OD and 67 mm width (6.693 × 10.236 × 2.638 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 914 kN, C0 1240 kN, Pu 68.8 kN, grease limiting speed 1,700 r/min, oil 2,200 r/min, mass about 12800 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23034EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23034EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23034EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23034EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23034EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23034EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 914 kN C / 1240 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23034EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23034EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23034emd1",
      "＊23034emd1",
      "23034EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23034EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23034EMKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 260,
    "B_mm": 67,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 914,
    "static_load_kN": 1240,
    "fatigue_load_limit_kN": 68.8,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2200,
    "weight_g": 12400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23034EMKD1 denotes the 170 mm bore spherical roller bearing (914 kN C / 1240 kN C0) in the 23000 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (23000 series); the bore code resolves to 170 mm (two-digit code ×5, with the 00–03 exception table), and 260 mm OD / 67 mm width follow the general plan. Suffix reading on 23034EMKD1: EM identifies the high-capacity execution with a one-piece machined brass cage; K marks the 1:12 tapered bore; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. Speed planning: 1,700 r/min grease limiting speed is the cage/kinematic ceiling and 2,200 r/min is the oil-lubricated value for the 170 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Mount 23034EMKD1 on its adapter or withdrawal sleeve on the 170 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 170 mm bore 23034EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,700 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 67 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 170 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 67 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 914/1240 kN ratings, 68.8 kN Pu and 12400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23034EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23034EMKD1?",
        "a": "23034EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 170 mm bore, 260 mm OD and 67 mm width (6.693 × 10.236 × 2.638 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 914 kN, C0 1240 kN, Pu 68.8 kN, grease limiting speed 1,700 r/min, oil 2,200 r/min, mass about 12400 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23034EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23034EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23034EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23034EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23034EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23034EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 914 kN C / 1240 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23034EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23034EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23034emkd1",
      "＊23034emkd1",
      "23034EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24034EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24034EMD1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 260,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1100,
    "static_load_kN": 1600,
    "fatigue_load_limit_kN": 66.3,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1900,
    "weight_g": 17200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 24034EMD1 identifies a 170×260×90 mm (6.693 × 10.236 × 3.543 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 170 mm bore; the 90 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Pu 66.3 kN is the catalogue fatigue load limit for 24034EMD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Equivalent-load planning keeps a radial plus moderate axial combination on 24034EMD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Never mount 24034EMD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 260 mm race.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 170 mm bore 24034EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,500 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Oil relubrication toward 1,900 r/min needs drain and level design; flooding the 90 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,500 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24034EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 1100/1600 kN ratings, 66.3 kN Pu and 17200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24034EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24034EMD1?",
        "a": "24034EMD1 is an NTN double-row spherical roller bearing to ISO 15: 170 mm bore, 260 mm OD and 90 mm width (6.693 × 10.236 × 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1100 kN, C0 1600 kN, Pu 66.3 kN, grease limiting speed 1,500 r/min, oil 1,900 r/min, mass about 17200 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24034EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24034EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24034EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24034EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24034EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24034EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1100 kN C / 1600 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24034EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24034EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24034emd1",
      "＊24034emd1",
      "24034EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24034EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24034EMK30D1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 260,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1100,
    "static_load_kN": 1600,
    "fatigue_load_limit_kN": 66.3,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1900,
    "weight_g": 16900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 24034EMK30D1 with a 1:30 tapered bore (K30) and D1 outer-ring annular oil groove with holes: 170 mm bore, 260 mm OD, 90 mm width, rated 1,500 r/min on grease. Numbering ties 24034EMK30D1 to its envelope and execution: same-number EA versus EM or plain variants share the 170 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. The 45.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 90 mm-wide ring seats fully on both sides. Fillet radii on shaft and housing must clear the ring chamfers of the 90 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 170 mm bore 24034EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1100 kN rating no longer applies.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24034EMK30D1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 170 mm bearing, and drive-up procedures differ.",
      "Never substitute 24034EMK30D1 by envelope alone: the 1600 kN C0 and 66.3 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 1100/1600 kN ratings, 66.3 kN Pu and 16900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24034EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24034EMK30D1?",
        "a": "24034EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 170 mm bore, 260 mm OD and 90 mm width (6.693 × 10.236 × 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1100 kN, C0 1600 kN, Pu 66.3 kN, grease limiting speed 1,500 r/min, oil 1,900 r/min, mass about 16900 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 24034EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 170 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24034EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24034EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24034EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24034EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24034EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1100 kN C / 1600 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24034EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24034EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24034emk30d1",
      "＊24034emk30d1",
      "24034EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23134EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23134EAD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 280,
    "B_mm": 88,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1270,
    "static_load_kN": 1700,
    "fatigue_load_limit_kN": 77.3,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1800,
    "weight_g": 21500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23134EAD1 belongs to the 23100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (23100 series); the bore code resolves to 170 mm (two-digit code ×5, with the 00–03 exception table), and 280 mm OD / 88 mm width follow the general plan. Open by design, 23134EAD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Selection: the C0/C ratio of 1.34 (1700/1270 kN) reflects the heavy static and shock proportioning of 23134EAD1; size the equivalent load at the required L10 with shock factor for the application. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 23134EAD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 170 mm bore 23134EAD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The cylindrical-bore 23134EAD1 and its tapered-bore counterpart 23134EAKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23134EAD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Do not confuse EA and EM at the same number: 23134EAD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 170×280 mm envelope is identical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1270 kN rating no longer applies.",
      "The 1270/1700 kN ratings, 77.3 kN Pu and 21500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23134EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23134EAD1?",
        "a": "23134EAD1 is an NTN double-row spherical roller bearing to ISO 15: 170 mm bore, 280 mm OD and 88 mm width (6.693 × 11.024 × 3.465 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1270 kN, C0 1700 kN, Pu 77.3 kN, grease limiting speed 1,400 r/min, oil 1,800 r/min, mass about 21500 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23134EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23134EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23134EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23134EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23134EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23134EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1270 kN C / 1700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23134EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23134EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23134ead1",
      "＊23134ead1",
      "23134EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23134EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23134EAKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 280,
    "B_mm": 88,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1270,
    "static_load_kN": 1700,
    "fatigue_load_limit_kN": 77.3,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1800,
    "weight_g": 20900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23134EAKD1 belongs to the 23100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (23100 series); the bore code resolves to 170 mm (two-digit code ×5, with the 00–03 exception table), and 280 mm OD / 88 mm width follow the general plan. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Speed planning: 1,400 r/min grease limiting speed is the cage/kinematic ceiling and 1,800 r/min is the oil-lubricated value for the 170 mm bore; vibrating screens rarely approach either and are load/cage limited instead. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 23134EAKD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 170 mm bore 23134EAKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 23134EAKD1 by envelope alone: the 1700 kN C0 and 77.3 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "Oil relubrication toward 1,800 r/min needs drain and level design; flooding the 88 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1270 kN rating no longer applies.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 170 mm bearing, and drive-up procedures differ.",
      "The 1270/1700 kN ratings, 77.3 kN Pu and 20900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23134EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23134EAKD1?",
        "a": "23134EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 170 mm bore, 280 mm OD and 88 mm width (6.693 × 11.024 × 3.465 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1270 kN, C0 1700 kN, Pu 77.3 kN, grease limiting speed 1,400 r/min, oil 1,800 r/min, mass about 20900 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23134EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23134EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23134EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23134EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23134EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23134EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1270 kN C / 1700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23134EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23134EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23134eakd1",
      "＊23134eakd1",
      "23134EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23134EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23134EMD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 280,
    "B_mm": 88,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1270,
    "static_load_kN": 1700,
    "fatigue_load_limit_kN": 77.3,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1800,
    "weight_g": 21600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 170 mm shaft, NTN supplies 23134EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,800 r/min. Digit by digit the code reads as spherical-roller dimension series plus 170 mm bore; the 88 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Open by design, 23134EMD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Speed planning: 1,400 r/min grease limiting speed is the cage/kinematic ceiling and 1,800 r/min is the oil-lubricated value for the 170 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Fillet radii on shaft and housing must clear the ring chamfers of the 88 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 170 mm bore 23134EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,400 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Never substitute 23134EMD1 by envelope alone: the 1700 kN C0 and 77.3 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 88 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1270 kN rating no longer applies.",
      "The 1270/1700 kN ratings, 77.3 kN Pu and 21600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23134EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23134EMD1?",
        "a": "23134EMD1 is an NTN double-row spherical roller bearing to ISO 15: 170 mm bore, 280 mm OD and 88 mm width (6.693 × 11.024 × 3.465 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1270 kN, C0 1700 kN, Pu 77.3 kN, grease limiting speed 1,400 r/min, oil 1,800 r/min, mass about 21600 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23134EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23134EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23134EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23134EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23134EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23134EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1270 kN C / 1700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23134EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23134EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23134emd1",
      "＊23134emd1",
      "23134EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23134EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23134EMKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 280,
    "B_mm": 88,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1270,
    "static_load_kN": 1700,
    "fatigue_load_limit_kN": 77.3,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1800,
    "weight_g": 20900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23134EMKD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 170 mm shaft — 1270 kN basic dynamic capacity in a 20900 g, open ISO 15 envelope. Reading the full code: the number gives the 170×280 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. Pu 77.3 kN is the catalogue fatigue load limit for 23134EMKD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Selection: the C0/C ratio of 1.34 (1700/1270 kN) reflects the heavy static and shock proportioning of 23134EMKD1; size the equivalent load at the required L10 with shock factor for the application. Fillet radii on shaft and housing must clear the ring chamfers of the 88 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 170 mm bore 23134EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 23134EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 170×280 mm envelope is identical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23134EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 170 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23134EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 1270/1700 kN ratings, 77.3 kN Pu and 20900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23134EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23134EMKD1?",
        "a": "23134EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 170 mm bore, 280 mm OD and 88 mm width (6.693 × 11.024 × 3.465 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1270 kN, C0 1700 kN, Pu 77.3 kN, grease limiting speed 1,400 r/min, oil 1,800 r/min, mass about 20900 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23134EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23134EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23134EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23134EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23134EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23134EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1270 kN C / 1700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23134EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23134EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23134emkd1",
      "＊23134emkd1",
      "23134EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24134EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24134EMD1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 280,
    "B_mm": 109,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1410,
    "static_load_kN": 1990,
    "fatigue_load_limit_kN": 74.4,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1700,
    "weight_g": 26700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24134EMD1 belongs to the 24100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 24134EMD1 is assembled exactly in that order. The 55.0 mm radial section over the 170 mm bore carries two roller rows; capacity per millimetre of bore is about 8.3 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Selection: the C0/C ratio of 1.41 (1990/1410 kN) reflects the heavy static and shock proportioning of 24134EMD1; size the equivalent load at the required L10 with shock factor for the application. Never mount 24134EMD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 280 mm race.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 170 mm bore 24134EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 24134EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 170×280 mm envelope is identical.",
      "Do not confuse EA and EM at the same number: 24134EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 170×280 mm envelope is identical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 109 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The cylindrical-bore 24134EMD1 and its tapered-bore counterpart 24134EMK30D1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 1410/1990 kN ratings, 74.4 kN Pu and 26700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24134EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24134EMD1?",
        "a": "24134EMD1 is an NTN double-row spherical roller bearing to ISO 15: 170 mm bore, 280 mm OD and 109 mm width (6.693 × 11.024 × 4.291 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1410 kN, C0 1990 kN, Pu 74.4 kN, grease limiting speed 1,400 r/min, oil 1,700 r/min, mass about 26700 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24134EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24134EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24134EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24134EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24134EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24134EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1410 kN C / 1990 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24134EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24134EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24134emd1",
      "＊24134emd1",
      "24134EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24134EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24134EMK30D1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 280,
    "B_mm": 109,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1410,
    "static_load_kN": 1990,
    "fatigue_load_limit_kN": 74.4,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1700,
    "weight_g": 26300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 24134EMK30D1 denotes the 170 mm bore spherical roller bearing (1410 kN C / 1990 kN C0) in the 24100 series, the self-aligning choice for heavy combined load. Digit by digit the code reads as spherical-roller dimension series plus 170 mm bore; the 109 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Two symmetric roller rows share the load: C 1410 kN, C0 1990 kN (C0/C ≈ 1.41), with useful axial capacity in either direction alongside the dominant radial load. 170 mm bore is 6.693 in and 280 mm OD is 11.024 in; the ISO 15 envelope swaps between brands, but the 1410/1990 kN ratings and cage design are NTN 2203E values. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 170 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 170 mm bore 24134EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 24134EMK30D1 by envelope alone: the 1990 kN C0 and 74.4 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24134EMK30D1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 24134EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 170 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 1410/1990 kN ratings, 74.4 kN Pu and 26300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24134EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24134EMK30D1?",
        "a": "24134EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 170 mm bore, 280 mm OD and 109 mm width (6.693 × 11.024 × 4.291 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1410 kN, C0 1990 kN, Pu 74.4 kN, grease limiting speed 1,400 r/min, oil 1,700 r/min, mass about 26300 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24134EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 170 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24134EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24134EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24134EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24134EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24134EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1410 kN C / 1990 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24134EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24134EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24134emk30d1",
      "＊24134emk30d1",
      "24134EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22234EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22234EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1400,
    "static_load_kN": 1610,
    "fatigue_load_limit_kN": 94.7,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 2000,
    "weight_g": 28300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22234EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 170 mm shaft — 1400 kN basic dynamic capacity in a 28300 g, open ISO 15 envelope. Reading the full code: the number gives the 170×310 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. The 70.0 mm radial section over the 170 mm bore carries two roller rows; capacity per millimetre of bore is about 8.2 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. 170 mm bore is 6.693 in and 310 mm OD is 12.205 in; the ISO 15 envelope swaps between brands, but the 1400/1610 kN ratings and cage design are NTN 2203E values. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 170 mm set.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 170 mm bore 22234EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The cylindrical-bore 22234EMD1 and its tapered-bore counterpart 22234EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The cylindrical-bore 22234EMD1 and its tapered-bore counterpart 22234EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 170 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The cylindrical-bore 22234EMD1 and its tapered-bore counterpart 22234EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 1400/1610 kN ratings, 94.7 kN Pu and 28300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22234EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22234EMD1?",
        "a": "22234EMD1 is an NTN double-row spherical roller bearing to ISO 15: 170 mm bore, 310 mm OD and 86 mm width (6.693 × 12.205 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1400 kN, C0 1610 kN, Pu 94.7 kN, grease limiting speed 1,600 r/min, oil 2,000 r/min, mass about 28300 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22234EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22234EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22234EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22234EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22234EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22234EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1400 kN C / 1610 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22234EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22234EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22234emd1",
      "＊22234emd1",
      "22234EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22234EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22234EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1400,
    "static_load_kN": 1610,
    "fatigue_load_limit_kN": 94.7,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 2000,
    "weight_g": 27700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22234EMKD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 170 mm shaft — 1400 kN basic dynamic capacity in a 27700 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 170 mm bore; the 86 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Two symmetric roller rows share the load: C 1400 kN, C0 1610 kN (C0/C ≈ 1.15), with useful axial capacity in either direction alongside the dominant radial load. Selection: the C0/C ratio of 1.15 (1610/1400 kN) reflects the heavy static and shock proportioning of 22234EMKD1; size the equivalent load at the required L10 with shock factor for the application. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22234EMKD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 170 mm bore 22234EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22234EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Oil relubrication toward 2,000 r/min needs drain and level design; flooding the 86 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 86 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 170 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 1400/1610 kN ratings, 94.7 kN Pu and 27700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22234EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22234EMKD1?",
        "a": "22234EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 170 mm bore, 310 mm OD and 86 mm width (6.693 × 12.205 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1400 kN, C0 1610 kN, Pu 94.7 kN, grease limiting speed 1,600 r/min, oil 2,000 r/min, mass about 27700 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22234EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22234EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22234EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22234EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22234EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22234EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1400 kN C / 1610 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22234EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22234EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22234emkd1",
      "＊22234emkd1",
      "22234EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23234EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23234EMD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 110,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1700,
    "static_load_kN": 2070,
    "fatigue_load_limit_kN": 94.6,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1700,
    "weight_g": 35800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23234EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 170 mm shaft — 1700 kN basic dynamic capacity in a 35800 g, open ISO 15 envelope. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 23234EMD1 is assembled exactly in that order. Pu 94.6 kN is the catalogue fatigue load limit for 23234EMD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Pu 94.6 kN against C0 2070 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23234EMD1 moves with cleanliness far more than with small C variations. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 170 mm set.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 170 mm bore 23234EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 23234EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 170×310 mm envelope is identical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23234EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 170 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23234EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 1700/2070 kN ratings, 94.6 kN Pu and 35800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23234EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23234EMD1?",
        "a": "23234EMD1 is an NTN double-row spherical roller bearing to ISO 15: 170 mm bore, 310 mm OD and 110 mm width (6.693 × 12.205 × 4.331 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1700 kN, C0 2070 kN, Pu 94.6 kN, grease limiting speed 1,300 r/min, oil 1,700 r/min, mass about 35800 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23234EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23234EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23234EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23234EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23234EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23234EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1700 kN C / 2070 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23234EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23234EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23234emd1",
      "＊23234emd1",
      "23234EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23234EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23234EMKD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 110,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1700,
    "static_load_kN": 2070,
    "fatigue_load_limit_kN": 94.6,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1700,
    "weight_g": 34800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23234EMKD1 identifies a 170×310×110 mm (6.693 × 12.205 × 4.331 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Numbering ties 23234EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 170 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Open by design, 23234EMKD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Selection: the C0/C ratio of 1.22 (2070/1700 kN) reflects the heavy static and shock proportioning of 23234EMKD1; size the equivalent load at the required L10 with shock factor for the application. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 170 mm bore 23234EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 110 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Oil relubrication toward 1,700 r/min needs drain and level design; flooding the 110 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23234EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1700 kN rating no longer applies.",
      "The 1700/2070 kN ratings, 94.6 kN Pu and 34800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23234EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23234EMKD1?",
        "a": "23234EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 170 mm bore, 310 mm OD and 110 mm width (6.693 × 12.205 × 4.331 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1700 kN, C0 2070 kN, Pu 94.6 kN, grease limiting speed 1,300 r/min, oil 1,700 r/min, mass about 34800 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23234EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23234EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23234EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23234EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23234EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23234EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1700 kN C / 2070 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23234EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23234EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23234emkd1",
      "＊23234emkd1",
      "23234EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22334EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22334EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 360,
    "B_mm": 120,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2200,
    "static_load_kN": 2630,
    "fatigue_load_limit_kN": 121,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1500,
    "weight_g": 60300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22334EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 170 mm bore, 360 mm OD, 120 mm width, rated 1,200 r/min on grease. Numbering ties 22334EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 170 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Open by design, 22334EMD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Equivalent-load planning keeps a radial plus moderate axial combination on 22334EMD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 170 mm bore 22334EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,200 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 170 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Oil relubrication toward 1,500 r/min needs drain and level design; flooding the 120 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 2200 kN rating no longer applies.",
      "The 2200/2630 kN ratings, 121 kN Pu and 60300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22334EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22334EMD1?",
        "a": "22334EMD1 is an NTN double-row spherical roller bearing to ISO 15: 170 mm bore, 360 mm OD and 120 mm width (6.693 × 14.173 × 4.724 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2200 kN, C0 2630 kN, Pu 121 kN, grease limiting speed 1,200 r/min, oil 1,500 r/min, mass about 60300 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22334EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22334EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22334EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22334EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22334EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22334EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2200 kN C / 2630 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22334EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22334EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22334emd1",
      "＊22334emd1",
      "22334EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22334EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22334EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 360,
    "B_mm": 120,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2200,
    "static_load_kN": 2630,
    "fatigue_load_limit_kN": 121,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1500,
    "weight_g": 59100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22334EMKD1 identifies a 170×360×120 mm (6.693 × 14.173 × 4.724 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Reading the full code: the number gives the 170×360 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. Grease/oil ratio: the 1,200 r/min limiting value is .80 of the 1,500 r/min oil value; heavy 120 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 170 mm bore 22334EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 170 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,200 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 120 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 22334EMKD1 by envelope alone: the 2630 kN C0 and 121 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 2200/2630 kN ratings, 121 kN Pu and 59100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22334EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22334EMKD1?",
        "a": "22334EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 170 mm bore, 360 mm OD and 120 mm width (6.693 × 14.173 × 4.724 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2200 kN, C0 2630 kN, Pu 121 kN, grease limiting speed 1,200 r/min, oil 1,500 r/min, mass about 59100 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22334EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22334EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22334EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22334EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22334EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22334EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2200 kN C / 2630 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22334EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22334EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22334emkd1",
      "＊22334emkd1",
      "22334EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23936EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23936EMD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 250,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 573,
    "static_load_kN": 869,
    "fatigue_load_limit_kN": 57.2,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2100,
    "weight_g": 7790,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23936EMD1 belongs to the 23900 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 180 mm (two-digit code ×5, with the 00–03 exception table), and 250 mm OD / 52 mm width follow the general plan. Suffix reading on 23936EMD1: EM identifies the high-capacity execution with a one-piece machined brass cage; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. 180 mm bore is 7.087 in and 250 mm OD is 9.843 in; the ISO 15 envelope swaps between brands, but the 573/869 kN ratings and cage design are NTN 2203E values. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 180 mm set.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 180 mm bore 23936EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23936EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The cylindrical-bore 23936EMD1 and its tapered-bore counterpart 23936EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Do not confuse EA and EM at the same number: 23936EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 180×250 mm envelope is identical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 52 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 573/869 kN ratings, 57.2 kN Pu and 7790 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23936EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23936EMD1?",
        "a": "23936EMD1 is an NTN double-row spherical roller bearing to ISO 15: 180 mm bore, 250 mm OD and 52 mm width (7.087 × 9.843 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 573 kN, C0 869 kN, Pu 57.2 kN, grease limiting speed 1,700 r/min, oil 2,100 r/min, mass about 7790 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23936EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23936EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23936EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23936EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23936EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23936EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 573 kN C / 869 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23936EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23936EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23936emd1",
      "＊23936emd1",
      "23936EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23936EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23936EMKD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 250,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 573,
    "static_load_kN": 869,
    "fatigue_load_limit_kN": 57.2,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2100,
    "weight_g": 7560,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23936EMKD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 180 mm shaft — 573 kN basic dynamic capacity in a 7560 g, open ISO 15 envelope. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 180 mm (two-digit code ×5, with the 00–03 exception table), and 250 mm OD / 52 mm width follow the general plan. NTN prints two speeds for 23936EMKD1: 1,700 r/min grease and 2,100 r/min oil — the gap of 400 r/min reflects oil cooling of the heavy roller set. Equivalent-load planning keeps a radial plus moderate axial combination on 23936EMKD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Never mount 23936EMKD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 250 mm race.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 180 mm bore 23936EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23936EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 180 mm bearing, and drive-up procedures differ.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23936EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Oil relubrication toward 2,100 r/min needs drain and level design; flooding the 52 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 573/869 kN ratings, 57.2 kN Pu and 7560 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23936EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23936EMKD1?",
        "a": "23936EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 180 mm bore, 250 mm OD and 52 mm width (7.087 × 9.843 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 573 kN, C0 869 kN, Pu 57.2 kN, grease limiting speed 1,700 r/min, oil 2,100 r/min, mass about 7560 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23936EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23936EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23936EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23936EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23936EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23936EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 573 kN C / 869 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23936EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23936EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23936emkd1",
      "＊23936emkd1",
      "23936EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23036EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23036EAD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 280,
    "B_mm": 74,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1080,
    "static_load_kN": 1450,
    "fatigue_load_limit_kN": 78.6,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 2000,
    "weight_g": 16800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23036EAD1 identifies a 180×280×74 mm (7.087 × 11.024 × 2.913 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 180 mm bore; the 74 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The 50.0 mm radial section over the 180 mm bore carries two roller rows; capacity per millimetre of bore is about 6.0 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. The 50.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 74 mm-wide ring seats fully on both sides. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 180 mm bore 23036EAD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 180 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23036EAD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1080 kN rating no longer applies.",
      "The cylindrical-bore 23036EAD1 and its tapered-bore counterpart 23036EAKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 1080/1450 kN ratings, 78.6 kN Pu and 16800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23036EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23036EAD1?",
        "a": "23036EAD1 is an NTN double-row spherical roller bearing to ISO 15: 180 mm bore, 280 mm OD and 74 mm width (7.087 × 11.024 × 2.913 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1080 kN, C0 1450 kN, Pu 78.6 kN, grease limiting speed 1,600 r/min, oil 2,000 r/min, mass about 16800 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23036EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23036EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23036EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23036EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23036EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23036EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1080 kN C / 1450 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23036EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23036EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23036ead1",
      "＊23036ead1",
      "23036EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23036EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23036EAKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 280,
    "B_mm": 74,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1080,
    "static_load_kN": 1450,
    "fatigue_load_limit_kN": 78.6,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 2000,
    "weight_g": 16300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 180 mm shaft, NTN supplies 23036EAKD1: sphered outer raceway, two roller rows, pressed sheet-steel window cage (EA high-capacity design), oil speed 2,000 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (K), lubrication feature (D1); 23036EAKD1 is assembled exactly in that order. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Selection: the C0/C ratio of 1.34 (1450/1080 kN) reflects the heavy static and shock proportioning of 23036EAKD1; size the equivalent load at the required L10 with shock factor for the application. Mount 23036EAKD1 on its adapter or withdrawal sleeve on the 180 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 180 mm bore 23036EAKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,600 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Never substitute 23036EAKD1 by envelope alone: the 1450 kN C0 and 78.6 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23036EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 180 mm bearing, and drive-up procedures differ.",
      "The 1080/1450 kN ratings, 78.6 kN Pu and 16300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23036EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23036EAKD1?",
        "a": "23036EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 180 mm bore, 280 mm OD and 74 mm width (7.087 × 11.024 × 2.913 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1080 kN, C0 1450 kN, Pu 78.6 kN, grease limiting speed 1,600 r/min, oil 2,000 r/min, mass about 16300 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23036EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23036EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23036EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23036EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23036EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23036EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1080 kN C / 1450 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23036EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23036EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23036eakd1",
      "＊23036eakd1",
      "23036EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23036EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23036EMD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 280,
    "B_mm": 74,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1080,
    "static_load_kN": 1450,
    "fatigue_load_limit_kN": 78.6,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 2000,
    "weight_g": 16900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23036EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 180 mm shaft — 1080 kN basic dynamic capacity in a 16900 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 180 mm bore; the 74 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. At 1080 kN C and 16900 g mass the 23000 series part is built for shock and vibration; the 74 mm-wide ring needs square abutments to keep both rows equally loaded. Grease/oil ratio: the 1,600 r/min limiting value is .80 of the 2,000 r/min oil value; heavy 74 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Fit the cylindrical-bore 23036EMD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 180 mm bore 23036EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 2,000 r/min needs drain and level design; flooding the 74 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Never substitute 23036EMD1 by envelope alone: the 1450 kN C0 and 78.6 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The cylindrical-bore 23036EMD1 and its tapered-bore counterpart 23036EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,600 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1080/1450 kN ratings, 78.6 kN Pu and 16900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23036EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23036EMD1?",
        "a": "23036EMD1 is an NTN double-row spherical roller bearing to ISO 15: 180 mm bore, 280 mm OD and 74 mm width (7.087 × 11.024 × 2.913 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1080 kN, C0 1450 kN, Pu 78.6 kN, grease limiting speed 1,600 r/min, oil 2,000 r/min, mass about 16900 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23036EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23036EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23036EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23036EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23036EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23036EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1080 kN C / 1450 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23036EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23036EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23036emd1",
      "＊23036emd1",
      "23036EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23036EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23036EMKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 280,
    "B_mm": 74,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1080,
    "static_load_kN": 1450,
    "fatigue_load_limit_kN": 78.6,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 2000,
    "weight_g": 16400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23036EMKD1 denotes the 180 mm bore spherical roller bearing (1080 kN C / 1450 kN C0) in the 23000 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (23000 series); the bore code resolves to 180 mm (two-digit code ×5, with the 00–03 exception table), and 280 mm OD / 74 mm width follow the general plan. Pu 78.6 kN is the catalogue fatigue load limit for 23036EMKD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. The 50.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 74 mm-wide ring seats fully on both sides. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 180 mm set.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 180 mm bore 23036EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 180 mm bearing, and drive-up procedures differ.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 180 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23036EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23036EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 1080/1450 kN ratings, 78.6 kN Pu and 16400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23036EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23036EMKD1?",
        "a": "23036EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 180 mm bore, 280 mm OD and 74 mm width (7.087 × 11.024 × 2.913 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1080 kN, C0 1450 kN, Pu 78.6 kN, grease limiting speed 1,600 r/min, oil 2,000 r/min, mass about 16400 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23036EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23036EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23036EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23036EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23036EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23036EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1080 kN C / 1450 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23036EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23036EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23036emkd1",
      "＊23036emkd1",
      "23036EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24036EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24036EMD1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 280,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1310,
    "static_load_kN": 1880,
    "fatigue_load_limit_kN": 76,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1800,
    "weight_g": 22800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 24036EMD1 identifies a 180×280×100 mm (7.087 × 11.024 × 3.937 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 24036EMD1 is assembled exactly in that order. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. 180 mm bore is 7.087 in and 280 mm OD is 11.024 in; the ISO 15 envelope swaps between brands, but the 1310/1880 kN ratings and cage design are NTN 2203E values. Fillet radii on shaft and housing must clear the ring chamfers of the 100 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 180 mm bore 24036EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 24036EMD1 by envelope alone: the 1880 kN C0 and 76 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Do not confuse EA and EM at the same number: 24036EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 180×280 mm envelope is identical.",
      "The cylindrical-bore 24036EMD1 and its tapered-bore counterpart 24036EMK30D1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 180 mm bearing, and drive-up procedures differ.",
      "The 1310/1880 kN ratings, 76 kN Pu and 22800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24036EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24036EMD1?",
        "a": "24036EMD1 is an NTN double-row spherical roller bearing to ISO 15: 180 mm bore, 280 mm OD and 100 mm width (7.087 × 11.024 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1310 kN, C0 1880 kN, Pu 76 kN, grease limiting speed 1,400 r/min, oil 1,800 r/min, mass about 22800 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24036EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24036EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24036EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24036EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24036EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24036EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1310 kN C / 1880 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24036EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24036EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24036emd1",
      "＊24036emd1",
      "24036EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24036EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24036EMK30D1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 280,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1310,
    "static_load_kN": 1880,
    "fatigue_load_limit_kN": 76,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1800,
    "weight_g": 22400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24036EMK30D1 belongs to the 24000 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. Reading the full code: the number gives the 180×280 mm envelope, EM names the cage/capacity execution, K30 marks the 1:30 tapered bore for sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. 180 mm bore is 7.087 in and 280 mm OD is 11.024 in; the ISO 15 envelope swaps between brands, but the 1310/1880 kN ratings and cage design are NTN 2203E values. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 180 mm set.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 180 mm bore 24036EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 24036EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,400 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Do not confuse EA and EM at the same number: 24036EMK30D1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 180×280 mm envelope is identical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 180 mm bearing, and drive-up procedures differ.",
      "The 1310/1880 kN ratings, 76 kN Pu and 22400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24036EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24036EMK30D1?",
        "a": "24036EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 180 mm bore, 280 mm OD and 100 mm width (7.087 × 11.024 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1310 kN, C0 1880 kN, Pu 76 kN, grease limiting speed 1,400 r/min, oil 1,800 r/min, mass about 22400 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 24036EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 180 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24036EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24036EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24036EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24036EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24036EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1310 kN C / 1880 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24036EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24036EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24036emk30d1",
      "＊24036emk30d1",
      "24036EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23136EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23136EAD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 300,
    "B_mm": 96,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1490,
    "static_load_kN": 1960,
    "fatigue_load_limit_kN": 88.7,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1700,
    "weight_g": 27200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23136EAD1 belongs to the 23100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (cylindrical), lubrication feature (D1); 23136EAD1 is assembled exactly in that order. Pu 88.7 kN is the catalogue fatigue load limit for 23136EAD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Selection: the C0/C ratio of 1.32 (1960/1490 kN) reflects the heavy static and shock proportioning of 23136EAD1; size the equivalent load at the required L10 with shock factor for the application. Never mount 23136EAD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 300 mm race.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 180 mm bore 23136EAD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1490 kN rating no longer applies.",
      "Oil relubrication toward 1,700 r/min needs drain and level design; flooding the 96 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,300 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23136EAD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 1490/1960 kN ratings, 88.7 kN Pu and 27200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23136EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23136EAD1?",
        "a": "23136EAD1 is an NTN double-row spherical roller bearing to ISO 15: 180 mm bore, 300 mm OD and 96 mm width (7.087 × 11.811 × 3.78 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1490 kN, C0 1960 kN, Pu 88.7 kN, grease limiting speed 1,300 r/min, oil 1,700 r/min, mass about 27200 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23136EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23136EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23136EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23136EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23136EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23136EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1490 kN C / 1960 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23136EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23136EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23136ead1",
      "＊23136ead1",
      "23136EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23136EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23136EAKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 300,
    "B_mm": 96,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1490,
    "static_load_kN": 1960,
    "fatigue_load_limit_kN": 88.7,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1700,
    "weight_g": 26400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23136EAKD1 belongs to the 23100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (23100 series); the bore code resolves to 180 mm (two-digit code ×5, with the 00–03 exception table), and 300 mm OD / 96 mm width follow the general plan. Two symmetric roller rows share the load: C 1490 kN, C0 1960 kN (C0/C ≈ 1.32), with useful axial capacity in either direction alongside the dominant radial load. The 60.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 96 mm-wide ring seats fully on both sides. Fillet radii on shaft and housing must clear the ring chamfers of the 96 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 180 mm bore 23136EAKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 23136EAKD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 180×300 mm envelope is identical.",
      "Do not confuse EA and EM at the same number: 23136EAKD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 180×300 mm envelope is identical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23136EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 180 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 1490/1960 kN ratings, 88.7 kN Pu and 26400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23136EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23136EAKD1?",
        "a": "23136EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 180 mm bore, 300 mm OD and 96 mm width (7.087 × 11.811 × 3.78 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1490 kN, C0 1960 kN, Pu 88.7 kN, grease limiting speed 1,300 r/min, oil 1,700 r/min, mass about 26400 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23136EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23136EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23136EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23136EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23136EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23136EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1490 kN C / 1960 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23136EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23136EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23136eakd1",
      "＊23136eakd1",
      "23136EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23136EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23136EMD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 300,
    "B_mm": 96,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1490,
    "static_load_kN": 1960,
    "fatigue_load_limit_kN": 88.7,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1700,
    "weight_g": 27400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 180 mm shaft, NTN supplies 23136EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,700 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 23136EMD1 is assembled exactly in that order. Pu 88.7 kN is the catalogue fatigue load limit for 23136EMD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. The 60.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 96 mm-wide ring seats fully on both sides. Fit the cylindrical-bore 23136EMD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 180 mm bore 23136EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 23136EMD1 by envelope alone: the 1960 kN C0 and 88.7 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 96 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Do not confuse EA and EM at the same number: 23136EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 180×300 mm envelope is identical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23136EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 1490/1960 kN ratings, 88.7 kN Pu and 27400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23136EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23136EMD1?",
        "a": "23136EMD1 is an NTN double-row spherical roller bearing to ISO 15: 180 mm bore, 300 mm OD and 96 mm width (7.087 × 11.811 × 3.78 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1490 kN, C0 1960 kN, Pu 88.7 kN, grease limiting speed 1,300 r/min, oil 1,700 r/min, mass about 27400 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23136EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23136EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23136EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23136EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23136EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23136EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1490 kN C / 1960 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23136EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23136EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23136emd1",
      "＊23136emd1",
      "23136EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23136EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23136EMKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 300,
    "B_mm": 96,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1490,
    "static_load_kN": 1960,
    "fatigue_load_limit_kN": 88.7,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1700,
    "weight_g": 26500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23136EMKD1 denotes the 180 mm bore spherical roller bearing (1490 kN C / 1960 kN C0) in the 23100 series, the self-aligning choice for heavy combined load. Reading the full code: the number gives the 180×300 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. The 60.0 mm radial section over the 180 mm bore carries two roller rows; capacity per millimetre of bore is about 8.3 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. The 60.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 96 mm-wide ring seats fully on both sides. Mount 23136EMKD1 on its adapter or withdrawal sleeve on the 180 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 180 mm bore 23136EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23136EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Do not confuse EA and EM at the same number: 23136EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 180×300 mm envelope is identical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 96 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23136EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 1490/1960 kN ratings, 88.7 kN Pu and 26500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23136EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23136EMKD1?",
        "a": "23136EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 180 mm bore, 300 mm OD and 96 mm width (7.087 × 11.811 × 3.78 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1490 kN, C0 1960 kN, Pu 88.7 kN, grease limiting speed 1,300 r/min, oil 1,700 r/min, mass about 26500 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23136EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23136EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23136EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23136EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23136EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23136EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1490 kN C / 1960 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23136EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23136EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23136emkd1",
      "＊23136emkd1",
      "23136EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24136EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24136EMD1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 300,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1660,
    "static_load_kN": 2290,
    "fatigue_load_limit_kN": 85.5,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1600,
    "weight_g": 33500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24136EMD1 belongs to the 24100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 180 mm (two-digit code ×5, with the 00–03 exception table), and 300 mm OD / 118 mm width follow the general plan. NTN prints two speeds for 24136EMD1: 1,300 r/min grease and 1,600 r/min oil — the gap of 300 r/min reflects oil cooling of the heavy roller set. Equivalent-load planning keeps a radial plus moderate axial combination on 24136EMD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Fillet radii on shaft and housing must clear the ring chamfers of the 118 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 180 mm bore 24136EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The cylindrical-bore 24136EMD1 and its tapered-bore counterpart 24136EMK30D1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24136EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Do not confuse EA and EM at the same number: 24136EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 180×300 mm envelope is identical.",
      "Oil relubrication toward 1,600 r/min needs drain and level design; flooding the 118 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 1660/2290 kN ratings, 85.5 kN Pu and 33500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24136EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24136EMD1?",
        "a": "24136EMD1 is an NTN double-row spherical roller bearing to ISO 15: 180 mm bore, 300 mm OD and 118 mm width (7.087 × 11.811 × 4.646 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1660 kN, C0 2290 kN, Pu 85.5 kN, grease limiting speed 1,300 r/min, oil 1,600 r/min, mass about 33500 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24136EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24136EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24136EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24136EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24136EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24136EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1660 kN C / 2290 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24136EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24136EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24136emd1",
      "＊24136emd1",
      "24136EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24136EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24136EMK30D1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 300,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1660,
    "static_load_kN": 2290,
    "fatigue_load_limit_kN": 85.5,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1600,
    "weight_g": 33000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 24136EMK30D1 identifies a 180×300×118 mm (7.087 × 11.811 × 4.646 in) spherical roller bearing, 1:30 tapered bore (K30), to the ISO 15 boundary plan. Numbering ties 24136EMK30D1 to its envelope and execution: same-number EA versus EM or plain variants share the 180 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. At 1660 kN C and 33000 g mass the 24100 series part is built for shock and vibration; the 118 mm-wide ring needs square abutments to keep both rows equally loaded. Pu 85.5 kN against C0 2290 kN anchors the contamination derating; for dirty mining duty the adjusted life of 24136EMK30D1 moves with cleanliness far more than with small C variations. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 24136EMK30D1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 180 mm bore 24136EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 24136EMK30D1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 180×300 mm envelope is identical.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 24136EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Oil relubrication toward 1,600 r/min needs drain and level design; flooding the 118 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,300 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1660/2290 kN ratings, 85.5 kN Pu and 33000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24136EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24136EMK30D1?",
        "a": "24136EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 180 mm bore, 300 mm OD and 118 mm width (7.087 × 11.811 × 4.646 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1660 kN, C0 2290 kN, Pu 85.5 kN, grease limiting speed 1,300 r/min, oil 1,600 r/min, mass about 33000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24136EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 180 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24136EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24136EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24136EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24136EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24136EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1660 kN C / 2290 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24136EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24136EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24136emk30d1",
      "＊24136emk30d1",
      "24136EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22236EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22236EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1450,
    "static_load_kN": 1660,
    "fatigue_load_limit_kN": 101,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1900,
    "weight_g": 29300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22236EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 180 mm shaft — 1450 kN basic dynamic capacity in a 29300 g, open ISO 15 envelope. Numbering ties 22236EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 180 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. NTN prints two speeds for 22236EMD1: 1,500 r/min grease and 1,900 r/min oil — the gap of 400 r/min reflects oil cooling of the heavy roller set. Catalogue mass 29300 g (29.30 kg) for the 180×320×86 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 180 mm bore 22236EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 1,900 r/min needs drain and level design; flooding the 86 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 180 mm bearing, and drive-up procedures differ.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22236EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Oil relubrication toward 1,900 r/min needs drain and level design; flooding the 86 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 1450/1660 kN ratings, 101 kN Pu and 29300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22236EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22236EMD1?",
        "a": "22236EMD1 is an NTN double-row spherical roller bearing to ISO 15: 180 mm bore, 320 mm OD and 86 mm width (7.087 × 12.598 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1450 kN, C0 1660 kN, Pu 101 kN, grease limiting speed 1,500 r/min, oil 1,900 r/min, mass about 29300 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22236EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22236EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22236EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22236EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22236EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22236EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1450 kN C / 1660 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22236EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22236EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22236emd1",
      "＊22236emd1",
      "22236EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22236EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22236EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1450,
    "static_load_kN": 1660,
    "fatigue_load_limit_kN": 101,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1900,
    "weight_g": 28700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22236EMKD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 180 mm shaft — 1450 kN basic dynamic capacity in a 28700 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 180 mm bore; the 86 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. Equivalent-load planning keeps a radial plus moderate axial combination on 22236EMKD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Fillet radii on shaft and housing must clear the ring chamfers of the 86 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 180 mm bore 22236EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1450 kN rating no longer applies.",
      "Do not confuse EA and EM at the same number: 22236EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 180×320 mm envelope is identical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,500 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Never substitute 22236EMKD1 by envelope alone: the 1660 kN C0 and 101 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 1450/1660 kN ratings, 101 kN Pu and 28700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22236EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22236EMKD1?",
        "a": "22236EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 180 mm bore, 320 mm OD and 86 mm width (7.087 × 12.598 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1450 kN, C0 1660 kN, Pu 101 kN, grease limiting speed 1,500 r/min, oil 1,900 r/min, mass about 28700 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22236EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22236EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22236EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22236EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22236EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22236EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1450 kN C / 1660 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22236EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22236EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22236emkd1",
      "＊22236emkd1",
      "22236EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23236EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23236EMD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 112,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1800,
    "static_load_kN": 2270,
    "fatigue_load_limit_kN": 101,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1600,
    "weight_g": 38200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23236EMD1 identifies a 180×320×112 mm (7.087 × 12.598 × 4.409 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 180 mm bore; the 112 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. At 1800 kN C and 38200 g mass the 23200 series part is built for shock and vibration; the 112 mm-wide ring needs square abutments to keep both rows equally loaded. Pu 101 kN against C0 2270 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23236EMD1 moves with cleanliness far more than with small C variations. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 180 mm set.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 180 mm bore 23236EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 23236EMD1 by envelope alone: the 2270 kN C0 and 101 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 180 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23236EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,200 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1800/2270 kN ratings, 101 kN Pu and 38200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23236EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23236EMD1?",
        "a": "23236EMD1 is an NTN double-row spherical roller bearing to ISO 15: 180 mm bore, 320 mm OD and 112 mm width (7.087 × 12.598 × 4.409 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1800 kN, C0 2270 kN, Pu 101 kN, grease limiting speed 1,200 r/min, oil 1,600 r/min, mass about 38200 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23236EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23236EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23236EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23236EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23236EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23236EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1800 kN C / 2270 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23236EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23236EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23236emd1",
      "＊23236emd1",
      "23236EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23236EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23236EMKD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 112,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1800,
    "static_load_kN": 2270,
    "fatigue_load_limit_kN": 101,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1600,
    "weight_g": 37100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23236EMKD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 180 mm shaft — 1800 kN basic dynamic capacity in a 37100 g, open ISO 15 envelope. Numbering ties 23236EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 180 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Suffix reading on 23236EMKD1: EM identifies the high-capacity execution with a one-piece machined brass cage; K marks the 1:12 tapered bore; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. Equivalent-load planning keeps a radial plus moderate axial combination on 23236EMKD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Fillet radii on shaft and housing must clear the ring chamfers of the 112 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 180 mm bore 23236EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23236EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23236EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 112 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 112 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 1800/2270 kN ratings, 101 kN Pu and 37100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23236EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23236EMKD1?",
        "a": "23236EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 180 mm bore, 320 mm OD and 112 mm width (7.087 × 12.598 × 4.409 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1800 kN, C0 2270 kN, Pu 101 kN, grease limiting speed 1,200 r/min, oil 1,600 r/min, mass about 37100 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23236EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23236EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23236EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23236EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23236EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23236EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1800 kN C / 2270 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23236EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23236EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23236emkd1",
      "＊23236emkd1",
      "23236EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22336EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22336EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 380,
    "B_mm": 126,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2420,
    "static_load_kN": 2810,
    "fatigue_load_limit_kN": 132,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1400,
    "weight_g": 70200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22336EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 180 mm bore, 380 mm OD, 126 mm width, rated 1,100 r/min on grease. Digit by digit the code reads as spherical-roller dimension series plus 180 mm bore; the 126 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Pu 132 kN is the catalogue fatigue load limit for 22336EMD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. 180 mm bore is 7.087 in and 380 mm OD is 14.961 in; the ISO 15 envelope swaps between brands, but the 2420/2810 kN ratings and cage design are NTN 2203E values. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22336EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 180 mm bore 22336EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 22336EMD1 by envelope alone: the 2810 kN C0 and 132 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The cylindrical-bore 22336EMD1 and its tapered-bore counterpart 22336EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 2420 kN rating no longer applies.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22336EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 2420/2810 kN ratings, 132 kN Pu and 70200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22336EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22336EMD1?",
        "a": "22336EMD1 is an NTN double-row spherical roller bearing to ISO 15: 180 mm bore, 380 mm OD and 126 mm width (7.087 × 14.961 × 4.961 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2420 kN, C0 2810 kN, Pu 132 kN, grease limiting speed 1,100 r/min, oil 1,400 r/min, mass about 70200 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22336EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22336EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22336EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22336EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22336EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22336EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2420 kN C / 2810 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22336EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22336EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22336emd1",
      "＊22336emd1",
      "22336EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22336EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22336EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 380,
    "B_mm": 126,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2420,
    "static_load_kN": 2810,
    "fatigue_load_limit_kN": 132,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1400,
    "weight_g": 68700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22336EMKD1 identifies a 180×380×126 mm (7.087 × 14.961 × 4.961 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Reading the full code: the number gives the 180×380 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. At 2420 kN C and 68700 g mass the 22300 series part is built for shock and vibration; the 126 mm-wide ring needs square abutments to keep both rows equally loaded. 180 mm bore is 7.087 in and 380 mm OD is 14.961 in; the ISO 15 envelope swaps between brands, but the 2420/2810 kN ratings and cage design are NTN 2203E values. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 180 mm bore 22336EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 22336EMKD1 by envelope alone: the 2810 kN C0 and 132 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22336EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Never substitute 22336EMKD1 by envelope alone: the 2810 kN C0 and 132 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,100 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 2420/2810 kN ratings, 132 kN Pu and 68700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22336EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22336EMKD1?",
        "a": "22336EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 180 mm bore, 380 mm OD and 126 mm width (7.087 × 14.961 × 4.961 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2420 kN, C0 2810 kN, Pu 132 kN, grease limiting speed 1,100 r/min, oil 1,400 r/min, mass about 68700 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22336EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22336EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22336EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22336EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22336EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22336EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2420 kN C / 2810 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22336EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22336EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22336emkd1",
      "＊22336emkd1",
      "22336EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23938EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23938EMD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 190,
    "D_mm": 260,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 603,
    "static_load_kN": 935,
    "fatigue_load_limit_kN": 62.8,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 2000,
    "weight_g": 8200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23938EMD1 belongs to the 23900 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. Reading the full code: the number gives the 190×260 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. At 603 kN C and 8200 g mass the 23900 series part is built for shock and vibration; the 52 mm-wide ring needs square abutments to keep both rows equally loaded. Catalogue mass 8200 g (8.20 kg) for the 190×260×52 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 190 mm bore 23938EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 190 mm bearing, and drive-up procedures differ.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 190 mm bearing, and drive-up procedures differ.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,600 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,600 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 603/935 kN ratings, 62.8 kN Pu and 8200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23938EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23938EMD1?",
        "a": "23938EMD1 is an NTN double-row spherical roller bearing to ISO 15: 190 mm bore, 260 mm OD and 52 mm width (7.48 × 10.236 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 603 kN, C0 935 kN, Pu 62.8 kN, grease limiting speed 1,600 r/min, oil 2,000 r/min, mass about 8200 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23938EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23938EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23938EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23938EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23938EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23938EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 603 kN C / 935 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23938EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23938EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23938emd1",
      "＊23938emd1",
      "23938EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23938EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23938EMKD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 190,
    "D_mm": 260,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 603,
    "static_load_kN": 935,
    "fatigue_load_limit_kN": 62.8,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 2000,
    "weight_g": 7960,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23938EMKD1 denotes the 190 mm bore spherical roller bearing (603 kN C / 935 kN C0) in the 23900 series, the self-aligning choice for heavy combined load. Numbering ties 23938EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 190 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Catalogue mass 7960 g (7.96 kg) for the 190×260×52 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 190 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 190 mm bore 23938EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 2,000 r/min needs drain and level design; flooding the 52 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23938EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 190 mm bearing, and drive-up procedures differ.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 190 mm bearing, and drive-up procedures differ.",
      "The 603/935 kN ratings, 62.8 kN Pu and 7960 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23938EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23938EMKD1?",
        "a": "23938EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 190 mm bore, 260 mm OD and 52 mm width (7.48 × 10.236 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 603 kN, C0 935 kN, Pu 62.8 kN, grease limiting speed 1,600 r/min, oil 2,000 r/min, mass about 7960 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23938EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23938EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23938EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23938EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23938EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23938EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 603 kN C / 935 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23938EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23938EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23938emkd1",
      "＊23938emkd1",
      "23938EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23038EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23038EAD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 190,
    "D_mm": 290,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1140,
    "static_load_kN": 1570,
    "fatigue_load_limit_kN": 83.5,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1900,
    "weight_g": 17800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23038EAD1 identifies a 190×290×75 mm (7.48 × 11.417 × 2.953 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (cylindrical), lubrication feature (D1); 23038EAD1 is assembled exactly in that order. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EA pressed-steel-cage cage. 190 mm bore is 7.48 in and 290 mm OD is 11.417 in; the ISO 15 envelope swaps between brands, but the 1140/1570 kN ratings and cage design are NTN 2203E values. Fillet radii on shaft and housing must clear the ring chamfers of the 75 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 190 mm bore 23038EAD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23038EAD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Oil relubrication toward 1,900 r/min needs drain and level design; flooding the 75 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Oil relubrication toward 1,900 r/min needs drain and level design; flooding the 75 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Never substitute 23038EAD1 by envelope alone: the 1570 kN C0 and 83.5 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 1140/1570 kN ratings, 83.5 kN Pu and 17800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23038EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23038EAD1?",
        "a": "23038EAD1 is an NTN double-row spherical roller bearing to ISO 15: 190 mm bore, 290 mm OD and 75 mm width (7.48 × 11.417 × 2.953 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1140 kN, C0 1570 kN, Pu 83.5 kN, grease limiting speed 1,500 r/min, oil 1,900 r/min, mass about 17800 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23038EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23038EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23038EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23038EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23038EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23038EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1140 kN C / 1570 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23038EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23038EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23038ead1",
      "＊23038ead1",
      "23038EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23038EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23038EAKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 190,
    "D_mm": 290,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1140,
    "static_load_kN": 1570,
    "fatigue_load_limit_kN": 83.5,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1900,
    "weight_g": 17300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23038EAKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 190 mm bore, 290 mm OD, 75 mm width, rated 1,500 r/min on grease. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (K), lubrication feature (D1); 23038EAKD1 is assembled exactly in that order. NTN prints two speeds for 23038EAKD1: 1,500 r/min grease and 1,900 r/min oil — the gap of 400 r/min reflects oil cooling of the heavy roller set. The 50.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 75 mm-wide ring seats fully on both sides. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 190 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 190 mm bore 23038EAKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 190 mm bearing, and drive-up procedures differ.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23038EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Do not confuse EA and EM at the same number: 23038EAKD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 190×290 mm envelope is identical.",
      "Oil relubrication toward 1,900 r/min needs drain and level design; flooding the 75 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 1140/1570 kN ratings, 83.5 kN Pu and 17300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23038EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23038EAKD1?",
        "a": "23038EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 190 mm bore, 290 mm OD and 75 mm width (7.48 × 11.417 × 2.953 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1140 kN, C0 1570 kN, Pu 83.5 kN, grease limiting speed 1,500 r/min, oil 1,900 r/min, mass about 17300 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23038EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23038EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23038EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23038EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23038EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23038EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1140 kN C / 1570 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23038EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23038EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23038eakd1",
      "＊23038eakd1",
      "23038EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23038EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23038EMD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 190,
    "D_mm": 290,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1140,
    "static_load_kN": 1570,
    "fatigue_load_limit_kN": 83.5,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1900,
    "weight_g": 17900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23038EMD1 identifies a 190×290×75 mm (7.48 × 11.417 × 2.953 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Numbering ties 23038EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 190 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Two symmetric roller rows share the load: C 1140 kN, C0 1570 kN (C0/C ≈ 1.38), with useful axial capacity in either direction alongside the dominant radial load. Grease/oil ratio: the 1,500 r/min limiting value is .79 of the 1,900 r/min oil value; heavy 75 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Fit the cylindrical-bore 23038EMD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 190 mm bore 23038EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23038EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The cylindrical-bore 23038EMD1 and its tapered-bore counterpart 23038EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Never substitute 23038EMD1 by envelope alone: the 1570 kN C0 and 83.5 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 190 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 1140/1570 kN ratings, 83.5 kN Pu and 17900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23038EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23038EMD1?",
        "a": "23038EMD1 is an NTN double-row spherical roller bearing to ISO 15: 190 mm bore, 290 mm OD and 75 mm width (7.48 × 11.417 × 2.953 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1140 kN, C0 1570 kN, Pu 83.5 kN, grease limiting speed 1,500 r/min, oil 1,900 r/min, mass about 17900 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23038EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23038EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23038EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23038EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23038EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23038EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1140 kN C / 1570 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23038EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23038EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23038emd1",
      "＊23038emd1",
      "23038EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23038EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23038EMKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 190,
    "D_mm": 290,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1140,
    "static_load_kN": 1570,
    "fatigue_load_limit_kN": 83.5,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1900,
    "weight_g": 17400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23038EMKD1 belongs to the 23000 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (23000 series); the bore code resolves to 190 mm (two-digit code ×5, with the 00–03 exception table), and 290 mm OD / 75 mm width follow the general plan. The 50.0 mm radial section over the 190 mm bore carries two roller rows; capacity per millimetre of bore is about 6.0 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Equivalent-load planning keeps a radial plus moderate axial combination on 23038EMKD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 190 mm bore 23038EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 190 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 75 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,500 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23038EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 1140/1570 kN ratings, 83.5 kN Pu and 17400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23038EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23038EMKD1?",
        "a": "23038EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 190 mm bore, 290 mm OD and 75 mm width (7.48 × 11.417 × 2.953 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1140 kN, C0 1570 kN, Pu 83.5 kN, grease limiting speed 1,500 r/min, oil 1,900 r/min, mass about 17400 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23038EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23038EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23038EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23038EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23038EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23038EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1140 kN C / 1570 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23038EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23038EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23038emkd1",
      "＊23038emkd1",
      "23038EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24038EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24038EMD1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 190,
    "D_mm": 290,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1360,
    "static_load_kN": 2000,
    "fatigue_load_limit_kN": 80.7,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1700,
    "weight_g": 23800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 24038EMD1 identifies a 190×290×100 mm (7.48 × 11.417 × 3.937 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. The leading digits are the ISO 15 dimension series (24000 series); the bore code resolves to 190 mm (two-digit code ×5, with the 00–03 exception table), and 290 mm OD / 100 mm width follow the general plan. The cylindrical bore fits a machined 190 mm shaft seat directly; the same envelope in 24038EMK30D1 (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Catalogue mass 23800 g (23.80 kg) for the 190×290×100 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Fit the cylindrical-bore 24038EMD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 190 mm bore 24038EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1360 kN rating no longer applies.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24038EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Never substitute 24038EMD1 by envelope alone: the 2000 kN C0 and 80.7 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Do not confuse EA and EM at the same number: 24038EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 190×290 mm envelope is identical.",
      "The 1360/2000 kN ratings, 80.7 kN Pu and 23800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24038EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24038EMD1?",
        "a": "24038EMD1 is an NTN double-row spherical roller bearing to ISO 15: 190 mm bore, 290 mm OD and 100 mm width (7.48 × 11.417 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1360 kN, C0 2000 kN, Pu 80.7 kN, grease limiting speed 1,300 r/min, oil 1,700 r/min, mass about 23800 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24038EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24038EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24038EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24038EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24038EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24038EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1360 kN C / 2000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24038EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24038EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24038emd1",
      "＊24038emd1",
      "24038EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24038EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24038EMK30D1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 190,
    "D_mm": 290,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1360,
    "static_load_kN": 2000,
    "fatigue_load_limit_kN": 80.7,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1700,
    "weight_g": 23400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24038EMK30D1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 190 mm shaft — 1360 kN basic dynamic capacity in a 23400 g, open ISO 15 envelope. The leading digits are the ISO 15 dimension series (24000 series); the bore code resolves to 190 mm (two-digit code ×5, with the 00–03 exception table), and 290 mm OD / 100 mm width follow the general plan. NTN prints two speeds for 24038EMK30D1: 1,300 r/min grease and 1,700 r/min oil — the gap of 400 r/min reflects oil cooling of the heavy roller set. Pu 80.7 kN against C0 2000 kN anchors the contamination derating; for dirty mining duty the adjusted life of 24038EMK30D1 moves with cleanliness far more than with small C variations. Never mount 24038EMK30D1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 290 mm race.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 190 mm bore 24038EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 100 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 190 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 24038EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Oil relubrication toward 1,700 r/min needs drain and level design; flooding the 100 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 1360/2000 kN ratings, 80.7 kN Pu and 23400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24038EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24038EMK30D1?",
        "a": "24038EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 190 mm bore, 290 mm OD and 100 mm width (7.48 × 11.417 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1360 kN, C0 2000 kN, Pu 80.7 kN, grease limiting speed 1,300 r/min, oil 1,700 r/min, mass about 23400 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 24038EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 190 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24038EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24038EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24038EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24038EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24038EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1360 kN C / 2000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24038EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24038EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24038emk30d1",
      "＊24038emk30d1",
      "24038EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23138EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23138EMD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 190,
    "D_mm": 320,
    "B_mm": 104,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1670,
    "static_load_kN": 2250,
    "fatigue_load_limit_kN": 100,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1600,
    "weight_g": 34300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 190 mm shaft, NTN supplies 23138EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,600 r/min. Digit by digit the code reads as spherical-roller dimension series plus 190 mm bore; the 104 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Equivalent-load planning keeps a radial plus moderate axial combination on 23138EMD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 190 mm bore 23138EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 190 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 190 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 104 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23138EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 1670/2250 kN ratings, 100 kN Pu and 34300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23138EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23138EMD1?",
        "a": "23138EMD1 is an NTN double-row spherical roller bearing to ISO 15: 190 mm bore, 320 mm OD and 104 mm width (7.48 × 12.598 × 4.094 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1670 kN, C0 2250 kN, Pu 100 kN, grease limiting speed 1,200 r/min, oil 1,600 r/min, mass about 34300 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23138EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23138EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23138EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23138EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23138EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23138EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1670 kN C / 2250 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23138EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23138EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23138emd1",
      "＊23138emd1",
      "23138EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23138EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23138EMKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 190,
    "D_mm": 320,
    "B_mm": 104,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1670,
    "static_load_kN": 2250,
    "fatigue_load_limit_kN": 100,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1600,
    "weight_g": 33200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23138EMKD1 denotes the 190 mm bore spherical roller bearing (1670 kN C / 2250 kN C0) in the 23100 series, the self-aligning choice for heavy combined load. Reading the full code: the number gives the 190×320 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. The 1:12 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 190 mm bore assembly. Equivalent-load planning keeps a radial plus moderate axial combination on 23138EMKD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Mount 23138EMKD1 on its adapter or withdrawal sleeve on the 190 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 190 mm bore 23138EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1670 kN rating no longer applies.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23138EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Never substitute 23138EMKD1 by envelope alone: the 2250 kN C0 and 100 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Do not confuse EA and EM at the same number: 23138EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 190×320 mm envelope is identical.",
      "The 1670/2250 kN ratings, 100 kN Pu and 33200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23138EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23138EMKD1?",
        "a": "23138EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 190 mm bore, 320 mm OD and 104 mm width (7.48 × 12.598 × 4.094 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1670 kN, C0 2250 kN, Pu 100 kN, grease limiting speed 1,200 r/min, oil 1,600 r/min, mass about 33200 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23138EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23138EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23138EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23138EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23138EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23138EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1670 kN C / 2250 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23138EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23138EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23138emkd1",
      "＊23138emkd1",
      "23138EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24138EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24138EMD1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 190,
    "D_mm": 320,
    "B_mm": 128,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1900,
    "static_load_kN": 2700,
    "fatigue_load_limit_kN": 96.8,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1500,
    "weight_g": 42100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24138EMD1 belongs to the 24100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. Reading the full code: the number gives the 190×320 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. Two symmetric roller rows share the load: C 1900 kN, C0 2700 kN (C0/C ≈ 1.42), with useful axial capacity in either direction alongside the dominant radial load. 190 mm bore is 7.48 in and 320 mm OD is 12.598 in; the ISO 15 envelope swaps between brands, but the 1900/2700 kN ratings and cage design are NTN 2203E values. Fit the cylindrical-bore 24138EMD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 190 mm bore 24138EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 1,500 r/min needs drain and level design; flooding the 128 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Never substitute 24138EMD1 by envelope alone: the 2700 kN C0 and 96.8 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,200 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 190 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 1900/2700 kN ratings, 96.8 kN Pu and 42100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24138EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24138EMD1?",
        "a": "24138EMD1 is an NTN double-row spherical roller bearing to ISO 15: 190 mm bore, 320 mm OD and 128 mm width (7.48 × 12.598 × 5.039 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1900 kN, C0 2700 kN, Pu 96.8 kN, grease limiting speed 1,200 r/min, oil 1,500 r/min, mass about 42100 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24138EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24138EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24138EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24138EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24138EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24138EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1900 kN C / 2700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24138EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24138EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24138emd1",
      "＊24138emd1",
      "24138EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24138EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24138EMK30D1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 190,
    "D_mm": 320,
    "B_mm": 128,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1900,
    "static_load_kN": 2700,
    "fatigue_load_limit_kN": 96.8,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1500,
    "weight_g": 41500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 24138EMK30D1 with a 1:30 tapered bore (K30) and D1 outer-ring annular oil groove with holes: 190 mm bore, 320 mm OD, 128 mm width, rated 1,200 r/min on grease. Reading the full code: the number gives the 190×320 mm envelope, EM names the cage/capacity execution, K30 marks the 1:30 tapered bore for sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. Pu 96.8 kN is the catalogue fatigue load limit for 24138EMK30D1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. The 65.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 128 mm-wide ring seats fully on both sides. Mount 24138EMK30D1 on its adapter or withdrawal sleeve on the 190 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 190 mm bore 24138EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24138EMK30D1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24138EMK30D1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 190 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24138EMK30D1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 1900/2700 kN ratings, 96.8 kN Pu and 41500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24138EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24138EMK30D1?",
        "a": "24138EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 190 mm bore, 320 mm OD and 128 mm width (7.48 × 12.598 × 5.039 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1900 kN, C0 2700 kN, Pu 96.8 kN, grease limiting speed 1,200 r/min, oil 1,500 r/min, mass about 41500 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24138EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 190 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24138EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24138EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24138EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24138EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24138EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1900 kN C / 2700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24138EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24138EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24138emk30d1",
      "＊24138emk30d1",
      "24138EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22238EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22238EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 92,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1620,
    "static_load_kN": 1870,
    "fatigue_load_limit_kN": 112,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1800,
    "weight_g": 35600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22238EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 190 mm shaft — 1620 kN basic dynamic capacity in a 35600 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 190 mm bore; the 92 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Two symmetric roller rows share the load: C 1620 kN, C0 1870 kN (C0/C ≈ 1.15), with useful axial capacity in either direction alongside the dominant radial load. Speed planning: 1,400 r/min grease limiting speed is the cage/kinematic ceiling and 1,800 r/min is the oil-lubricated value for the 190 mm bore; vibrating screens rarely approach either and are load/cage limited instead. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22238EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 190 mm bore 22238EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 190 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1620 kN rating no longer applies.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22238EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 190 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 1620/1870 kN ratings, 112 kN Pu and 35600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22238EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22238EMD1?",
        "a": "22238EMD1 is an NTN double-row spherical roller bearing to ISO 15: 190 mm bore, 340 mm OD and 92 mm width (7.48 × 13.386 × 3.622 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1620 kN, C0 1870 kN, Pu 112 kN, grease limiting speed 1,400 r/min, oil 1,800 r/min, mass about 35600 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22238EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22238EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22238EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22238EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22238EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22238EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1620 kN C / 1870 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22238EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22238EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22238emd1",
      "＊22238emd1",
      "22238EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22238EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22238EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 92,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1620,
    "static_load_kN": 1870,
    "fatigue_load_limit_kN": 112,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1800,
    "weight_g": 34900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 22238EMKD1 denotes the 190 mm bore spherical roller bearing (1620 kN C / 1870 kN C0) in the 22200 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (22200 series); the bore code resolves to 190 mm (two-digit code ×5, with the 00–03 exception table), and 340 mm OD / 92 mm width follow the general plan. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. With about 8.5 kN of C per millimetre of the 190 mm bore, 22238EMKD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Mount 22238EMKD1 on its adapter or withdrawal sleeve on the 190 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 190 mm bore 22238EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,400 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Oil relubrication toward 1,800 r/min needs drain and level design; flooding the 92 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1620 kN rating no longer applies.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 190 mm bearing, and drive-up procedures differ.",
      "The 1620/1870 kN ratings, 112 kN Pu and 34900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22238EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22238EMKD1?",
        "a": "22238EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 190 mm bore, 340 mm OD and 92 mm width (7.48 × 13.386 × 3.622 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1620 kN, C0 1870 kN, Pu 112 kN, grease limiting speed 1,400 r/min, oil 1,800 r/min, mass about 34900 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22238EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22238EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22238EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22238EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22238EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22238EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1620 kN C / 1870 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22238EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22238EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22238emkd1",
      "＊22238emkd1",
      "22238EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23238EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23238EMD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 120,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1990,
    "static_load_kN": 2480,
    "fatigue_load_limit_kN": 109,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1500,
    "weight_g": 46100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23238EMD1 identifies a 190×340×120 mm (7.48 × 13.386 × 4.724 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 23238EMD1 is assembled exactly in that order. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. Selection: the C0/C ratio of 1.25 (2480/1990 kN) reflects the heavy static and shock proportioning of 23238EMD1; size the equivalent load at the required L10 with shock factor for the application. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 190 mm bore 23238EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1990 kN rating no longer applies.",
      "The cylindrical-bore 23238EMD1 and its tapered-bore counterpart 23238EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23238EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Never substitute 23238EMD1 by envelope alone: the 2480 kN C0 and 109 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 1990/2480 kN ratings, 109 kN Pu and 46100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23238EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23238EMD1?",
        "a": "23238EMD1 is an NTN double-row spherical roller bearing to ISO 15: 190 mm bore, 340 mm OD and 120 mm width (7.48 × 13.386 × 4.724 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1990 kN, C0 2480 kN, Pu 109 kN, grease limiting speed 1,200 r/min, oil 1,500 r/min, mass about 46100 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23238EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23238EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23238EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23238EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23238EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23238EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1990 kN C / 2480 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23238EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23238EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23238emd1",
      "＊23238emd1",
      "23238EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23238EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23238EMKD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 120,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1990,
    "static_load_kN": 2480,
    "fatigue_load_limit_kN": 109,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1500,
    "weight_g": 44700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23238EMKD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 190 mm shaft — 1990 kN basic dynamic capacity in a 44700 g, open ISO 15 envelope. Numbering ties 23238EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 190 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Grease/oil ratio: the 1,200 r/min limiting value is .80 of the 1,500 r/min oil value; heavy 120 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Fillet radii on shaft and housing must clear the ring chamfers of the 120 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 190 mm bore 23238EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 1,500 r/min needs drain and level design; flooding the 120 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Oil relubrication toward 1,500 r/min needs drain and level design; flooding the 120 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Never substitute 23238EMKD1 by envelope alone: the 2480 kN C0 and 109 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23238EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 1990/2480 kN ratings, 109 kN Pu and 44700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23238EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23238EMKD1?",
        "a": "23238EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 190 mm bore, 340 mm OD and 120 mm width (7.48 × 13.386 × 4.724 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1990 kN, C0 2480 kN, Pu 109 kN, grease limiting speed 1,200 r/min, oil 1,500 r/min, mass about 44700 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23238EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23238EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23238EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23238EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23238EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23238EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1990 kN C / 2480 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23238EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23238EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23238emkd1",
      "＊23238emkd1",
      "23238EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22338EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22338EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 190,
    "D_mm": 400,
    "B_mm": 132,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2600,
    "static_load_kN": 3120,
    "fatigue_load_limit_kN": 145,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1300,
    "weight_g": 81500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 190 mm shaft, NTN supplies 22338EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,300 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 22338EMD1 is assembled exactly in that order. The cylindrical bore fits a machined 190 mm shaft seat directly; the same envelope in 22338EMKD1 (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Pu 145 kN against C0 3120 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22338EMD1 moves with cleanliness far more than with small C variations. Fillet radii on shaft and housing must clear the ring chamfers of the 132 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 190 mm bore 22338EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 2600 kN rating no longer applies.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,000 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Oil relubrication toward 1,300 r/min needs drain and level design; flooding the 132 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Do not confuse EA and EM at the same number: 22338EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 190×400 mm envelope is identical.",
      "The 2600/3120 kN ratings, 145 kN Pu and 81500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22338EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22338EMD1?",
        "a": "22338EMD1 is an NTN double-row spherical roller bearing to ISO 15: 190 mm bore, 400 mm OD and 132 mm width (7.48 × 15.748 × 5.197 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2600 kN, C0 3120 kN, Pu 145 kN, grease limiting speed 1,000 r/min, oil 1,300 r/min, mass about 81500 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22338EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22338EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22338EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22338EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22338EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22338EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2600 kN C / 3120 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22338EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22338EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22338emd1",
      "＊22338emd1",
      "22338EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22338EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22338EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 190,
    "D_mm": 400,
    "B_mm": 132,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2600,
    "static_load_kN": 3120,
    "fatigue_load_limit_kN": 145,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1300,
    "weight_g": 79900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22338EMKD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 190 mm shaft — 2600 kN basic dynamic capacity in a 79900 g, open ISO 15 envelope. Reading the full code: the number gives the 190×400 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. Pu 145 kN is the catalogue fatigue load limit for 22338EMKD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. With about 13.7 kN of C per millimetre of the 190 mm bore, 22338EMKD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22338EMKD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 190 mm bore 22338EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 22338EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 190×400 mm envelope is identical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,000 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22338EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22338EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 2600/3120 kN ratings, 145 kN Pu and 79900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22338EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22338EMKD1?",
        "a": "22338EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 190 mm bore, 400 mm OD and 132 mm width (7.48 × 15.748 × 5.197 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2600 kN, C0 3120 kN, Pu 145 kN, grease limiting speed 1,000 r/min, oil 1,300 r/min, mass about 79900 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22338EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22338EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22338EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22338EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22338EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22338EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2600 kN C / 3120 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22338EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22338EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22338emkd1",
      "＊22338emkd1",
      "22338EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23940EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23940EMD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 200,
    "D_mm": 280,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 766,
    "static_load_kN": 1190,
    "fatigue_load_limit_kN": 71.8,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1900,
    "weight_g": 12000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 200 mm shaft, NTN supplies 23940EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,900 r/min. Digit by digit the code reads as spherical-roller dimension series plus 200 mm bore; the 60 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Two symmetric roller rows share the load: C 766 kN, C0 1190 kN (C0/C ≈ 1.55), with useful axial capacity in either direction alongside the dominant radial load. Speed planning: 1,500 r/min grease limiting speed is the cage/kinematic ceiling and 1,900 r/min is the oil-lubricated value for the 200 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Fillet radii on shaft and housing must clear the ring chamfers of the 60 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 200 mm bore 23940EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 60 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 200 mm bearing, and drive-up procedures differ.",
      "Do not confuse EA and EM at the same number: 23940EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 200×280 mm envelope is identical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 200 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 766/1190 kN ratings, 71.8 kN Pu and 12000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23940EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23940EMD1?",
        "a": "23940EMD1 is an NTN double-row spherical roller bearing to ISO 15: 200 mm bore, 280 mm OD and 60 mm width (7.874 × 11.024 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 766 kN, C0 1190 kN, Pu 71.8 kN, grease limiting speed 1,500 r/min, oil 1,900 r/min, mass about 12000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23940EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23940EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23940EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23940EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23940EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23940EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 766 kN C / 1190 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23940EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23940EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23940emd1",
      "＊23940emd1",
      "23940EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23940EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23940EMKD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 200,
    "D_mm": 280,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 766,
    "static_load_kN": 1190,
    "fatigue_load_limit_kN": 71.8,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1900,
    "weight_g": 11600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23940EMKD1 denotes the 200 mm bore spherical roller bearing (766 kN C / 1190 kN C0) in the 23900 series, the self-aligning choice for heavy combined load. Reading the full code: the number gives the 200×280 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. The 1:12 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 200 mm bore assembly. Catalogue mass 11600 g (11.60 kg) for the 200×280×60 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 200 mm bore 23940EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 766 kN rating no longer applies.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,500 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Oil relubrication toward 1,900 r/min needs drain and level design; flooding the 60 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Do not confuse EA and EM at the same number: 23940EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 200×280 mm envelope is identical.",
      "The 766/1190 kN ratings, 71.8 kN Pu and 11600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23940EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23940EMKD1?",
        "a": "23940EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 200 mm bore, 280 mm OD and 60 mm width (7.874 × 11.024 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 766 kN, C0 1190 kN, Pu 71.8 kN, grease limiting speed 1,500 r/min, oil 1,900 r/min, mass about 11600 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23940EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23940EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23940EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23940EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23940EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23940EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 766 kN C / 1190 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23940EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23940EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23940emkd1",
      "＊23940emkd1",
      "23940EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23040EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23040EMD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 200,
    "D_mm": 310,
    "B_mm": 82,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1310,
    "static_load_kN": 1790,
    "fatigue_load_limit_kN": 94.1,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1800,
    "weight_g": 22800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23040EMD1 denotes the 200 mm bore spherical roller bearing (1310 kN C / 1790 kN C0) in the 23000 series, the self-aligning choice for heavy combined load. Reading the full code: the number gives the 200×310 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. Pu 94.1 kN is the catalogue fatigue load limit for 23040EMD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Speed planning: 1,400 r/min grease limiting speed is the cage/kinematic ceiling and 1,800 r/min is the oil-lubricated value for the 200 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Fillet radii on shaft and housing must clear the ring chamfers of the 82 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 200 mm bore 23040EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23040EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 82 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Do not confuse EA and EM at the same number: 23040EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 200×310 mm envelope is identical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23040EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 1310/1790 kN ratings, 94.1 kN Pu and 22800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23040EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23040EMD1?",
        "a": "23040EMD1 is an NTN double-row spherical roller bearing to ISO 15: 200 mm bore, 310 mm OD and 82 mm width (7.874 × 12.205 × 3.228 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1310 kN, C0 1790 kN, Pu 94.1 kN, grease limiting speed 1,400 r/min, oil 1,800 r/min, mass about 22800 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23040EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23040EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23040EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23040EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23040EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23040EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1310 kN C / 1790 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23040EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23040EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23040emd1",
      "＊23040emd1",
      "23040EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23040EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23040EMKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 200,
    "D_mm": 310,
    "B_mm": 82,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1310,
    "static_load_kN": 1790,
    "fatigue_load_limit_kN": 94.1,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1800,
    "weight_g": 22100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 200 mm shaft, NTN supplies 23040EMKD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,800 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 23040EMKD1 is assembled exactly in that order. At 1310 kN C and 22100 g mass the 23000 series part is built for shock and vibration; the 82 mm-wide ring needs square abutments to keep both rows equally loaded. Equivalent-load planning keeps a radial plus moderate axial combination on 23040EMKD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Fillet radii on shaft and housing must clear the ring chamfers of the 82 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 200 mm bore 23040EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23040EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 200 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23040EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,400 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1310/1790 kN ratings, 94.1 kN Pu and 22100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23040EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23040EMKD1?",
        "a": "23040EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 200 mm bore, 310 mm OD and 82 mm width (7.874 × 12.205 × 3.228 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1310 kN, C0 1790 kN, Pu 94.1 kN, grease limiting speed 1,400 r/min, oil 1,800 r/min, mass about 22100 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23040EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23040EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23040EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23040EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23040EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23040EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1310 kN C / 1790 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23040EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23040EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23040emkd1",
      "＊23040emkd1",
      "23040EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24040EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24040EMD1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 200,
    "D_mm": 310,
    "B_mm": 109,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1570,
    "static_load_kN": 2280,
    "fatigue_load_limit_kN": 91.1,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1600,
    "weight_g": 30200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24040EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 200 mm shaft — 1570 kN basic dynamic capacity in a 30200 g, open ISO 15 envelope. Numbering ties 24040EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 200 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Open by design, 24040EMD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Speed planning: 1,200 r/min grease limiting speed is the cage/kinematic ceiling and 1,600 r/min is the oil-lubricated value for the 200 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 200 mm bore 24040EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 200 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24040EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The cylindrical-bore 24040EMD1 and its tapered-bore counterpart 24040EMK30D1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1570 kN rating no longer applies.",
      "The 1570/2280 kN ratings, 91.1 kN Pu and 30200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24040EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24040EMD1?",
        "a": "24040EMD1 is an NTN double-row spherical roller bearing to ISO 15: 200 mm bore, 310 mm OD and 109 mm width (7.874 × 12.205 × 4.291 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1570 kN, C0 2280 kN, Pu 91.1 kN, grease limiting speed 1,200 r/min, oil 1,600 r/min, mass about 30200 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24040EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24040EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24040EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24040EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24040EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24040EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1570 kN C / 2280 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24040EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24040EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24040emd1",
      "＊24040emd1",
      "24040EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24040EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24040EMK30D1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 200,
    "D_mm": 310,
    "B_mm": 109,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1570,
    "static_load_kN": 2280,
    "fatigue_load_limit_kN": 91.1,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1600,
    "weight_g": 29700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24040EMK30D1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 200 mm shaft — 1570 kN basic dynamic capacity in a 29700 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 200 mm bore; the 109 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. At 1570 kN C and 29700 g mass the 24000 series part is built for shock and vibration; the 109 mm-wide ring needs square abutments to keep both rows equally loaded. 200 mm bore is 7.874 in and 310 mm OD is 12.205 in; the ISO 15 envelope swaps between brands, but the 1570/2280 kN ratings and cage design are NTN 2203E values. Fillet radii on shaft and housing must clear the ring chamfers of the 109 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 200 mm bore 24040EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 24040EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24040EMK30D1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Never substitute 24040EMK30D1 by envelope alone: the 2280 kN C0 and 91.1 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,200 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1570/2280 kN ratings, 91.1 kN Pu and 29700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24040EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24040EMK30D1?",
        "a": "24040EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 200 mm bore, 310 mm OD and 109 mm width (7.874 × 12.205 × 4.291 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1570 kN, C0 2280 kN, Pu 91.1 kN, grease limiting speed 1,200 r/min, oil 1,600 r/min, mass about 29700 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 24040EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 200 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24040EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24040EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24040EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24040EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24040EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1570 kN C / 2280 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24040EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24040EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24040emk30d1",
      "＊24040emk30d1",
      "24040EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23140EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23140EMD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 200,
    "D_mm": 340,
    "B_mm": 112,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1890,
    "static_load_kN": 2510,
    "fatigue_load_limit_kN": 110,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1400,
    "weight_g": 41900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23140EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 200 mm bore, 340 mm OD, 112 mm width, rated 1,100 r/min on grease. Numbering ties 23140EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 200 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The 70.0 mm radial section over the 200 mm bore carries two roller rows; capacity per millimetre of bore is about 9.4 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Catalogue mass 41900 g (41.90 kg) for the 200×340×112 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Fillet radii on shaft and housing must clear the ring chamfers of the 112 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 200 mm bore 23140EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 200 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 200 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 200 mm bearing, and drive-up procedures differ.",
      "The cylindrical-bore 23140EMD1 and its tapered-bore counterpart 23140EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 1890/2510 kN ratings, 110 kN Pu and 41900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23140EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23140EMD1?",
        "a": "23140EMD1 is an NTN double-row spherical roller bearing to ISO 15: 200 mm bore, 340 mm OD and 112 mm width (7.874 × 13.386 × 4.409 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1890 kN, C0 2510 kN, Pu 110 kN, grease limiting speed 1,100 r/min, oil 1,400 r/min, mass about 41900 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23140EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23140EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23140EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23140EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23140EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23140EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1890 kN C / 2510 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23140EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23140EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23140emd1",
      "＊23140emd1",
      "23140EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23140EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23140EMKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 200,
    "D_mm": 340,
    "B_mm": 112,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1890,
    "static_load_kN": 2510,
    "fatigue_load_limit_kN": 110,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1400,
    "weight_g": 40600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23140EMKD1 belongs to the 23100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. Numbering ties 23140EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 200 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. With about 9.4 kN of C per millimetre of the 200 mm bore, 23140EMKD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Never mount 23140EMKD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 340 mm race.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 200 mm bore 23140EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1890 kN rating no longer applies.",
      "Never substitute 23140EMKD1 by envelope alone: the 2510 kN C0 and 110 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23140EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 200 mm bearing, and drive-up procedures differ.",
      "The 1890/2510 kN ratings, 110 kN Pu and 40600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23140EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23140EMKD1?",
        "a": "23140EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 200 mm bore, 340 mm OD and 112 mm width (7.874 × 13.386 × 4.409 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1890 kN, C0 2510 kN, Pu 110 kN, grease limiting speed 1,100 r/min, oil 1,400 r/min, mass about 40600 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23140EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23140EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23140EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23140EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23140EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23140EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1890 kN C / 2510 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23140EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23140EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23140emkd1",
      "＊23140emkd1",
      "23140EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24140EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24140EMD1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 200,
    "D_mm": 340,
    "B_mm": 140,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2130,
    "static_load_kN": 2930,
    "fatigue_load_limit_kN": 105,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1400,
    "weight_g": 51500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 200 mm shaft, NTN supplies 24140EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,400 r/min. Digit by digit the code reads as spherical-roller dimension series plus 200 mm bore; the 140 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The cylindrical bore fits a machined 200 mm shaft seat directly; the same envelope in 24140EMK30D1 (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Catalogue mass 51500 g (51.50 kg) for the 200×340×140 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 200 mm bore 24140EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 2130 kN rating no longer applies.",
      "Never substitute 24140EMD1 by envelope alone: the 2930 kN C0 and 105 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Do not confuse EA and EM at the same number: 24140EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 200×340 mm envelope is identical.",
      "Do not confuse EA and EM at the same number: 24140EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 200×340 mm envelope is identical.",
      "The 2130/2930 kN ratings, 105 kN Pu and 51500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24140EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24140EMD1?",
        "a": "24140EMD1 is an NTN double-row spherical roller bearing to ISO 15: 200 mm bore, 340 mm OD and 140 mm width (7.874 × 13.386 × 5.512 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2130 kN, C0 2930 kN, Pu 105 kN, grease limiting speed 1,100 r/min, oil 1,400 r/min, mass about 51500 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24140EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24140EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24140EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24140EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24140EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24140EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2130 kN C / 2930 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24140EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24140EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24140emd1",
      "＊24140emd1",
      "24140EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24140EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24140EMK30D1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 200,
    "D_mm": 340,
    "B_mm": 140,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2130,
    "static_load_kN": 2930,
    "fatigue_load_limit_kN": 105,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1400,
    "weight_g": 50700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 24140EMK30D1 with a 1:30 tapered bore (K30) and D1 outer-ring annular oil groove with holes: 200 mm bore, 340 mm OD, 140 mm width, rated 1,100 r/min on grease. Reading the full code: the number gives the 200×340 mm envelope, EM names the cage/capacity execution, K30 marks the 1:30 tapered bore for sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. NTN prints two speeds for 24140EMK30D1: 1,100 r/min grease and 1,400 r/min oil — the gap of 300 r/min reflects oil cooling of the heavy roller set. Selection: the C0/C ratio of 1.38 (2930/2130 kN) reflects the heavy static and shock proportioning of 24140EMK30D1; size the equivalent load at the required L10 with shock factor for the application. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 200 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 200 mm bore 24140EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 140 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 200 mm bearing, and drive-up procedures differ.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24140EMK30D1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Oil relubrication toward 1,400 r/min needs drain and level design; flooding the 140 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 2130/2930 kN ratings, 105 kN Pu and 50700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24140EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24140EMK30D1?",
        "a": "24140EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 200 mm bore, 340 mm OD and 140 mm width (7.874 × 13.386 × 5.512 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2130 kN, C0 2930 kN, Pu 105 kN, grease limiting speed 1,100 r/min, oil 1,400 r/min, mass about 50700 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24140EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 200 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24140EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24140EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24140EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24140EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24140EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2130 kN C / 2930 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24140EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24140EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24140emk30d1",
      "＊24140emk30d1",
      "24140EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22240EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22240EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 200,
    "D_mm": 360,
    "B_mm": 98,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1810,
    "static_load_kN": 2100,
    "fatigue_load_limit_kN": 124,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1700,
    "weight_g": 42700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 22240EMD1 denotes the 200 mm bore spherical roller bearing (1810 kN C / 2100 kN C0) in the 22200 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (22200 series); the bore code resolves to 200 mm (two-digit code ×5, with the 00–03 exception table), and 360 mm OD / 98 mm width follow the general plan. Suffix reading on 22240EMD1: EM identifies the high-capacity execution with a one-piece machined brass cage; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. Equivalent-load planning keeps a radial plus moderate axial combination on 22240EMD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 200 mm set.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 200 mm bore 22240EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22240EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1810 kN rating no longer applies.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1810 kN rating no longer applies.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 98 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 1810/2100 kN ratings, 124 kN Pu and 42700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22240EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22240EMD1?",
        "a": "22240EMD1 is an NTN double-row spherical roller bearing to ISO 15: 200 mm bore, 360 mm OD and 98 mm width (7.874 × 14.173 × 3.858 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1810 kN, C0 2100 kN, Pu 124 kN, grease limiting speed 1,400 r/min, oil 1,700 r/min, mass about 42700 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22240EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22240EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22240EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22240EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22240EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22240EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1810 kN C / 2100 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22240EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22240EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22240emd1",
      "＊22240emd1",
      "22240EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22240EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22240EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 200,
    "D_mm": 360,
    "B_mm": 98,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1810,
    "static_load_kN": 2100,
    "fatigue_load_limit_kN": 124,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1700,
    "weight_g": 41800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22240EMKD1 belongs to the 22200 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 22240EMKD1 is assembled exactly in that order. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. With about 9.1 kN of C per millimetre of the 200 mm bore, 22240EMKD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 200 mm bore 22240EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22240EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Do not confuse EA and EM at the same number: 22240EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 200×360 mm envelope is identical.",
      "Do not confuse EA and EM at the same number: 22240EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 200×360 mm envelope is identical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22240EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 1810/2100 kN ratings, 124 kN Pu and 41800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22240EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22240EMKD1?",
        "a": "22240EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 200 mm bore, 360 mm OD and 98 mm width (7.874 × 14.173 × 3.858 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1810 kN, C0 2100 kN, Pu 124 kN, grease limiting speed 1,400 r/min, oil 1,700 r/min, mass about 41800 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22240EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22240EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22240EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22240EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22240EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22240EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1810 kN C / 2100 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22240EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22240EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22240emkd1",
      "＊22240emkd1",
      "22240EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23240EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23240EMD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 200,
    "D_mm": 360,
    "B_mm": 128,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2250,
    "static_load_kN": 2840,
    "fatigue_load_limit_kN": 120,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 55200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23240EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 200 mm shaft — 2250 kN basic dynamic capacity in a 55200 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 200 mm bore; the 128 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. 200 mm bore is 7.874 in and 360 mm OD is 14.173 in; the ISO 15 envelope swaps between brands, but the 2250/2840 kN ratings and cage design are NTN 2203E values. Fillet radii on shaft and housing must clear the ring chamfers of the 128 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 200 mm bore 23240EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 2250 kN rating no longer applies.",
      "The cylindrical-bore 23240EMD1 and its tapered-bore counterpart 23240EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23240EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23240EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 2250/2840 kN ratings, 120 kN Pu and 55200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23240EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23240EMD1?",
        "a": "23240EMD1 is an NTN double-row spherical roller bearing to ISO 15: 200 mm bore, 360 mm OD and 128 mm width (7.874 × 14.173 × 5.039 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2250 kN, C0 2840 kN, Pu 120 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 55200 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23240EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23240EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23240EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23240EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23240EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23240EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2250 kN C / 2840 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23240EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23240EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23240emd1",
      "＊23240emd1",
      "23240EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23240EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23240EMKD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 200,
    "D_mm": 360,
    "B_mm": 128,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2250,
    "static_load_kN": 2840,
    "fatigue_load_limit_kN": 120,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 53600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23240EMKD1 denotes the 200 mm bore spherical roller bearing (2250 kN C / 2840 kN C0) in the 23200 series, the self-aligning choice for heavy combined load. Digit by digit the code reads as spherical-roller dimension series plus 200 mm bore; the 128 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Pu 120 kN is the catalogue fatigue load limit for 23240EMKD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. With about 11.3 kN of C per millimetre of the 200 mm bore, 23240EMKD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 200 mm set.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 200 mm bore 23240EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 1,300 r/min needs drain and level design; flooding the 128 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Do not confuse EA and EM at the same number: 23240EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 200×360 mm envelope is identical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 200 mm bearing, and drive-up procedures differ.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23240EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 2250/2840 kN ratings, 120 kN Pu and 53600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23240EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23240EMKD1?",
        "a": "23240EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 200 mm bore, 360 mm OD and 128 mm width (7.874 × 14.173 × 5.039 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2250 kN, C0 2840 kN, Pu 120 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 53600 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23240EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23240EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23240EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23240EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23240EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23240EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2250 kN C / 2840 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23240EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23240EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23240emkd1",
      "＊23240emkd1",
      "23240EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22340EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22340EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 200,
    "D_mm": 420,
    "B_mm": 138,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2830,
    "static_load_kN": 3530,
    "fatigue_load_limit_kN": 158,
    "limiting_speed_rpm": 950,
    "max_rpm": 950,
    "speed_oil_rpm": 1200,
    "weight_g": 94600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22340EMD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 200×420×138 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). Reading the full code: the number gives the 200×420 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. The 110.0 mm radial section over the 200 mm bore carries two roller rows; capacity per millimetre of bore is about 14.2 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Selection: the C0/C ratio of 1.25 (3530/2830 kN) reflects the heavy static and shock proportioning of 22340EMD1; size the equivalent load at the required L10 with shock factor for the application. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 200 mm bore 22340EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 200 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 200 mm bearing, and drive-up procedures differ.",
      "Never substitute 22340EMD1 by envelope alone: the 3530 kN C0 and 158 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The cylindrical-bore 22340EMD1 and its tapered-bore counterpart 22340EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 2830/3530 kN ratings, 158 kN Pu and 94600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22340EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22340EMD1?",
        "a": "22340EMD1 is an NTN double-row spherical roller bearing to ISO 15: 200 mm bore, 420 mm OD and 138 mm width (7.874 × 16.535 × 5.433 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2830 kN, C0 3530 kN, Pu 158 kN, grease limiting speed 950 r/min, oil 1,200 r/min, mass about 94600 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22340EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22340EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22340EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22340EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22340EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22340EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2830 kN C / 3530 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22340EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22340EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22340emd1",
      "＊22340emd1",
      "22340EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22340EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22340EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 200,
    "D_mm": 420,
    "B_mm": 138,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2830,
    "static_load_kN": 3530,
    "fatigue_load_limit_kN": 158,
    "limiting_speed_rpm": 950,
    "max_rpm": 950,
    "speed_oil_rpm": 1200,
    "weight_g": 92700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 22340EMKD1 denotes the 200 mm bore spherical roller bearing (2830 kN C / 3530 kN C0) in the 22300 series, the self-aligning choice for heavy combined load. Numbering ties 22340EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 200 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Open by design, 22340EMKD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Speed planning: 950 r/min grease limiting speed is the cage/kinematic ceiling and 1,200 r/min is the oil-lubricated value for the 200 mm bore; vibrating screens rarely approach either and are load/cage limited instead. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 200 mm set.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 200 mm bore 22340EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 22340EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 200×420 mm envelope is identical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22340EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Do not confuse EA and EM at the same number: 22340EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 200×420 mm envelope is identical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 2830 kN rating no longer applies.",
      "The 2830/3530 kN ratings, 158 kN Pu and 92700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22340EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22340EMKD1?",
        "a": "22340EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 200 mm bore, 420 mm OD and 138 mm width (7.874 × 16.535 × 5.433 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2830 kN, C0 3530 kN, Pu 158 kN, grease limiting speed 950 r/min, oil 1,200 r/min, mass about 92700 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22340EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22340EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22340EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22340EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22340EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22340EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2830 kN C / 3530 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22340EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22340EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22340emkd1",
      "＊22340emkd1",
      "22340EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23944EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23944EMD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 220,
    "D_mm": 300,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 789,
    "static_load_kN": 1260,
    "fatigue_load_limit_kN": 79.4,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1700,
    "weight_g": 12500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23944EMD1 belongs to the 23900 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 220 mm (two-digit code ×5, with the 00–03 exception table), and 300 mm OD / 60 mm width follow the general plan. The 40.0 mm radial section over the 220 mm bore carries two roller rows; capacity per millimetre of bore is about 3.6 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Grease/oil ratio: the 1,400 r/min limiting value is .82 of the 1,700 r/min oil value; heavy 60 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Fit the cylindrical-bore 23944EMD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 220 mm bore 23944EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 23944EMD1 by envelope alone: the 1260 kN C0 and 79.4 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Oil relubrication toward 1,700 r/min needs drain and level design; flooding the 60 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The cylindrical-bore 23944EMD1 and its tapered-bore counterpart 23944EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The cylindrical-bore 23944EMD1 and its tapered-bore counterpart 23944EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 789/1260 kN ratings, 79.4 kN Pu and 12500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23944EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23944EMD1?",
        "a": "23944EMD1 is an NTN double-row spherical roller bearing to ISO 15: 220 mm bore, 300 mm OD and 60 mm width (8.661 × 11.811 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 789 kN, C0 1260 kN, Pu 79.4 kN, grease limiting speed 1,400 r/min, oil 1,700 r/min, mass about 12500 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23944EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23944EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23944EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23944EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23944EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23944EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 789 kN C / 1260 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23944EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23944EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23944emd1",
      "＊23944emd1",
      "23944EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23944EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23944EMKD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 220,
    "D_mm": 300,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 789,
    "static_load_kN": 1260,
    "fatigue_load_limit_kN": 79.4,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1700,
    "weight_g": 12100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 220 mm shaft, NTN supplies 23944EMKD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,700 r/min. Reading the full code: the number gives the 220×300 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. At 789 kN C and 12100 g mass the 23900 series part is built for shock and vibration; the 60 mm-wide ring needs square abutments to keep both rows equally loaded. Speed planning: 1,400 r/min grease limiting speed is the cage/kinematic ceiling and 1,700 r/min is the oil-lubricated value for the 220 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Never mount 23944EMKD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 300 mm race.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 220 mm bore 23944EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 60 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 220 mm bearing, and drive-up procedures differ.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,400 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,400 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 789/1260 kN ratings, 79.4 kN Pu and 12100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23944EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23944EMKD1?",
        "a": "23944EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 220 mm bore, 300 mm OD and 60 mm width (8.661 × 11.811 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 789 kN, C0 1260 kN, Pu 79.4 kN, grease limiting speed 1,400 r/min, oil 1,700 r/min, mass about 12100 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23944EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23944EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23944EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23944EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23944EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23944EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 789 kN C / 1260 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23944EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23944EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23944emkd1",
      "＊23944emkd1",
      "23944EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23044EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23044EMD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 220,
    "D_mm": 340,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1530,
    "static_load_kN": 2110,
    "fatigue_load_limit_kN": 109,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1600,
    "weight_g": 29900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23044EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 220 mm shaft — 1530 kN basic dynamic capacity in a 29900 g, open ISO 15 envelope. Reading the full code: the number gives the 220×340 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. The 60.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 90 mm-wide ring seats fully on both sides. Fit the cylindrical-bore 23044EMD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 220 mm bore 23044EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,300 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1530 kN rating no longer applies.",
      "The cylindrical-bore 23044EMD1 and its tapered-bore counterpart 23044EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Never substitute 23044EMD1 by envelope alone: the 2110 kN C0 and 109 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 1530/2110 kN ratings, 109 kN Pu and 29900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23044EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23044EMD1?",
        "a": "23044EMD1 is an NTN double-row spherical roller bearing to ISO 15: 220 mm bore, 340 mm OD and 90 mm width (8.661 × 13.386 × 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1530 kN, C0 2110 kN, Pu 109 kN, grease limiting speed 1,300 r/min, oil 1,600 r/min, mass about 29900 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23044EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23044EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23044EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23044EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23044EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23044EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1530 kN C / 2110 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23044EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23044EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23044emd1",
      "＊23044emd1",
      "23044EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23044EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23044EMKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 220,
    "D_mm": 340,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1530,
    "static_load_kN": 2110,
    "fatigue_load_limit_kN": 109,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1600,
    "weight_g": 29100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23044EMKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 220 mm bore, 340 mm OD, 90 mm width, rated 1,300 r/min on grease. Reading the full code: the number gives the 220×340 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. NTN prints two speeds for 23044EMKD1: 1,300 r/min grease and 1,600 r/min oil — the gap of 300 r/min reflects oil cooling of the heavy roller set. Pu 109 kN against C0 2110 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23044EMKD1 moves with cleanliness far more than with small C variations. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 220 mm set.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 220 mm bore 23044EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 23044EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 220×340 mm envelope is identical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 220 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23044EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Oil relubrication toward 1,600 r/min needs drain and level design; flooding the 90 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 1530/2110 kN ratings, 109 kN Pu and 29100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23044EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23044EMKD1?",
        "a": "23044EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 220 mm bore, 340 mm OD and 90 mm width (8.661 × 13.386 × 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1530 kN, C0 2110 kN, Pu 109 kN, grease limiting speed 1,300 r/min, oil 1,600 r/min, mass about 29100 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23044EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23044EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23044EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23044EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23044EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23044EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1530 kN C / 2110 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23044EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23044EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23044emkd1",
      "＊23044emkd1",
      "23044EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24044EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24044EMD1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 220,
    "D_mm": 340,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1850,
    "static_load_kN": 2720,
    "fatigue_load_limit_kN": 106,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1400,
    "weight_g": 39200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 24044EMD1 identifies a 220×340×118 mm (8.661 × 13.386 × 4.646 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 24044EMD1 is assembled exactly in that order. At 1850 kN C and 39200 g mass the 24000 series part is built for shock and vibration; the 118 mm-wide ring needs square abutments to keep both rows equally loaded. Grease/oil ratio: the 1,100 r/min limiting value is .79 of the 1,400 r/min oil value; heavy 118 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 24044EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 220 mm bore 24044EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 118 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The cylindrical-bore 24044EMD1 and its tapered-bore counterpart 24044EMK30D1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Oil relubrication toward 1,400 r/min needs drain and level design; flooding the 118 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,100 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1850/2720 kN ratings, 106 kN Pu and 39200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24044EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24044EMD1?",
        "a": "24044EMD1 is an NTN double-row spherical roller bearing to ISO 15: 220 mm bore, 340 mm OD and 118 mm width (8.661 × 13.386 × 4.646 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1850 kN, C0 2720 kN, Pu 106 kN, grease limiting speed 1,100 r/min, oil 1,400 r/min, mass about 39200 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24044EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24044EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24044EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24044EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24044EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24044EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1850 kN C / 2720 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24044EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24044EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24044emd1",
      "＊24044emd1",
      "24044EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24044EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24044EMK30D1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 220,
    "D_mm": 340,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1850,
    "static_load_kN": 2720,
    "fatigue_load_limit_kN": 106,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1400,
    "weight_g": 38600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 220 mm shaft, NTN supplies 24044EMK30D1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,400 r/min. Reading the full code: the number gives the 220×340 mm envelope, EM names the cage/capacity execution, K30 marks the 1:30 tapered bore for sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. The 60.0 mm radial section over the 220 mm bore carries two roller rows; capacity per millimetre of bore is about 8.4 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. The 60.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 118 mm-wide ring seats fully on both sides. Never mount 24044EMK30D1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 340 mm race.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 220 mm bore 24044EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24044EMK30D1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24044EMK30D1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24044EMK30D1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 24044EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 1850/2720 kN ratings, 106 kN Pu and 38600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24044EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24044EMK30D1?",
        "a": "24044EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 220 mm bore, 340 mm OD and 118 mm width (8.661 × 13.386 × 4.646 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1850 kN, C0 2720 kN, Pu 106 kN, grease limiting speed 1,100 r/min, oil 1,400 r/min, mass about 38600 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 24044EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 220 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24044EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24044EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24044EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24044EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24044EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1850 kN C / 2720 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24044EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24044EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24044emk30d1",
      "＊24044emk30d1",
      "24044EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23144EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23144EMD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 220,
    "D_mm": 370,
    "B_mm": 120,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2190,
    "static_load_kN": 2940,
    "fatigue_load_limit_kN": 128,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1300,
    "weight_g": 52300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23144EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 220 mm bore, 370 mm OD, 120 mm width, rated 1,000 r/min on grease. Numbering ties 23144EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 220 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Two symmetric roller rows share the load: C 2190 kN, C0 2940 kN (C0/C ≈ 1.34), with useful axial capacity in either direction alongside the dominant radial load. Speed planning: 1,000 r/min grease limiting speed is the cage/kinematic ceiling and 1,300 r/min is the oil-lubricated value for the 220 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 220 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 220 mm bore 23144EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 23144EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 220×370 mm envelope is identical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 220 mm bearing, and drive-up procedures differ.",
      "Do not confuse EA and EM at the same number: 23144EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 220×370 mm envelope is identical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 220 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 2190/2940 kN ratings, 128 kN Pu and 52300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23144EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23144EMD1?",
        "a": "23144EMD1 is an NTN double-row spherical roller bearing to ISO 15: 220 mm bore, 370 mm OD and 120 mm width (8.661 × 14.567 × 4.724 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2190 kN, C0 2940 kN, Pu 128 kN, grease limiting speed 1,000 r/min, oil 1,300 r/min, mass about 52300 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23144EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23144EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23144EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23144EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23144EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23144EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2190 kN C / 2940 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23144EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23144EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23144emd1",
      "＊23144emd1",
      "23144EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23144EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23144EMKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 220,
    "D_mm": 370,
    "B_mm": 120,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2190,
    "static_load_kN": 2940,
    "fatigue_load_limit_kN": 128,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1300,
    "weight_g": 50700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 220 mm shaft, NTN supplies 23144EMKD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,300 r/min. Numbering ties 23144EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 220 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The 75.0 mm radial section over the 220 mm bore carries two roller rows; capacity per millimetre of bore is about 10.0 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Pu 128 kN against C0 2940 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23144EMKD1 moves with cleanliness far more than with small C variations. Fillet radii on shaft and housing must clear the ring chamfers of the 120 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 220 mm bore 23144EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 120 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 23144EMKD1 by envelope alone: the 2940 kN C0 and 128 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Oil relubrication toward 1,300 r/min needs drain and level design; flooding the 120 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23144EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 2190/2940 kN ratings, 128 kN Pu and 50700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23144EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23144EMKD1?",
        "a": "23144EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 220 mm bore, 370 mm OD and 120 mm width (8.661 × 14.567 × 4.724 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2190 kN, C0 2940 kN, Pu 128 kN, grease limiting speed 1,000 r/min, oil 1,300 r/min, mass about 50700 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23144EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23144EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23144EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23144EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23144EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23144EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2190 kN C / 2940 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23144EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23144EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23144emkd1",
      "＊23144emkd1",
      "23144EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24144EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24144EMD1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 220,
    "D_mm": 370,
    "B_mm": 150,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2540,
    "static_load_kN": 3620,
    "fatigue_load_limit_kN": 124,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1300,
    "weight_g": 65200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 220 mm shaft, NTN supplies 24144EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,300 r/min. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 220 mm (two-digit code ×5, with the 00–03 exception table), and 370 mm OD / 150 mm width follow the general plan. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. Equivalent-load planning keeps a radial plus moderate axial combination on 24144EMD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Fit the cylindrical-bore 24144EMD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 220 mm bore 24144EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 220 mm bearing, and drive-up procedures differ.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 220 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Do not confuse EA and EM at the same number: 24144EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 220×370 mm envelope is identical.",
      "Never substitute 24144EMD1 by envelope alone: the 3620 kN C0 and 124 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 2540/3620 kN ratings, 124 kN Pu and 65200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24144EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24144EMD1?",
        "a": "24144EMD1 is an NTN double-row spherical roller bearing to ISO 15: 220 mm bore, 370 mm OD and 150 mm width (8.661 × 14.567 × 5.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2540 kN, C0 3620 kN, Pu 124 kN, grease limiting speed 1,000 r/min, oil 1,300 r/min, mass about 65200 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24144EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24144EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24144EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24144EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24144EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24144EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2540 kN C / 3620 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24144EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24144EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24144emd1",
      "＊24144emd1",
      "24144EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24144EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24144EMK30D1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 220,
    "D_mm": 370,
    "B_mm": 150,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2540,
    "static_load_kN": 3620,
    "fatigue_load_limit_kN": 124,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1300,
    "weight_g": 64300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24144EMK30D1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 220 mm shaft — 2540 kN basic dynamic capacity in a 64300 g, open ISO 15 envelope. Numbering ties 24144EMK30D1 to its envelope and execution: same-number EA versus EM or plain variants share the 220 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Open by design, 24144EMK30D1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. 220 mm bore is 8.661 in and 370 mm OD is 14.567 in; the ISO 15 envelope swaps between brands, but the 2540/3620 kN ratings and cage design are NTN 2203E values. Mount 24144EMK30D1 on its adapter or withdrawal sleeve on the 220 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 220 mm bore 24144EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 2540 kN rating no longer applies.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24144EMK30D1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Do not confuse EA and EM at the same number: 24144EMK30D1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 220×370 mm envelope is identical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 2540 kN rating no longer applies.",
      "The 2540/3620 kN ratings, 124 kN Pu and 64300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24144EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24144EMK30D1?",
        "a": "24144EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 220 mm bore, 370 mm OD and 150 mm width (8.661 × 14.567 × 5.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2540 kN, C0 3620 kN, Pu 124 kN, grease limiting speed 1,000 r/min, oil 1,300 r/min, mass about 64300 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24144EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 220 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24144EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24144EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24144EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24144EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24144EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2540 kN C / 3620 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24144EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24144EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24144emk30d1",
      "＊24144emk30d1",
      "24144EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22244EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22244EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 220,
    "D_mm": 400,
    "B_mm": 108,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2210,
    "static_load_kN": 2690,
    "fatigue_load_limit_kN": 149,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1500,
    "weight_g": 59600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 22244EMD1 denotes the 220 mm bore spherical roller bearing (2210 kN C / 2690 kN C0) in the 22200 series, the self-aligning choice for heavy combined load. Numbering ties 22244EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 220 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. Catalogue mass 59600 g (59.60 kg) for the 220×400×108 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22244EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 220 mm bore 22244EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 22244EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 220×400 mm envelope is identical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22244EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22244EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Never substitute 22244EMD1 by envelope alone: the 2690 kN C0 and 149 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 2210/2690 kN ratings, 149 kN Pu and 59600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22244EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22244EMD1?",
        "a": "22244EMD1 is an NTN double-row spherical roller bearing to ISO 15: 220 mm bore, 400 mm OD and 108 mm width (8.661 × 15.748 × 4.252 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2210 kN, C0 2690 kN, Pu 149 kN, grease limiting speed 1,200 r/min, oil 1,500 r/min, mass about 59600 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22244EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22244EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22244EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22244EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22244EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22244EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2210 kN C / 2690 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22244EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22244EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22244emd1",
      "＊22244emd1",
      "22244EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22244EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22244EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 220,
    "D_mm": 400,
    "B_mm": 108,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2210,
    "static_load_kN": 2690,
    "fatigue_load_limit_kN": 149,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1500,
    "weight_g": 58400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 220 mm shaft, NTN supplies 22244EMKD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,500 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 22244EMKD1 is assembled exactly in that order. The 1:12 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 220 mm bore assembly. Speed planning: 1,200 r/min grease limiting speed is the cage/kinematic ceiling and 1,500 r/min is the oil-lubricated value for the 220 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Fillet radii on shaft and housing must clear the ring chamfers of the 108 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 220 mm bore 22244EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22244EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Do not confuse EA and EM at the same number: 22244EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 220×400 mm envelope is identical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 220 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Do not confuse EA and EM at the same number: 22244EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 220×400 mm envelope is identical.",
      "The 2210/2690 kN ratings, 149 kN Pu and 58400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22244EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22244EMKD1?",
        "a": "22244EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 220 mm bore, 400 mm OD and 108 mm width (8.661 × 15.748 × 4.252 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2210 kN, C0 2690 kN, Pu 149 kN, grease limiting speed 1,200 r/min, oil 1,500 r/min, mass about 58400 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22244EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22244EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22244EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22244EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22244EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22244EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2210 kN C / 2690 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22244EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22244EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22244emkd1",
      "＊22244emkd1",
      "22244EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23244EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23244EMD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 220,
    "D_mm": 400,
    "B_mm": 144,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2890,
    "static_load_kN": 3830,
    "fatigue_load_limit_kN": 147,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1200,
    "weight_g": 79400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23244EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 220 mm shaft — 2890 kN basic dynamic capacity in a 79400 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 220 mm bore; the 144 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. At 2890 kN C and 79400 g mass the 23200 series part is built for shock and vibration; the 144 mm-wide ring needs square abutments to keep both rows equally loaded. Catalogue mass 79400 g (79.40 kg) for the 220×400×144 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 220 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 220 mm bore 23244EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 144 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 2890 kN rating no longer applies.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 220 mm bearing, and drive-up procedures differ.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,000 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 2890/3830 kN ratings, 147 kN Pu and 79400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23244EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23244EMD1?",
        "a": "23244EMD1 is an NTN double-row spherical roller bearing to ISO 15: 220 mm bore, 400 mm OD and 144 mm width (8.661 × 15.748 × 5.669 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2890 kN, C0 3830 kN, Pu 147 kN, grease limiting speed 1,000 r/min, oil 1,200 r/min, mass about 79400 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23244EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23244EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23244EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23244EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23244EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23244EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2890 kN C / 3830 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23244EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23244EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23244emd1",
      "＊23244emd1",
      "23244EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23244EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23244EMKD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 220,
    "D_mm": 400,
    "B_mm": 144,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2890,
    "static_load_kN": 3830,
    "fatigue_load_limit_kN": 147,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1200,
    "weight_g": 77100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23244EMKD1 belongs to the 23200 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. Digit by digit the code reads as spherical-roller dimension series plus 220 mm bore; the 144 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Suffix reading on 23244EMKD1: EM identifies the high-capacity execution with a one-piece machined brass cage; K marks the 1:12 tapered bore; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. Speed planning: 1,000 r/min grease limiting speed is the cage/kinematic ceiling and 1,200 r/min is the oil-lubricated value for the 220 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Never mount 23244EMKD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 400 mm race.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 220 mm bore 23244EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 220 mm bearing, and drive-up procedures differ.",
      "Do not confuse EA and EM at the same number: 23244EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 220×400 mm envelope is identical.",
      "Oil relubrication toward 1,200 r/min needs drain and level design; flooding the 144 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 144 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 2890/3830 kN ratings, 147 kN Pu and 77100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23244EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23244EMKD1?",
        "a": "23244EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 220 mm bore, 400 mm OD and 144 mm width (8.661 × 15.748 × 5.669 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2890 kN, C0 3830 kN, Pu 147 kN, grease limiting speed 1,000 r/min, oil 1,200 r/min, mass about 77100 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23244EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23244EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23244EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23244EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23244EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23244EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2890 kN C / 3830 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23244EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23244EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23244emkd1",
      "＊23244emkd1",
      "23244EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22344EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22344EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 220,
    "D_mm": 460,
    "B_mm": 145,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3010,
    "static_load_kN": 3560,
    "fatigue_load_limit_kN": 163,
    "limiting_speed_rpm": 850,
    "max_rpm": 850,
    "speed_oil_rpm": 1090,
    "weight_g": 119000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22344EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 220 mm bore, 460 mm OD, 145 mm width, rated 850 r/min on grease. Digit by digit the code reads as spherical-roller dimension series plus 220 mm bore; the 145 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. 220 mm bore is 8.661 in and 460 mm OD is 18.11 in; the ISO 15 envelope swaps between brands, but the 3010/3560 kN ratings and cage design are NTN 2203E values. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22344EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 220 mm bore 22344EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 145 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Oil relubrication toward 1,090 r/min needs drain and level design; flooding the 145 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 3010 kN rating no longer applies.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 220 mm bearing, and drive-up procedures differ.",
      "The 3010/3560 kN ratings, 163 kN Pu and 119000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22344EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22344EMD1?",
        "a": "22344EMD1 is an NTN double-row spherical roller bearing to ISO 15: 220 mm bore, 460 mm OD and 145 mm width (8.661 × 18.11 × 5.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3010 kN, C0 3560 kN, Pu 163 kN, grease limiting speed 850 r/min, oil 1,090 r/min, mass about 119000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22344EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22344EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22344EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22344EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22344EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22344EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3010 kN C / 3560 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22344EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22344EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22344emd1",
      "＊22344emd1",
      "22344EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22344EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22344EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 220,
    "D_mm": 460,
    "B_mm": 145,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3010,
    "static_load_kN": 3560,
    "fatigue_load_limit_kN": 163,
    "limiting_speed_rpm": 850,
    "max_rpm": 850,
    "speed_oil_rpm": 1090,
    "weight_g": 116000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22344EMKD1 belongs to the 22300 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. Numbering ties 22344EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 220 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. The 120.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 145 mm-wide ring seats fully on both sides. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 220 mm bore 22344EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 3010 kN rating no longer applies.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22344EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22344EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 220 mm bearing, and drive-up procedures differ.",
      "The 3010/3560 kN ratings, 163 kN Pu and 116000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22344EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22344EMKD1?",
        "a": "22344EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 220 mm bore, 460 mm OD and 145 mm width (8.661 × 18.11 × 5.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3010 kN, C0 3560 kN, Pu 163 kN, grease limiting speed 850 r/min, oil 1,090 r/min, mass about 116000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22344EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22344EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22344EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22344EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22344EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22344EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3010 kN C / 3560 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22344EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22344EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22344emkd1",
      "＊22344emkd1",
      "22344EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23948EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23948EMD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 240,
    "D_mm": 320,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 815,
    "static_load_kN": 1350,
    "fatigue_load_limit_kN": 87.7,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1600,
    "weight_g": 13500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23948EMD1 belongs to the 23900 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 240 mm (two-digit code ×5, with the 00–03 exception table), and 320 mm OD / 60 mm width follow the general plan. Two symmetric roller rows share the load: C 815 kN, C0 1350 kN (C0/C ≈ 1.66), with useful axial capacity in either direction alongside the dominant radial load. With about 3.4 kN of C per millimetre of the 240 mm bore, 23948EMD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 240 mm set.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 240 mm bore 23948EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23948EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23948EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Oil relubrication toward 1,600 r/min needs drain and level design; flooding the 60 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 240 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 815/1350 kN ratings, 87.7 kN Pu and 13500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23948EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23948EMD1?",
        "a": "23948EMD1 is an NTN double-row spherical roller bearing to ISO 15: 240 mm bore, 320 mm OD and 60 mm width (9.449 × 12.598 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 815 kN, C0 1350 kN, Pu 87.7 kN, grease limiting speed 1,300 r/min, oil 1,600 r/min, mass about 13500 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23948EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23948EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23948EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23948EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23948EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23948EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 815 kN C / 1350 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23948EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23948EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23948emd1",
      "＊23948emd1",
      "23948EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23948EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23948EMKD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 240,
    "D_mm": 320,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 815,
    "static_load_kN": 1350,
    "fatigue_load_limit_kN": 87.7,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1600,
    "weight_g": 13100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23948EMKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 240 mm bore, 320 mm OD, 60 mm width, rated 1,300 r/min on grease. Reading the full code: the number gives the 240×320 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. NTN prints two speeds for 23948EMKD1: 1,300 r/min grease and 1,600 r/min oil — the gap of 300 r/min reflects oil cooling of the heavy roller set. Equivalent-load planning keeps a radial plus moderate axial combination on 23948EMKD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 240 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 240 mm bore 23948EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 1,600 r/min needs drain and level design; flooding the 60 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 240 mm bearing, and drive-up procedures differ.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23948EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Oil relubrication toward 1,600 r/min needs drain and level design; flooding the 60 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 815/1350 kN ratings, 87.7 kN Pu and 13100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23948EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23948EMKD1?",
        "a": "23948EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 240 mm bore, 320 mm OD and 60 mm width (9.449 × 12.598 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 815 kN, C0 1350 kN, Pu 87.7 kN, grease limiting speed 1,300 r/min, oil 1,600 r/min, mass about 13100 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23948EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23948EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23948EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23948EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23948EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23948EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 815 kN C / 1350 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23948EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23948EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23948emkd1",
      "＊23948emkd1",
      "23948EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23048EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23048EMD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 240,
    "D_mm": 360,
    "B_mm": 92,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1630,
    "static_load_kN": 2350,
    "fatigue_load_limit_kN": 120,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1400,
    "weight_g": 32000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23048EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 240 mm shaft — 1630 kN basic dynamic capacity in a 32000 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 240 mm bore; the 92 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Pu 120 kN is the catalogue fatigue load limit for 23048EMD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. With about 6.8 kN of C per millimetre of the 240 mm bore, 23048EMD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 240 mm set.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 240 mm bore 23048EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1630 kN rating no longer applies.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23048EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Oil relubrication toward 1,400 r/min needs drain and level design; flooding the 92 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23048EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 1630/2350 kN ratings, 120 kN Pu and 32000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23048EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23048EMD1?",
        "a": "23048EMD1 is an NTN double-row spherical roller bearing to ISO 15: 240 mm bore, 360 mm OD and 92 mm width (9.449 × 14.173 × 3.622 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1630 kN, C0 2350 kN, Pu 120 kN, grease limiting speed 1,100 r/min, oil 1,400 r/min, mass about 32000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23048EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23048EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23048EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23048EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23048EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23048EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1630 kN C / 2350 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23048EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23048EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23048emd1",
      "＊23048emd1",
      "23048EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23048EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23048EMKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 240,
    "D_mm": 360,
    "B_mm": 92,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1630,
    "static_load_kN": 2350,
    "fatigue_load_limit_kN": 120,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1400,
    "weight_g": 31700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23048EMKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 240×360×92 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). Reading the full code: the number gives the 240×360 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Selection: the C0/C ratio of 1.44 (2350/1630 kN) reflects the heavy static and shock proportioning of 23048EMKD1; size the equivalent load at the required L10 with shock factor for the application. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 240 mm bore 23048EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1630 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 240 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 92 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23048EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 1630/2350 kN ratings, 120 kN Pu and 31700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23048EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23048EMKD1?",
        "a": "23048EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 240 mm bore, 360 mm OD and 92 mm width (9.449 × 14.173 × 3.622 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1630 kN, C0 2350 kN, Pu 120 kN, grease limiting speed 1,100 r/min, oil 1,400 r/min, mass about 31700 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23048EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23048EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23048EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23048EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23048EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23048EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1630 kN C / 2350 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23048EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23048EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23048emkd1",
      "＊23048emkd1",
      "23048EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24048EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24048EMD1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 240,
    "D_mm": 360,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1940,
    "static_load_kN": 2980,
    "fatigue_load_limit_kN": 116,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1300,
    "weight_g": 42200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 24048EMD1 identifies a 240×360×118 mm (9.449 × 14.173 × 4.646 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 24048EMD1 is assembled exactly in that order. Open by design, 24048EMD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. With about 8.1 kN of C per millimetre of the 240 mm bore, 24048EMD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Fillet radii on shaft and housing must clear the ring chamfers of the 118 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 240 mm bore 24048EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 1,300 r/min needs drain and level design; flooding the 118 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1940 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 240 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1940 kN rating no longer applies.",
      "The 1940/2980 kN ratings, 116 kN Pu and 42200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24048EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24048EMD1?",
        "a": "24048EMD1 is an NTN double-row spherical roller bearing to ISO 15: 240 mm bore, 360 mm OD and 118 mm width (9.449 × 14.173 × 4.646 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1940 kN, C0 2980 kN, Pu 116 kN, grease limiting speed 1,000 r/min, oil 1,300 r/min, mass about 42200 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24048EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24048EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24048EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24048EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24048EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24048EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1940 kN C / 2980 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24048EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24048EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24048emd1",
      "＊24048emd1",
      "24048EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24048EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24048EMK30D1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 240,
    "D_mm": 360,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1940,
    "static_load_kN": 2980,
    "fatigue_load_limit_kN": 116,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1300,
    "weight_g": 41600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 24048EMK30D1 identifies a 240×360×118 mm (9.449 × 14.173 × 4.646 in) spherical roller bearing, 1:30 tapered bore (K30), to the ISO 15 boundary plan. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K30), lubrication feature (D1); 24048EMK30D1 is assembled exactly in that order. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. Pu 116 kN against C0 2980 kN anchors the contamination derating; for dirty mining duty the adjusted life of 24048EMK30D1 moves with cleanliness far more than with small C variations. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 24048EMK30D1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 240 mm bore 24048EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,000 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 240 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Do not confuse EA and EM at the same number: 24048EMK30D1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 240×360 mm envelope is identical.",
      "Never substitute 24048EMK30D1 by envelope alone: the 2980 kN C0 and 116 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 1940/2980 kN ratings, 116 kN Pu and 41600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24048EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24048EMK30D1?",
        "a": "24048EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 240 mm bore, 360 mm OD and 118 mm width (9.449 × 14.173 × 4.646 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1940 kN, C0 2980 kN, Pu 116 kN, grease limiting speed 1,000 r/min, oil 1,300 r/min, mass about 41600 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 24048EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 240 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24048EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24048EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24048EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24048EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24048EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1940 kN C / 2980 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24048EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24048EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24048emk30d1",
      "＊24048emk30d1",
      "24048EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23148EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23148EMD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 240,
    "D_mm": 400,
    "B_mm": 128,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2510,
    "static_load_kN": 3500,
    "fatigue_load_limit_kN": 147,
    "limiting_speed_rpm": 960,
    "max_rpm": 960,
    "speed_oil_rpm": 1200,
    "weight_g": 65100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 240 mm shaft, NTN supplies 23148EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,200 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 23148EMD1 is assembled exactly in that order. The 80.0 mm radial section over the 240 mm bore carries two roller rows; capacity per millimetre of bore is about 10.5 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Grease/oil ratio: the 960 r/min limiting value is .80 of the 1,200 r/min oil value; heavy 128 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 240 mm set.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 240 mm bore 23148EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 1,200 r/min needs drain and level design; flooding the 128 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Oil relubrication toward 1,200 r/min needs drain and level design; flooding the 128 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The cylindrical-bore 23148EMD1 and its tapered-bore counterpart 23148EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The cylindrical-bore 23148EMD1 and its tapered-bore counterpart 23148EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 2510/3500 kN ratings, 147 kN Pu and 65100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23148EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23148EMD1?",
        "a": "23148EMD1 is an NTN double-row spherical roller bearing to ISO 15: 240 mm bore, 400 mm OD and 128 mm width (9.449 × 15.748 × 5.039 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2510 kN, C0 3500 kN, Pu 147 kN, grease limiting speed 960 r/min, oil 1,200 r/min, mass about 65100 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23148EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23148EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23148EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23148EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23148EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23148EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2510 kN C / 3500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23148EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23148EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23148emd1",
      "＊23148emd1",
      "23148EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23148EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23148EMKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 240,
    "D_mm": 400,
    "B_mm": 128,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2510,
    "static_load_kN": 3500,
    "fatigue_load_limit_kN": 147,
    "limiting_speed_rpm": 960,
    "max_rpm": 960,
    "speed_oil_rpm": 1200,
    "weight_g": 63100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23148EMKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 240×400×128 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). Numbering ties 23148EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 240 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The 80.0 mm radial section over the 240 mm bore carries two roller rows; capacity per millimetre of bore is about 10.5 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. The 80.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 128 mm-wide ring seats fully on both sides. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 240 mm bore 23148EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 1,200 r/min needs drain and level design; flooding the 128 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Do not confuse EA and EM at the same number: 23148EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 240×400 mm envelope is identical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 128 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23148EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 2510/3500 kN ratings, 147 kN Pu and 63100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23148EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23148EMKD1?",
        "a": "23148EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 240 mm bore, 400 mm OD and 128 mm width (9.449 × 15.748 × 5.039 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2510 kN, C0 3500 kN, Pu 147 kN, grease limiting speed 960 r/min, oil 1,200 r/min, mass about 63100 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23148EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23148EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23148EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23148EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23148EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23148EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2510 kN C / 3500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23148EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23148EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23148emkd1",
      "＊23148emkd1",
      "23148EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24148EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24148EMD1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 240,
    "D_mm": 400,
    "B_mm": 160,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2910,
    "static_load_kN": 4290,
    "fatigue_load_limit_kN": 142,
    "limiting_speed_rpm": 960,
    "max_rpm": 960,
    "speed_oil_rpm": 1200,
    "weight_g": 81000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24148EMD1 belongs to the 24100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 240 mm (two-digit code ×5, with the 00–03 exception table), and 400 mm OD / 160 mm width follow the general plan. Suffix reading on 24148EMD1: EM identifies the high-capacity execution with a one-piece machined brass cage; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. 240 mm bore is 9.449 in and 400 mm OD is 15.748 in; the ISO 15 envelope swaps between brands, but the 2910/4290 kN ratings and cage design are NTN 2203E values. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 240 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 240 mm bore 24148EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 24148EMD1 by envelope alone: the 4290 kN C0 and 142 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 960 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The cylindrical-bore 24148EMD1 and its tapered-bore counterpart 24148EMK30D1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 160 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 2910/4290 kN ratings, 142 kN Pu and 81000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24148EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24148EMD1?",
        "a": "24148EMD1 is an NTN double-row spherical roller bearing to ISO 15: 240 mm bore, 400 mm OD and 160 mm width (9.449 × 15.748 × 6.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2910 kN, C0 4290 kN, Pu 142 kN, grease limiting speed 960 r/min, oil 1,200 r/min, mass about 81000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24148EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24148EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24148EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24148EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24148EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24148EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2910 kN C / 4290 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24148EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24148EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24148emd1",
      "＊24148emd1",
      "24148EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24148EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24148EMK30D1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 240,
    "D_mm": 400,
    "B_mm": 160,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2910,
    "static_load_kN": 4290,
    "fatigue_load_limit_kN": 142,
    "limiting_speed_rpm": 960,
    "max_rpm": 960,
    "speed_oil_rpm": 1200,
    "weight_g": 79800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 240 mm shaft, NTN supplies 24148EMK30D1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,200 r/min. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 240 mm (two-digit code ×5, with the 00–03 exception table), and 400 mm OD / 160 mm width follow the general plan. Two symmetric roller rows share the load: C 2910 kN, C0 4290 kN (C0/C ≈ 1.47), with useful axial capacity in either direction alongside the dominant radial load. The 80.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 160 mm-wide ring seats fully on both sides. Fillet radii on shaft and housing must clear the ring chamfers of the 160 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 240 mm bore 24148EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 160 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24148EMK30D1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Oil relubrication toward 1,200 r/min needs drain and level design; flooding the 160 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 240 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 2910/4290 kN ratings, 142 kN Pu and 79800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24148EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24148EMK30D1?",
        "a": "24148EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 240 mm bore, 400 mm OD and 160 mm width (9.449 × 15.748 × 6.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2910 kN, C0 4290 kN, Pu 142 kN, grease limiting speed 960 r/min, oil 1,200 r/min, mass about 79800 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24148EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 240 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24148EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24148EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24148EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24148EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24148EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2910 kN C / 4290 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24148EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24148EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24148emk30d1",
      "＊24148emk30d1",
      "24148EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22248EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22248EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 240,
    "D_mm": 440,
    "B_mm": 120,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2470,
    "static_load_kN": 3110,
    "fatigue_load_limit_kN": 159,
    "limiting_speed_rpm": 1060,
    "max_rpm": 1060,
    "speed_oil_rpm": 1350,
    "weight_g": 82600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22248EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 240 mm shaft — 2470 kN basic dynamic capacity in a 82600 g, open ISO 15 envelope. Numbering ties 22248EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 240 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Suffix reading on 22248EMD1: EM identifies the high-capacity execution with a one-piece machined brass cage; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. Speed planning: 1,060 r/min grease limiting speed is the cage/kinematic ceiling and 1,350 r/min is the oil-lubricated value for the 240 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Never mount 22248EMD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 440 mm race.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 240 mm bore 22248EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 2470 kN rating no longer applies.",
      "Never substitute 22248EMD1 by envelope alone: the 3110 kN C0 and 159 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 240 mm bearing, and drive-up procedures differ.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 120 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 2470/3110 kN ratings, 159 kN Pu and 82600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22248EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22248EMD1?",
        "a": "22248EMD1 is an NTN double-row spherical roller bearing to ISO 15: 240 mm bore, 440 mm OD and 120 mm width (9.449 × 17.323 × 4.724 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2470 kN, C0 3110 kN, Pu 159 kN, grease limiting speed 1,060 r/min, oil 1,350 r/min, mass about 82600 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22248EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22248EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22248EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22248EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22248EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22248EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2470 kN C / 3110 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22248EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22248EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22248emd1",
      "＊22248emd1",
      "22248EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22248EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22248EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 240,
    "D_mm": 440,
    "B_mm": 120,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2470,
    "static_load_kN": 3110,
    "fatigue_load_limit_kN": 159,
    "limiting_speed_rpm": 1060,
    "max_rpm": 1060,
    "speed_oil_rpm": 1350,
    "weight_g": 80900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22248EMKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 240 mm bore, 440 mm OD, 120 mm width, rated 1,060 r/min on grease. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 22248EMKD1 is assembled exactly in that order. NTN prints two speeds for 22248EMKD1: 1,060 r/min grease and 1,350 r/min oil — the gap of 290 r/min reflects oil cooling of the heavy roller set. The 100.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 120 mm-wide ring seats fully on both sides. Mount 22248EMKD1 on its adapter or withdrawal sleeve on the 240 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 240 mm bore 22248EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,060 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Do not confuse EA and EM at the same number: 22248EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 240×440 mm envelope is identical.",
      "Never substitute 22248EMKD1 by envelope alone: the 3110 kN C0 and 159 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Oil relubrication toward 1,350 r/min needs drain and level design; flooding the 120 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 2470/3110 kN ratings, 159 kN Pu and 80900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22248EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22248EMKD1?",
        "a": "22248EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 240 mm bore, 440 mm OD and 120 mm width (9.449 × 17.323 × 4.724 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2470 kN, C0 3110 kN, Pu 159 kN, grease limiting speed 1,060 r/min, oil 1,350 r/min, mass about 80900 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22248EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22248EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22248EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22248EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22248EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22248EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2470 kN C / 3110 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22248EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22248EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22248emkd1",
      "＊22248emkd1",
      "22248EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23248EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23248EMD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 240,
    "D_mm": 440,
    "B_mm": 160,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3140,
    "static_load_kN": 4260,
    "fatigue_load_limit_kN": 156,
    "limiting_speed_rpm": 850,
    "max_rpm": 850,
    "speed_oil_rpm": 1090,
    "weight_g": 108000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23248EMD1 identifies a 240×440×160 mm (9.449 × 17.323 × 6.299 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. The leading digits are the ISO 15 dimension series (23200 series); the bore code resolves to 240 mm (two-digit code ×5, with the 00–03 exception table), and 440 mm OD / 160 mm width follow the general plan. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. The 100.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 160 mm-wide ring seats fully on both sides. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 240 mm set.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 240 mm bore 23248EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 23248EMD1 by envelope alone: the 4260 kN C0 and 156 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Do not confuse EA and EM at the same number: 23248EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 240×440 mm envelope is identical.",
      "Do not confuse EA and EM at the same number: 23248EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 240×440 mm envelope is identical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23248EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 3140/4260 kN ratings, 156 kN Pu and 108000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23248EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23248EMD1?",
        "a": "23248EMD1 is an NTN double-row spherical roller bearing to ISO 15: 240 mm bore, 440 mm OD and 160 mm width (9.449 × 17.323 × 6.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3140 kN, C0 4260 kN, Pu 156 kN, grease limiting speed 850 r/min, oil 1,090 r/min, mass about 108000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23248EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23248EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23248EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23248EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23248EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23248EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3140 kN C / 4260 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23248EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23248EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23248emd1",
      "＊23248emd1",
      "23248EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23248EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23248EMKD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 240,
    "D_mm": 440,
    "B_mm": 160,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3140,
    "static_load_kN": 4260,
    "fatigue_load_limit_kN": 156,
    "limiting_speed_rpm": 850,
    "max_rpm": 850,
    "speed_oil_rpm": 1090,
    "weight_g": 105000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23248EMKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 240 mm bore, 440 mm OD, 160 mm width, rated 850 r/min on grease. Digit by digit the code reads as spherical-roller dimension series plus 240 mm bore; the 160 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The 1:12 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 240 mm bore assembly. The 100.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 160 mm-wide ring seats fully on both sides. Mount 23248EMKD1 on its adapter or withdrawal sleeve on the 240 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 240 mm bore 23248EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 23248EMKD1 by envelope alone: the 4260 kN C0 and 156 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23248EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 850 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Do not confuse EA and EM at the same number: 23248EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 240×440 mm envelope is identical.",
      "The 3140/4260 kN ratings, 156 kN Pu and 105000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23248EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23248EMKD1?",
        "a": "23248EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 240 mm bore, 440 mm OD and 160 mm width (9.449 × 17.323 × 6.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3140 kN, C0 4260 kN, Pu 156 kN, grease limiting speed 850 r/min, oil 1,090 r/min, mass about 105000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23248EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23248EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23248EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23248EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23248EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23248EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3140 kN C / 4260 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23248EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23248EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23248emkd1",
      "＊23248emkd1",
      "23248EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22348EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22348EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 240,
    "D_mm": 500,
    "B_mm": 155,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3500,
    "static_load_kN": 4170,
    "fatigue_load_limit_kN": 193,
    "limiting_speed_rpm": 780,
    "max_rpm": 780,
    "speed_oil_rpm": 1000,
    "weight_g": 149000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22348EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 240 mm bore, 500 mm OD, 155 mm width, rated 780 r/min on grease. Digit by digit the code reads as spherical-roller dimension series plus 240 mm bore; the 155 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The 130.0 mm radial section over the 240 mm bore carries two roller rows; capacity per millimetre of bore is about 14.6 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Catalogue mass 149000 g (149.00 kg) for the 240×500×155 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Fillet radii on shaft and housing must clear the ring chamfers of the 155 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 240 mm bore 22348EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 1,000 r/min needs drain and level design; flooding the 155 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22348EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22348EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The cylindrical-bore 22348EMD1 and its tapered-bore counterpart 22348EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 3500/4170 kN ratings, 193 kN Pu and 149000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22348EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22348EMD1?",
        "a": "22348EMD1 is an NTN double-row spherical roller bearing to ISO 15: 240 mm bore, 500 mm OD and 155 mm width (9.449 × 19.685 × 6.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3500 kN, C0 4170 kN, Pu 193 kN, grease limiting speed 780 r/min, oil 1,000 r/min, mass about 149000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22348EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22348EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22348EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22348EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22348EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22348EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3500 kN C / 4170 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22348EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22348EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22348emd1",
      "＊22348emd1",
      "22348EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22348EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22348EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 240,
    "D_mm": 500,
    "B_mm": 155,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3500,
    "static_load_kN": 4170,
    "fatigue_load_limit_kN": 193,
    "limiting_speed_rpm": 780,
    "max_rpm": 780,
    "speed_oil_rpm": 1000,
    "weight_g": 146000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 240 mm shaft, NTN supplies 22348EMKD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,000 r/min. Numbering ties 22348EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 240 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. At 3500 kN C and 146000 g mass the 22300 series part is built for shock and vibration; the 155 mm-wide ring needs square abutments to keep both rows equally loaded. 240 mm bore is 9.449 in and 500 mm OD is 19.685 in; the ISO 15 envelope swaps between brands, but the 3500/4170 kN ratings and cage design are NTN 2203E values. Fillet radii on shaft and housing must clear the ring chamfers of the 155 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 240 mm bore 22348EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 155 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22348EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Never substitute 22348EMKD1 by envelope alone: the 4170 kN C0 and 193 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 780 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 3500/4170 kN ratings, 193 kN Pu and 146000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22348EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22348EMKD1?",
        "a": "22348EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 240 mm bore, 500 mm OD and 155 mm width (9.449 × 19.685 × 6.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3500 kN, C0 4170 kN, Pu 193 kN, grease limiting speed 780 r/min, oil 1,000 r/min, mass about 146000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22348EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22348EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22348EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22348EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22348EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22348EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3500 kN C / 4170 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22348EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22348EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22348emkd1",
      "＊22348emkd1",
      "22348EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23952EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23952EMD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 260,
    "D_mm": 360,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1130,
    "static_load_kN": 1940,
    "fatigue_load_limit_kN": 105,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1400,
    "weight_g": 23900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 260 mm shaft, NTN supplies 23952EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,400 r/min. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 260 mm (two-digit code ×5, with the 00–03 exception table), and 360 mm OD / 75 mm width follow the general plan. At 1130 kN C and 23900 g mass the 23900 series part is built for shock and vibration; the 75 mm-wide ring needs square abutments to keep both rows equally loaded. Grease/oil ratio: the 1,100 r/min limiting value is .79 of the 1,400 r/min oil value; heavy 75 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 260 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 260 mm bore 23952EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 75 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 23952EMD1 by envelope alone: the 1940 kN C0 and 105 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The cylindrical-bore 23952EMD1 and its tapered-bore counterpart 23952EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,100 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1130/1940 kN ratings, 105 kN Pu and 23900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23952EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23952EMD1?",
        "a": "23952EMD1 is an NTN double-row spherical roller bearing to ISO 15: 260 mm bore, 360 mm OD and 75 mm width (10.236 × 14.173 × 2.953 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1130 kN, C0 1940 kN, Pu 105 kN, grease limiting speed 1,100 r/min, oil 1,400 r/min, mass about 23900 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23952EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23952EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23952EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23952EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23952EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23952EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1130 kN C / 1940 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23952EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23952EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23952emd1",
      "＊23952emd1",
      "23952EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23952EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23952EMKD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 260,
    "D_mm": 360,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1130,
    "static_load_kN": 1940,
    "fatigue_load_limit_kN": 105,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1400,
    "weight_g": 23100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23952EMKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 260×360×75 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). Numbering ties 23952EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 260 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. At 1130 kN C and 23100 g mass the 23900 series part is built for shock and vibration; the 75 mm-wide ring needs square abutments to keep both rows equally loaded. With about 4.3 kN of C per millimetre of the 260 mm bore, 23952EMKD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 23952EMKD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 260 mm bore 23952EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,100 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,100 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 260 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,100 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1130/1940 kN ratings, 105 kN Pu and 23100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23952EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23952EMKD1?",
        "a": "23952EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 260 mm bore, 360 mm OD and 75 mm width (10.236 × 14.173 × 2.953 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1130 kN, C0 1940 kN, Pu 105 kN, grease limiting speed 1,100 r/min, oil 1,400 r/min, mass about 23100 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23952EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23952EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23952EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23952EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23952EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23952EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1130 kN C / 1940 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23952EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23952EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23952emkd1",
      "＊23952emkd1",
      "23952EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23052EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23052EMD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 260,
    "D_mm": 400,
    "B_mm": 104,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2060,
    "static_load_kN": 2910,
    "fatigue_load_limit_kN": 144,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1300,
    "weight_g": 47800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23052EMD1 denotes the 260 mm bore spherical roller bearing (2060 kN C / 2910 kN C0) in the 23000 series, the self-aligning choice for heavy combined load. Reading the full code: the number gives the 260×400 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. Selection: the C0/C ratio of 1.41 (2910/2060 kN) reflects the heavy static and shock proportioning of 23052EMD1; size the equivalent load at the required L10 with shock factor for the application. Fillet radii on shaft and housing must clear the ring chamfers of the 104 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 260 mm bore 23052EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23052EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Oil relubrication toward 1,300 r/min needs drain and level design; flooding the 104 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Oil relubrication toward 1,300 r/min needs drain and level design; flooding the 104 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Never substitute 23052EMD1 by envelope alone: the 2910 kN C0 and 144 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 2060/2910 kN ratings, 144 kN Pu and 47800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23052EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23052EMD1?",
        "a": "23052EMD1 is an NTN double-row spherical roller bearing to ISO 15: 260 mm bore, 400 mm OD and 104 mm width (10.236 × 15.748 × 4.094 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2060 kN, C0 2910 kN, Pu 144 kN, grease limiting speed 1,000 r/min, oil 1,300 r/min, mass about 47800 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23052EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23052EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23052EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23052EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23052EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23052EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2060 kN C / 2910 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23052EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23052EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23052emd1",
      "＊23052emd1",
      "23052EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23052EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23052EMKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 260,
    "D_mm": 400,
    "B_mm": 104,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2060,
    "static_load_kN": 2910,
    "fatigue_load_limit_kN": 144,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1300,
    "weight_g": 46300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23052EMKD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 260 mm shaft — 2060 kN basic dynamic capacity in a 46300 g, open ISO 15 envelope. The leading digits are the ISO 15 dimension series (23000 series); the bore code resolves to 260 mm (two-digit code ×5, with the 00–03 exception table), and 400 mm OD / 104 mm width follow the general plan. At 2060 kN C and 46300 g mass the 23000 series part is built for shock and vibration; the 104 mm-wide ring needs square abutments to keep both rows equally loaded. Equivalent-load planning keeps a radial plus moderate axial combination on 23052EMKD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 260 mm set.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 260 mm bore 23052EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 23052EMKD1 by envelope alone: the 2910 kN C0 and 144 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 260 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23052EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,000 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 2060/2910 kN ratings, 144 kN Pu and 46300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23052EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23052EMKD1?",
        "a": "23052EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 260 mm bore, 400 mm OD and 104 mm width (10.236 × 15.748 × 4.094 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2060 kN, C0 2910 kN, Pu 144 kN, grease limiting speed 1,000 r/min, oil 1,300 r/min, mass about 46300 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23052EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23052EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23052EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23052EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23052EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23052EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2060 kN C / 2910 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23052EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23052EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23052emkd1",
      "＊23052emkd1",
      "23052EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24052EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24052EMD1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 260,
    "D_mm": 400,
    "B_mm": 140,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2520,
    "static_load_kN": 3820,
    "fatigue_load_limit_kN": 139,
    "limiting_speed_rpm": 960,
    "max_rpm": 960,
    "speed_oil_rpm": 1200,
    "weight_g": 63600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24052EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 260 mm shaft — 2520 kN basic dynamic capacity in a 63600 g, open ISO 15 envelope. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 24052EMD1 is assembled exactly in that order. The cylindrical bore fits a machined 260 mm shaft seat directly; the same envelope in 24052EMK30D1 (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Grease/oil ratio: the 960 r/min limiting value is .80 of the 1,200 r/min oil value; heavy 140 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Never mount 24052EMD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 400 mm race.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 260 mm bore 24052EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 260 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 960 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Oil relubrication toward 1,200 r/min needs drain and level design; flooding the 140 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Do not confuse EA and EM at the same number: 24052EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 260×400 mm envelope is identical.",
      "The 2520/3820 kN ratings, 139 kN Pu and 63600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24052EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24052EMD1?",
        "a": "24052EMD1 is an NTN double-row spherical roller bearing to ISO 15: 260 mm bore, 400 mm OD and 140 mm width (10.236 × 15.748 × 5.512 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2520 kN, C0 3820 kN, Pu 139 kN, grease limiting speed 960 r/min, oil 1,200 r/min, mass about 63600 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24052EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24052EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24052EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24052EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24052EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24052EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2520 kN C / 3820 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24052EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24052EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24052emd1",
      "＊24052emd1",
      "24052EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24052EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24052EMK30D1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 260,
    "D_mm": 400,
    "B_mm": 140,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2520,
    "static_load_kN": 3820,
    "fatigue_load_limit_kN": 139,
    "limiting_speed_rpm": 960,
    "max_rpm": 960,
    "speed_oil_rpm": 1200,
    "weight_g": 62600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 24052EMK30D1 with a 1:30 tapered bore (K30) and D1 outer-ring annular oil groove with holes: 260 mm bore, 400 mm OD, 140 mm width, rated 960 r/min on grease. Reading the full code: the number gives the 260×400 mm envelope, EM names the cage/capacity execution, K30 marks the 1:30 tapered bore for sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. Two symmetric roller rows share the load: C 2520 kN, C0 3820 kN (C0/C ≈ 1.52), with useful axial capacity in either direction alongside the dominant radial load. Pu 139 kN against C0 3820 kN anchors the contamination derating; for dirty mining duty the adjusted life of 24052EMK30D1 moves with cleanliness far more than with small C variations. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 260 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 260 mm bore 24052EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 960 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 24052EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Never substitute 24052EMK30D1 by envelope alone: the 3820 kN C0 and 139 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 260 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 2520/3820 kN ratings, 139 kN Pu and 62600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24052EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24052EMK30D1?",
        "a": "24052EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 260 mm bore, 400 mm OD and 140 mm width (10.236 × 15.748 × 5.512 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2520 kN, C0 3820 kN, Pu 139 kN, grease limiting speed 960 r/min, oil 1,200 r/min, mass about 62600 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 24052EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 260 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24052EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24052EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24052EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24052EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24052EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2520 kN C / 3820 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24052EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24052EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24052emk30d1",
      "＊24052emk30d1",
      "24052EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23152EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23152EMD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 260,
    "D_mm": 440,
    "B_mm": 144,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2780,
    "static_load_kN": 4020,
    "fatigue_load_limit_kN": 160,
    "limiting_speed_rpm": 860,
    "max_rpm": 860,
    "speed_oil_rpm": 1090,
    "weight_g": 92200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23152EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 260 mm bore, 440 mm OD, 144 mm width, rated 860 r/min on grease. Numbering ties 23152EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 260 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Speed planning: 860 r/min grease limiting speed is the cage/kinematic ceiling and 1,090 r/min is the oil-lubricated value for the 260 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 260 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 260 mm bore 23152EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23152EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Do not confuse EA and EM at the same number: 23152EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 260×440 mm envelope is identical.",
      "Do not confuse EA and EM at the same number: 23152EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 260×440 mm envelope is identical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23152EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 2780/4020 kN ratings, 160 kN Pu and 92200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23152EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23152EMD1?",
        "a": "23152EMD1 is an NTN double-row spherical roller bearing to ISO 15: 260 mm bore, 440 mm OD and 144 mm width (10.236 × 17.323 × 5.669 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2780 kN, C0 4020 kN, Pu 160 kN, grease limiting speed 860 r/min, oil 1,090 r/min, mass about 92200 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23152EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23152EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23152EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23152EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23152EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23152EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2780 kN C / 4020 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23152EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23152EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23152emd1",
      "＊23152emd1",
      "23152EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23152EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23152EMKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 260,
    "D_mm": 440,
    "B_mm": 144,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2780,
    "static_load_kN": 4020,
    "fatigue_load_limit_kN": 160,
    "limiting_speed_rpm": 860,
    "max_rpm": 860,
    "speed_oil_rpm": 1090,
    "weight_g": 89500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23152EMKD1 identifies a 260×440×144 mm (10.236 × 17.323 × 5.669 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 260 mm bore; the 144 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Suffix reading on 23152EMKD1: EM identifies the high-capacity execution with a one-piece machined brass cage; K marks the 1:12 tapered bore; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. 260 mm bore is 10.236 in and 440 mm OD is 17.323 in; the ISO 15 envelope swaps between brands, but the 2780/4020 kN ratings and cage design are NTN 2203E values. Fillet radii on shaft and housing must clear the ring chamfers of the 144 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 260 mm bore 23152EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 860 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Never substitute 23152EMKD1 by envelope alone: the 4020 kN C0 and 160 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 260 mm bearing, and drive-up procedures differ.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 144 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 2780/4020 kN ratings, 160 kN Pu and 89500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23152EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23152EMKD1?",
        "a": "23152EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 260 mm bore, 440 mm OD and 144 mm width (10.236 × 17.323 × 5.669 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2780 kN, C0 4020 kN, Pu 160 kN, grease limiting speed 860 r/min, oil 1,090 r/min, mass about 89500 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23152EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23152EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23152EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23152EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23152EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23152EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2780 kN C / 4020 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23152EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23152EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23152emkd1",
      "＊23152emkd1",
      "23152EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24152EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24152EMD1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 260,
    "D_mm": 440,
    "B_mm": 180,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3290,
    "static_load_kN": 4880,
    "fatigue_load_limit_kN": 147,
    "limiting_speed_rpm": 850,
    "max_rpm": 850,
    "speed_oil_rpm": 1090,
    "weight_g": 111000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 260 mm shaft, NTN supplies 24152EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,090 r/min. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 260 mm (two-digit code ×5, with the 00–03 exception table), and 440 mm OD / 180 mm width follow the general plan. Two symmetric roller rows share the load: C 3290 kN, C0 4880 kN (C0/C ≈ 1.48), with useful axial capacity in either direction alongside the dominant radial load. The 90.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 180 mm-wide ring seats fully on both sides. Never mount 24152EMD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 440 mm race.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 260 mm bore 24152EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 3290 kN rating no longer applies.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24152EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The cylindrical-bore 24152EMD1 and its tapered-bore counterpart 24152EMK30D1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 260 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 3290/4880 kN ratings, 147 kN Pu and 111000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24152EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24152EMD1?",
        "a": "24152EMD1 is an NTN double-row spherical roller bearing to ISO 15: 260 mm bore, 440 mm OD and 180 mm width (10.236 × 17.323 × 7.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3290 kN, C0 4880 kN, Pu 147 kN, grease limiting speed 850 r/min, oil 1,090 r/min, mass about 111000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24152EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24152EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24152EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24152EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24152EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24152EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3290 kN C / 4880 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24152EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24152EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24152emd1",
      "＊24152emd1",
      "24152EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24152EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24152EMK30D1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 260,
    "D_mm": 440,
    "B_mm": 180,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3290,
    "static_load_kN": 4880,
    "fatigue_load_limit_kN": 147,
    "limiting_speed_rpm": 850,
    "max_rpm": 850,
    "speed_oil_rpm": 1090,
    "weight_g": 109000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 24152EMK30D1 denotes the 260 mm bore spherical roller bearing (3290 kN C / 4880 kN C0) in the 24100 series, the self-aligning choice for heavy combined load. Numbering ties 24152EMK30D1 to its envelope and execution: same-number EA versus EM or plain variants share the 260 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. The 90.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 180 mm-wide ring seats fully on both sides. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 260 mm bore 24152EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 180 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 24152EMK30D1 by envelope alone: the 4880 kN C0 and 147 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24152EMK30D1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 260 mm bearing, and drive-up procedures differ.",
      "The 3290/4880 kN ratings, 147 kN Pu and 109000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24152EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24152EMK30D1?",
        "a": "24152EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 260 mm bore, 440 mm OD and 180 mm width (10.236 × 17.323 × 7.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3290 kN, C0 4880 kN, Pu 147 kN, grease limiting speed 850 r/min, oil 1,090 r/min, mass about 109000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24152EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 260 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24152EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24152EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24152EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24152EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24152EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3290 kN C / 4880 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24152EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24152EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24152emk30d1",
      "＊24152emk30d1",
      "24152EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22252EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22252EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 260,
    "D_mm": 480,
    "B_mm": 130,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2890,
    "static_load_kN": 3680,
    "fatigue_load_limit_kN": 183,
    "limiting_speed_rpm": 970,
    "max_rpm": 970,
    "speed_oil_rpm": 1240,
    "weight_g": 108000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 22252EMD1 denotes the 260 mm bore spherical roller bearing (2890 kN C / 3680 kN C0) in the 22200 series, the self-aligning choice for heavy combined load. Numbering ties 22252EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 260 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Two symmetric roller rows share the load: C 2890 kN, C0 3680 kN (C0/C ≈ 1.27), with useful axial capacity in either direction alongside the dominant radial load. With about 11.1 kN of C per millimetre of the 260 mm bore, 22252EMD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 260 mm set.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 260 mm bore 22252EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22252EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 130 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 260 mm bearing, and drive-up procedures differ.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 260 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 2890/3680 kN ratings, 183 kN Pu and 108000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22252EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22252EMD1?",
        "a": "22252EMD1 is an NTN double-row spherical roller bearing to ISO 15: 260 mm bore, 480 mm OD and 130 mm width (10.236 × 18.898 × 5.118 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2890 kN, C0 3680 kN, Pu 183 kN, grease limiting speed 970 r/min, oil 1,240 r/min, mass about 108000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22252EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22252EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22252EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22252EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22252EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22252EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2890 kN C / 3680 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22252EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22252EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22252emd1",
      "＊22252emd1",
      "22252EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22252EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22252EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 260,
    "D_mm": 480,
    "B_mm": 130,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2890,
    "static_load_kN": 3680,
    "fatigue_load_limit_kN": 183,
    "limiting_speed_rpm": 970,
    "max_rpm": 970,
    "speed_oil_rpm": 1240,
    "weight_g": 105000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22252EMKD1 identifies a 260×480×130 mm (10.236 × 18.898 × 5.118 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. The leading digits are the ISO 15 dimension series (22200 series); the bore code resolves to 260 mm (two-digit code ×5, with the 00–03 exception table), and 480 mm OD / 130 mm width follow the general plan. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. With about 11.1 kN of C per millimetre of the 260 mm bore, 22252EMKD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Fillet radii on shaft and housing must clear the ring chamfers of the 130 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 260 mm bore 22252EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 260 mm bearing, and drive-up procedures differ.",
      "Do not confuse EA and EM at the same number: 22252EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 260×480 mm envelope is identical.",
      "Do not confuse EA and EM at the same number: 22252EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 260×480 mm envelope is identical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22252EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 2890/3680 kN ratings, 183 kN Pu and 105000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22252EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22252EMKD1?",
        "a": "22252EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 260 mm bore, 480 mm OD and 130 mm width (10.236 × 18.898 × 5.118 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2890 kN, C0 3680 kN, Pu 183 kN, grease limiting speed 970 r/min, oil 1,240 r/min, mass about 105000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22252EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22252EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22252EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22252EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22252EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22252EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2890 kN C / 3680 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22252EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22252EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22252emkd1",
      "＊22252emkd1",
      "22252EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23252EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23252EMD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 260,
    "D_mm": 480,
    "B_mm": 174,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3650,
    "static_load_kN": 5050,
    "fatigue_load_limit_kN": 180,
    "limiting_speed_rpm": 780,
    "max_rpm": 780,
    "speed_oil_rpm": 1000,
    "weight_g": 143000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23252EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 260 mm shaft — 3650 kN basic dynamic capacity in a 143000 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 260 mm bore; the 174 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. Catalogue mass 143000 g (143.00 kg) for the 260×480×174 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 260 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 260 mm bore 23252EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 260 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23252EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 260 mm bearing, and drive-up procedures differ.",
      "Never substitute 23252EMD1 by envelope alone: the 5050 kN C0 and 180 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 3650/5050 kN ratings, 180 kN Pu and 143000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23252EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23252EMD1?",
        "a": "23252EMD1 is an NTN double-row spherical roller bearing to ISO 15: 260 mm bore, 480 mm OD and 174 mm width (10.236 × 18.898 × 6.85 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3650 kN, C0 5050 kN, Pu 180 kN, grease limiting speed 780 r/min, oil 1,000 r/min, mass about 143000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23252EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23252EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23252EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23252EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23252EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23252EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3650 kN C / 5050 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23252EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23252EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23252emd1",
      "＊23252emd1",
      "23252EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23252EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23252EMKD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 260,
    "D_mm": 480,
    "B_mm": 174,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3650,
    "static_load_kN": 5050,
    "fatigue_load_limit_kN": 180,
    "limiting_speed_rpm": 780,
    "max_rpm": 780,
    "speed_oil_rpm": 1000,
    "weight_g": 139000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23252EMKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 260×480×174 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 23252EMKD1 is assembled exactly in that order. Pu 180 kN is the catalogue fatigue load limit for 23252EMKD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. With about 14.0 kN of C per millimetre of the 260 mm bore, 23252EMKD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Never mount 23252EMKD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 480 mm race.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 260 mm bore 23252EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 23252EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 260×480 mm envelope is identical.",
      "Do not confuse EA and EM at the same number: 23252EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 260×480 mm envelope is identical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 260 mm bearing, and drive-up procedures differ.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23252EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 3650/5050 kN ratings, 180 kN Pu and 139000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23252EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23252EMKD1?",
        "a": "23252EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 260 mm bore, 480 mm OD and 174 mm width (10.236 × 18.898 × 6.85 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3650 kN, C0 5050 kN, Pu 180 kN, grease limiting speed 780 r/min, oil 1,000 r/min, mass about 139000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23252EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23252EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23252EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23252EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23252EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23252EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3650 kN C / 5050 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23252EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23252EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23252emkd1",
      "＊23252emkd1",
      "23252EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22352EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22352EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 260,
    "D_mm": 540,
    "B_mm": 165,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 4020,
    "static_load_kN": 4830,
    "fatigue_load_limit_kN": 221,
    "limiting_speed_rpm": 720,
    "max_rpm": 720,
    "speed_oil_rpm": 920,
    "weight_g": 186000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22352EMD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 260×540×165 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). Digit by digit the code reads as spherical-roller dimension series plus 260 mm bore; the 165 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. 260 mm bore is 10.236 in and 540 mm OD is 21.26 in; the ISO 15 envelope swaps between brands, but the 4020/4830 kN ratings and cage design are NTN 2203E values. Never mount 22352EMD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 540 mm race.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 260 mm bore 22352EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 260 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Never substitute 22352EMD1 by envelope alone: the 4830 kN C0 and 221 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 4020 kN rating no longer applies.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22352EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 4020/4830 kN ratings, 221 kN Pu and 186000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22352EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22352EMD1?",
        "a": "22352EMD1 is an NTN double-row spherical roller bearing to ISO 15: 260 mm bore, 540 mm OD and 165 mm width (10.236 × 21.26 × 6.496 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4020 kN, C0 4830 kN, Pu 221 kN, grease limiting speed 720 r/min, oil 920 r/min, mass about 186000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22352EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22352EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22352EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22352EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22352EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22352EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4020 kN C / 4830 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22352EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22352EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22352emd1",
      "＊22352emd1",
      "22352EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22352EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22352EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 260,
    "D_mm": 540,
    "B_mm": 165,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 4020,
    "static_load_kN": 4830,
    "fatigue_load_limit_kN": 221,
    "limiting_speed_rpm": 720,
    "max_rpm": 720,
    "speed_oil_rpm": 920,
    "weight_g": 183000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22352EMKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 260×540×165 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). Digit by digit the code reads as spherical-roller dimension series plus 260 mm bore; the 165 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Two symmetric roller rows share the load: C 4020 kN, C0 4830 kN (C0/C ≈ 1.20), with useful axial capacity in either direction alongside the dominant radial load. Pu 221 kN against C0 4830 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22352EMKD1 moves with cleanliness far more than with small C variations. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 260 mm bore 22352EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22352EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22352EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22352EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 260 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 4020/4830 kN ratings, 221 kN Pu and 183000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22352EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22352EMKD1?",
        "a": "22352EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 260 mm bore, 540 mm OD and 165 mm width (10.236 × 21.26 × 6.496 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4020 kN, C0 4830 kN, Pu 221 kN, grease limiting speed 720 r/min, oil 920 r/min, mass about 183000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22352EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22352EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22352EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22352EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22352EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22352EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4020 kN C / 4830 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22352EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22352EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22352emkd1",
      "＊22352emkd1",
      "22352EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23956EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23956EMD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 280,
    "D_mm": 380,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1180,
    "static_load_kN": 2050,
    "fatigue_load_limit_kN": 115,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1300,
    "weight_g": 25200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 280 mm shaft, NTN supplies 23956EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,300 r/min. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 280 mm (two-digit code ×5, with the 00–03 exception table), and 380 mm OD / 75 mm width follow the general plan. Open by design, 23956EMD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. With about 4.2 kN of C per millimetre of the 280 mm bore, 23956EMD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 280 mm bore 23956EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 1,300 r/min needs drain and level design; flooding the 75 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 280 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Oil relubrication toward 1,300 r/min needs drain and level design; flooding the 75 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1180 kN rating no longer applies.",
      "The 1180/2050 kN ratings, 115 kN Pu and 25200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23956EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23956EMD1?",
        "a": "23956EMD1 is an NTN double-row spherical roller bearing to ISO 15: 280 mm bore, 380 mm OD and 75 mm width (11.024 × 14.961 × 2.953 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1180 kN, C0 2050 kN, Pu 115 kN, grease limiting speed 1,000 r/min, oil 1,300 r/min, mass about 25200 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23956EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23956EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23956EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23956EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23956EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23956EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1180 kN C / 2050 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23956EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23956EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23956emd1",
      "＊23956emd1",
      "23956EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23956EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23956EMKD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 280,
    "D_mm": 380,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1180,
    "static_load_kN": 2050,
    "fatigue_load_limit_kN": 115,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1300,
    "weight_g": 24400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23956EMKD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 280 mm shaft — 1180 kN basic dynamic capacity in a 24400 g, open ISO 15 envelope. Numbering ties 23956EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 280 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. At 1180 kN C and 24400 g mass the 23900 series part is built for shock and vibration; the 75 mm-wide ring needs square abutments to keep both rows equally loaded. Speed planning: 1,000 r/min grease limiting speed is the cage/kinematic ceiling and 1,300 r/min is the oil-lubricated value for the 280 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 280 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 280 mm bore 23956EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 280 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 280 mm bearing, and drive-up procedures differ.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,000 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,000 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1180/2050 kN ratings, 115 kN Pu and 24400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23956EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23956EMKD1?",
        "a": "23956EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 280 mm bore, 380 mm OD and 75 mm width (11.024 × 14.961 × 2.953 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1180 kN, C0 2050 kN, Pu 115 kN, grease limiting speed 1,000 r/min, oil 1,300 r/min, mass about 24400 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23956EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23956EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23956EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23956EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23956EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23956EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1180 kN C / 2050 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23956EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23956EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23956emkd1",
      "＊23956emkd1",
      "23956EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23056EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23056EMD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 280,
    "D_mm": 420,
    "B_mm": 106,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2170,
    "static_load_kN": 3150,
    "fatigue_load_limit_kN": 155,
    "limiting_speed_rpm": 960,
    "max_rpm": 960,
    "speed_oil_rpm": 1200,
    "weight_g": 51300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23056EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 280 mm shaft — 2170 kN basic dynamic capacity in a 51300 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 280 mm bore; the 106 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Suffix reading on 23056EMD1: EM identifies the high-capacity execution with a one-piece machined brass cage; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. 280 mm bore is 11.024 in and 420 mm OD is 16.535 in; the ISO 15 envelope swaps between brands, but the 2170/3150 kN ratings and cage design are NTN 2203E values. Fit the cylindrical-bore 23056EMD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 280 mm bore 23056EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 960 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 106 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 280 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 106 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 2170/3150 kN ratings, 155 kN Pu and 51300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23056EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23056EMD1?",
        "a": "23056EMD1 is an NTN double-row spherical roller bearing to ISO 15: 280 mm bore, 420 mm OD and 106 mm width (11.024 × 16.535 × 4.173 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2170 kN, C0 3150 kN, Pu 155 kN, grease limiting speed 960 r/min, oil 1,200 r/min, mass about 51300 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23056EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23056EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23056EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23056EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23056EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23056EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2170 kN C / 3150 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23056EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23056EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23056emd1",
      "＊23056emd1",
      "23056EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23056EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23056EMKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 280,
    "D_mm": 420,
    "B_mm": 106,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2170,
    "static_load_kN": 3150,
    "fatigue_load_limit_kN": 155,
    "limiting_speed_rpm": 960,
    "max_rpm": 960,
    "speed_oil_rpm": 1200,
    "weight_g": 49700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23056EMKD1 denotes the 280 mm bore spherical roller bearing (2170 kN C / 3150 kN C0) in the 23000 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (23000 series); the bore code resolves to 280 mm (two-digit code ×5, with the 00–03 exception table), and 420 mm OD / 106 mm width follow the general plan. Open by design, 23056EMKD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. 280 mm bore is 11.024 in and 420 mm OD is 16.535 in; the ISO 15 envelope swaps between brands, but the 2170/3150 kN ratings and cage design are NTN 2203E values. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 280 mm bore 23056EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23056EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 280 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Oil relubrication toward 1,200 r/min needs drain and level design; flooding the 106 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 2170 kN rating no longer applies.",
      "The 2170/3150 kN ratings, 155 kN Pu and 49700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23056EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23056EMKD1?",
        "a": "23056EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 280 mm bore, 420 mm OD and 106 mm width (11.024 × 16.535 × 4.173 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2170 kN, C0 3150 kN, Pu 155 kN, grease limiting speed 960 r/min, oil 1,200 r/min, mass about 49700 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23056EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23056EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23056EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23056EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23056EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23056EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2170 kN C / 3150 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23056EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23056EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23056emkd1",
      "＊23056emkd1",
      "23056EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24056EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24056EMD1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 280,
    "D_mm": 420,
    "B_mm": 140,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2620,
    "static_load_kN": 4060,
    "fatigue_load_limit_kN": 150,
    "limiting_speed_rpm": 880,
    "max_rpm": 880,
    "speed_oil_rpm": 1100,
    "weight_g": 67300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 24056EMD1 identifies a 280×420×140 mm (11.024 × 16.535 × 5.512 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 24056EMD1 is assembled exactly in that order. Pu 150 kN is the catalogue fatigue load limit for 24056EMD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. With about 9.4 kN of C per millimetre of the 280 mm bore, 24056EMD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Fillet radii on shaft and housing must clear the ring chamfers of the 140 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 280 mm bore 24056EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 24056EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 280×420 mm envelope is identical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24056EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 280 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24056EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 2620/4060 kN ratings, 150 kN Pu and 67300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24056EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24056EMD1?",
        "a": "24056EMD1 is an NTN double-row spherical roller bearing to ISO 15: 280 mm bore, 420 mm OD and 140 mm width (11.024 × 16.535 × 5.512 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2620 kN, C0 4060 kN, Pu 150 kN, grease limiting speed 880 r/min, oil 1,100 r/min, mass about 67300 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24056EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24056EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24056EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24056EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24056EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24056EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2620 kN C / 4060 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24056EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24056EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24056emd1",
      "＊24056emd1",
      "24056EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24056EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24056EMK30D1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 280,
    "D_mm": 420,
    "B_mm": 140,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2620,
    "static_load_kN": 4060,
    "fatigue_load_limit_kN": 150,
    "limiting_speed_rpm": 880,
    "max_rpm": 880,
    "speed_oil_rpm": 1100,
    "weight_g": 66300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24056EMK30D1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 280 mm shaft — 2620 kN basic dynamic capacity in a 66300 g, open ISO 15 envelope. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K30), lubrication feature (D1); 24056EMK30D1 is assembled exactly in that order. Pu 150 kN is the catalogue fatigue load limit for 24056EMK30D1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. 280 mm bore is 11.024 in and 420 mm OD is 16.535 in; the ISO 15 envelope swaps between brands, but the 2620/4060 kN ratings and cage design are NTN 2203E values. Mount 24056EMK30D1 on its adapter or withdrawal sleeve on the 280 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 280 mm bore 24056EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 280 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 880 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24056EMK30D1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24056EMK30D1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 2620/4060 kN ratings, 150 kN Pu and 66300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24056EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24056EMK30D1?",
        "a": "24056EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 280 mm bore, 420 mm OD and 140 mm width (11.024 × 16.535 × 5.512 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2620 kN, C0 4060 kN, Pu 150 kN, grease limiting speed 880 r/min, oil 1,100 r/min, mass about 66300 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 24056EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 280 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24056EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24056EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24056EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24056EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24056EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2620 kN C / 4060 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24056EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24056EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24056emk30d1",
      "＊24056emk30d1",
      "24056EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23156EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23156EMD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 280,
    "D_mm": 460,
    "B_mm": 146,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2980,
    "static_load_kN": 4400,
    "fatigue_load_limit_kN": 182,
    "limiting_speed_rpm": 810,
    "max_rpm": 810,
    "speed_oil_rpm": 1030,
    "weight_g": 98400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23156EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 280 mm bore, 460 mm OD, 146 mm width, rated 810 r/min on grease. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 23156EMD1 is assembled exactly in that order. At 2980 kN C and 98400 g mass the 23100 series part is built for shock and vibration; the 146 mm-wide ring needs square abutments to keep both rows equally loaded. Grease/oil ratio: the 810 r/min limiting value is .79 of the 1,030 r/min oil value; heavy 146 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 280 mm bore 23156EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 23156EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 280×460 mm envelope is identical.",
      "Never substitute 23156EMD1 by envelope alone: the 4400 kN C0 and 182 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The cylindrical-bore 23156EMD1 and its tapered-bore counterpart 23156EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 810 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 2980/4400 kN ratings, 182 kN Pu and 98400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23156EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23156EMD1?",
        "a": "23156EMD1 is an NTN double-row spherical roller bearing to ISO 15: 280 mm bore, 460 mm OD and 146 mm width (11.024 × 18.11 × 5.748 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2980 kN, C0 4400 kN, Pu 182 kN, grease limiting speed 810 r/min, oil 1,030 r/min, mass about 98400 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23156EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23156EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23156EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23156EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23156EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23156EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2980 kN C / 4400 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23156EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23156EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23156emd1",
      "＊23156emd1",
      "23156EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23156EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23156EMKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 280,
    "D_mm": 460,
    "B_mm": 146,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2980,
    "static_load_kN": 4400,
    "fatigue_load_limit_kN": 182,
    "limiting_speed_rpm": 810,
    "max_rpm": 810,
    "speed_oil_rpm": 1030,
    "weight_g": 95300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23156EMKD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 280 mm shaft — 2980 kN basic dynamic capacity in a 95300 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 280 mm bore; the 146 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The 90.0 mm radial section over the 280 mm bore carries two roller rows; capacity per millimetre of bore is about 10.6 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Pu 182 kN against C0 4400 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23156EMKD1 moves with cleanliness far more than with small C variations. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 280 mm set.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 280 mm bore 23156EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 280 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Never substitute 23156EMKD1 by envelope alone: the 4400 kN C0 and 182 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Oil relubrication toward 1,030 r/min needs drain and level design; flooding the 146 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23156EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 2980/4400 kN ratings, 182 kN Pu and 95300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23156EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23156EMKD1?",
        "a": "23156EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 280 mm bore, 460 mm OD and 146 mm width (11.024 × 18.11 × 5.748 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2980 kN, C0 4400 kN, Pu 182 kN, grease limiting speed 810 r/min, oil 1,030 r/min, mass about 95300 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23156EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23156EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23156EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23156EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23156EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23156EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2980 kN C / 4400 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23156EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23156EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23156emkd1",
      "＊23156emkd1",
      "23156EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24156EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24156EMD1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 280,
    "D_mm": 460,
    "B_mm": 180,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3550,
    "static_load_kN": 5450,
    "fatigue_load_limit_kN": 167,
    "limiting_speed_rpm": 810,
    "max_rpm": 810,
    "speed_oil_rpm": 1030,
    "weight_g": 118000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 280 mm shaft, NTN supplies 24156EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,030 r/min. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 280 mm (two-digit code ×5, with the 00–03 exception table), and 460 mm OD / 180 mm width follow the general plan. Suffix reading on 24156EMD1: EM identifies the high-capacity execution with a one-piece machined brass cage; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. Grease/oil ratio: the 810 r/min limiting value is .79 of the 1,030 r/min oil value; heavy 180 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Fit the cylindrical-bore 24156EMD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 280 mm bore 24156EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 180 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Do not confuse EA and EM at the same number: 24156EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 280×460 mm envelope is identical.",
      "Oil relubrication toward 1,030 r/min needs drain and level design; flooding the 180 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 180 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 3550/5450 kN ratings, 167 kN Pu and 118000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24156EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24156EMD1?",
        "a": "24156EMD1 is an NTN double-row spherical roller bearing to ISO 15: 280 mm bore, 460 mm OD and 180 mm width (11.024 × 18.11 × 7.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3550 kN, C0 5450 kN, Pu 167 kN, grease limiting speed 810 r/min, oil 1,030 r/min, mass about 118000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24156EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24156EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24156EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24156EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24156EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24156EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3550 kN C / 5450 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24156EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24156EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24156emd1",
      "＊24156emd1",
      "24156EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24156EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24156EMK30D1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 280,
    "D_mm": 460,
    "B_mm": 180,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3550,
    "static_load_kN": 5450,
    "fatigue_load_limit_kN": 167,
    "limiting_speed_rpm": 810,
    "max_rpm": 810,
    "speed_oil_rpm": 1030,
    "weight_g": 117000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24156EMK30D1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 280×460×180 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 280 mm (two-digit code ×5, with the 00–03 exception table), and 460 mm OD / 180 mm width follow the general plan. Pu 167 kN is the catalogue fatigue load limit for 24156EMK30D1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Pu 167 kN against C0 5450 kN anchors the contamination derating; for dirty mining duty the adjusted life of 24156EMK30D1 moves with cleanliness far more than with small C variations. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 280 mm bore 24156EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 1,030 r/min needs drain and level design; flooding the 180 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 180 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Do not confuse EA and EM at the same number: 24156EMK30D1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 280×460 mm envelope is identical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24156EMK30D1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 3550/5450 kN ratings, 167 kN Pu and 117000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24156EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24156EMK30D1?",
        "a": "24156EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 280 mm bore, 460 mm OD and 180 mm width (11.024 × 18.11 × 7.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3550 kN, C0 5450 kN, Pu 167 kN, grease limiting speed 810 r/min, oil 1,030 r/min, mass about 117000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24156EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 280 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24156EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24156EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24156EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24156EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24156EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3550 kN C / 5450 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24156EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24156EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24156emk30d1",
      "＊24156emk30d1",
      "24156EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22256EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22256EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 280,
    "D_mm": 500,
    "B_mm": 130,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3010,
    "static_load_kN": 3920,
    "fatigue_load_limit_kN": 198,
    "limiting_speed_rpm": 920,
    "max_rpm": 920,
    "speed_oil_rpm": 1180,
    "weight_g": 113000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 22256EMD1 denotes the 280 mm bore spherical roller bearing (3010 kN C / 3920 kN C0) in the 22200 series, the self-aligning choice for heavy combined load. Numbering ties 22256EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 280 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Suffix reading on 22256EMD1: EM identifies the high-capacity execution with a one-piece machined brass cage; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. Pu 198 kN against C0 3920 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22256EMD1 moves with cleanliness far more than with small C variations. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22256EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 280 mm bore 22256EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 920 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The cylindrical-bore 22256EMD1 and its tapered-bore counterpart 22256EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Do not confuse EA and EM at the same number: 22256EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 280×500 mm envelope is identical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 130 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 3010/3920 kN ratings, 198 kN Pu and 113000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22256EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22256EMD1?",
        "a": "22256EMD1 is an NTN double-row spherical roller bearing to ISO 15: 280 mm bore, 500 mm OD and 130 mm width (11.024 × 19.685 × 5.118 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3010 kN, C0 3920 kN, Pu 198 kN, grease limiting speed 920 r/min, oil 1,180 r/min, mass about 113000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22256EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22256EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22256EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22256EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22256EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22256EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3010 kN C / 3920 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22256EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22256EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22256emd1",
      "＊22256emd1",
      "22256EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22256EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22256EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 280,
    "D_mm": 500,
    "B_mm": 130,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3010,
    "static_load_kN": 3920,
    "fatigue_load_limit_kN": 198,
    "limiting_speed_rpm": 920,
    "max_rpm": 920,
    "speed_oil_rpm": 1180,
    "weight_g": 111000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22256EMKD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 280 mm shaft — 3010 kN basic dynamic capacity in a 111000 g, open ISO 15 envelope. The leading digits are the ISO 15 dimension series (22200 series); the bore code resolves to 280 mm (two-digit code ×5, with the 00–03 exception table), and 500 mm OD / 130 mm width follow the general plan. At 3010 kN C and 111000 g mass the 22200 series part is built for shock and vibration; the 130 mm-wide ring needs square abutments to keep both rows equally loaded. Pu 198 kN against C0 3920 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22256EMKD1 moves with cleanliness far more than with small C variations. Mount 22256EMKD1 on its adapter or withdrawal sleeve on the 280 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 280 mm bore 22256EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 22256EMKD1 by envelope alone: the 3920 kN C0 and 198 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Do not confuse EA and EM at the same number: 22256EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 280×500 mm envelope is identical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22256EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 920 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 3010/3920 kN ratings, 198 kN Pu and 111000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22256EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22256EMKD1?",
        "a": "22256EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 280 mm bore, 500 mm OD and 130 mm width (11.024 × 19.685 × 5.118 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3010 kN, C0 3920 kN, Pu 198 kN, grease limiting speed 920 r/min, oil 1,180 r/min, mass about 111000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22256EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22256EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22256EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22256EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22256EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22256EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3010 kN C / 3920 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22256EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22256EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22256emkd1",
      "＊22256emkd1",
      "22256EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23256EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23256EMD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 280,
    "D_mm": 500,
    "B_mm": 176,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3770,
    "static_load_kN": 5340,
    "fatigue_load_limit_kN": 193,
    "limiting_speed_rpm": 740,
    "max_rpm": 740,
    "speed_oil_rpm": 950,
    "weight_g": 152000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23256EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 280 mm shaft — 3770 kN basic dynamic capacity in a 152000 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 280 mm bore; the 176 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Pu 193 kN is the catalogue fatigue load limit for 23256EMD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Speed planning: 740 r/min grease limiting speed is the cage/kinematic ceiling and 950 r/min is the oil-lubricated value for the 280 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 280 mm bore 23256EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 23256EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 280×500 mm envelope is identical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 176 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Do not confuse EA and EM at the same number: 23256EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 280×500 mm envelope is identical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23256EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 3770/5340 kN ratings, 193 kN Pu and 152000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23256EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23256EMD1?",
        "a": "23256EMD1 is an NTN double-row spherical roller bearing to ISO 15: 280 mm bore, 500 mm OD and 176 mm width (11.024 × 19.685 × 6.929 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3770 kN, C0 5340 kN, Pu 193 kN, grease limiting speed 740 r/min, oil 950 r/min, mass about 152000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23256EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23256EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23256EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23256EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23256EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23256EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3770 kN C / 5340 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23256EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23256EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23256emd1",
      "＊23256emd1",
      "23256EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23256EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23256EMKD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 280,
    "D_mm": 500,
    "B_mm": 176,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3770,
    "static_load_kN": 5340,
    "fatigue_load_limit_kN": 193,
    "limiting_speed_rpm": 740,
    "max_rpm": 740,
    "speed_oil_rpm": 950,
    "weight_g": 148000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23256EMKD1 identifies a 280×500×176 mm (11.024 × 19.685 × 6.929 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 23256EMKD1 is assembled exactly in that order. The 1:12 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 280 mm bore assembly. Pu 193 kN against C0 5340 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23256EMKD1 moves with cleanliness far more than with small C variations. Fillet radii on shaft and housing must clear the ring chamfers of the 176 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 280 mm bore 23256EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 3770 kN rating no longer applies.",
      "Do not confuse EA and EM at the same number: 23256EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 280×500 mm envelope is identical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 280 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Do not confuse EA and EM at the same number: 23256EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 280×500 mm envelope is identical.",
      "The 3770/5340 kN ratings, 193 kN Pu and 148000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23256EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23256EMKD1?",
        "a": "23256EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 280 mm bore, 500 mm OD and 176 mm width (11.024 × 19.685 × 6.929 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3770 kN, C0 5340 kN, Pu 193 kN, grease limiting speed 740 r/min, oil 950 r/min, mass about 148000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23256EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23256EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23256EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23256EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23256EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23256EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3770 kN C / 5340 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23256EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23256EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23256emkd1",
      "＊23256emkd1",
      "23256EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22356EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22356EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 280,
    "D_mm": 580,
    "B_mm": 175,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 4490,
    "static_load_kN": 5450,
    "fatigue_load_limit_kN": 249,
    "limiting_speed_rpm": 670,
    "max_rpm": 670,
    "speed_oil_rpm": 860,
    "weight_g": 228000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22356EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 280 mm bore, 580 mm OD, 175 mm width, rated 670 r/min on grease. Digit by digit the code reads as spherical-roller dimension series plus 280 mm bore; the 175 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. NTN prints two speeds for 22356EMD1: 670 r/min grease and 860 r/min oil — the gap of 190 r/min reflects oil cooling of the heavy roller set. Catalogue mass 228000 g (228.00 kg) for the 280×580×175 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Fillet radii on shaft and housing must clear the ring chamfers of the 175 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 280 mm bore 22356EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 22356EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 280×580 mm envelope is identical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 280 mm bearing, and drive-up procedures differ.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22356EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Oil relubrication toward 860 r/min needs drain and level design; flooding the 175 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 4490/5450 kN ratings, 249 kN Pu and 228000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22356EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22356EMD1?",
        "a": "22356EMD1 is an NTN double-row spherical roller bearing to ISO 15: 280 mm bore, 580 mm OD and 175 mm width (11.024 × 22.835 × 6.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4490 kN, C0 5450 kN, Pu 249 kN, grease limiting speed 670 r/min, oil 860 r/min, mass about 228000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22356EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22356EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22356EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22356EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22356EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22356EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4490 kN C / 5450 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22356EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22356EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22356emd1",
      "＊22356emd1",
      "22356EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22356EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22356EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 280,
    "D_mm": 580,
    "B_mm": 175,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 4490,
    "static_load_kN": 5450,
    "fatigue_load_limit_kN": 249,
    "limiting_speed_rpm": 670,
    "max_rpm": 670,
    "speed_oil_rpm": 860,
    "weight_g": 223000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22356EMKD1 identifies a 280×580×175 mm (11.024 × 22.835 × 6.89 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 280 mm bore; the 175 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. The 150.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 175 mm-wide ring seats fully on both sides. Fillet radii on shaft and housing must clear the ring chamfers of the 175 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 280 mm bore 22356EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 670 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22356EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22356EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 280 mm bearing, and drive-up procedures differ.",
      "The 4490/5450 kN ratings, 249 kN Pu and 223000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22356EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22356EMKD1?",
        "a": "22356EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 280 mm bore, 580 mm OD and 175 mm width (11.024 × 22.835 × 6.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4490 kN, C0 5450 kN, Pu 249 kN, grease limiting speed 670 r/min, oil 860 r/min, mass about 223000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22356EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22356EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22356EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22356EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22356EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22356EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4490 kN C / 5450 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22356EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22356EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22356emkd1",
      "＊22356emkd1",
      "22356EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23960EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23960EMD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 300,
    "D_mm": 420,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1600,
    "static_load_kN": 2620,
    "fatigue_load_limit_kN": 145,
    "limiting_speed_rpm": 890,
    "max_rpm": 890,
    "speed_oil_rpm": 1140,
    "weight_g": 40100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 300 mm shaft, NTN supplies 23960EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,140 r/min. Digit by digit the code reads as spherical-roller dimension series plus 300 mm bore; the 90 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. NTN prints two speeds for 23960EMD1: 890 r/min grease and 1,140 r/min oil — the gap of 250 r/min reflects oil cooling of the heavy roller set. Selection: the C0/C ratio of 1.64 (2620/1600 kN) reflects the heavy static and shock proportioning of 23960EMD1; size the equivalent load at the required L10 with shock factor for the application. Fillet radii on shaft and housing must clear the ring chamfers of the 90 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 300 mm bore 23960EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23960EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1600 kN rating no longer applies.",
      "Oil relubrication toward 1,140 r/min needs drain and level design; flooding the 90 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Oil relubrication toward 1,140 r/min needs drain and level design; flooding the 90 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 1600/2620 kN ratings, 145 kN Pu and 40100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23960EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23960EMD1?",
        "a": "23960EMD1 is an NTN double-row spherical roller bearing to ISO 15: 300 mm bore, 420 mm OD and 90 mm width (11.811 × 16.535 × 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1600 kN, C0 2620 kN, Pu 145 kN, grease limiting speed 890 r/min, oil 1,140 r/min, mass about 40100 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23960EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23960EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23960EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23960EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23960EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23960EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1600 kN C / 2620 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23960EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23960EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23960emd1",
      "＊23960emd1",
      "23960EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23960EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23960EMKD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 300,
    "D_mm": 420,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1600,
    "static_load_kN": 2620,
    "fatigue_load_limit_kN": 145,
    "limiting_speed_rpm": 890,
    "max_rpm": 890,
    "speed_oil_rpm": 1140,
    "weight_g": 39200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23960EMKD1 denotes the 300 mm bore spherical roller bearing (1600 kN C / 2620 kN C0) in the 23900 series, the self-aligning choice for heavy combined load. Digit by digit the code reads as spherical-roller dimension series plus 300 mm bore; the 90 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Equivalent-load planning keeps a radial plus moderate axial combination on 23960EMKD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 23960EMKD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 300 mm bore 23960EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 23960EMKD1 by envelope alone: the 2620 kN C0 and 145 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 890 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Do not confuse EA and EM at the same number: 23960EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 300×420 mm envelope is identical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 300 mm bearing, and drive-up procedures differ.",
      "The 1600/2620 kN ratings, 145 kN Pu and 39200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23960EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23960EMKD1?",
        "a": "23960EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 300 mm bore, 420 mm OD and 90 mm width (11.811 × 16.535 × 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1600 kN, C0 2620 kN, Pu 145 kN, grease limiting speed 890 r/min, oil 1,140 r/min, mass about 39200 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23960EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23960EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23960EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23960EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23960EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23960EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1600 kN C / 2620 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23960EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23960EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23960emkd1",
      "＊23960emkd1",
      "23960EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23060EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23060EMD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 300,
    "D_mm": 460,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2400,
    "static_load_kN": 3610,
    "fatigue_load_limit_kN": 176,
    "limiting_speed_rpm": 890,
    "max_rpm": 890,
    "speed_oil_rpm": 1130,
    "weight_g": 72900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23060EMD1 denotes the 300 mm bore spherical roller bearing (2400 kN C / 3610 kN C0) in the 23000 series, the self-aligning choice for heavy combined load. Reading the full code: the number gives the 300×460 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. Open by design, 23060EMD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Selection: the C0/C ratio of 1.50 (3610/2400 kN) reflects the heavy static and shock proportioning of 23060EMD1; size the equivalent load at the required L10 with shock factor for the application. Fillet radii on shaft and housing must clear the ring chamfers of the 118 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 300 mm bore 23060EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 1,130 r/min needs drain and level design; flooding the 118 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 300 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Oil relubrication toward 1,130 r/min needs drain and level design; flooding the 118 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 2400 kN rating no longer applies.",
      "The 2400/3610 kN ratings, 176 kN Pu and 72900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23060EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23060EMD1?",
        "a": "23060EMD1 is an NTN double-row spherical roller bearing to ISO 15: 300 mm bore, 460 mm OD and 118 mm width (11.811 × 18.11 × 4.646 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2400 kN, C0 3610 kN, Pu 176 kN, grease limiting speed 890 r/min, oil 1,130 r/min, mass about 72900 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23060EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23060EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23060EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23060EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23060EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23060EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2400 kN C / 3610 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23060EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23060EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23060emd1",
      "＊23060emd1",
      "23060EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23060EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23060EMKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 300,
    "D_mm": 460,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2400,
    "static_load_kN": 3610,
    "fatigue_load_limit_kN": 176,
    "limiting_speed_rpm": 890,
    "max_rpm": 890,
    "speed_oil_rpm": 1130,
    "weight_g": 70900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 300 mm shaft, NTN supplies 23060EMKD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,130 r/min. Reading the full code: the number gives the 300×460 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Speed planning: 890 r/min grease limiting speed is the cage/kinematic ceiling and 1,130 r/min is the oil-lubricated value for the 300 mm bore; vibrating screens rarely approach either and are load/cage limited instead. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 300 mm set.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 300 mm bore 23060EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 2400 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 300 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 890 r/min grease rating is lost to abrasive wear long before fatigue.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 300 mm bearing, and drive-up procedures differ.",
      "The 2400/3610 kN ratings, 176 kN Pu and 70900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23060EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23060EMKD1?",
        "a": "23060EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 300 mm bore, 460 mm OD and 118 mm width (11.811 × 18.11 × 4.646 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2400 kN, C0 3610 kN, Pu 176 kN, grease limiting speed 890 r/min, oil 1,130 r/min, mass about 70900 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23060EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23060EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23060EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23060EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23060EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23060EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2400 kN C / 3610 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23060EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23060EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23060emkd1",
      "＊23060emkd1",
      "23060EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24060EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24060EMD1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 300,
    "D_mm": 460,
    "B_mm": 160,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3150,
    "static_load_kN": 5190,
    "fatigue_load_limit_kN": 166,
    "limiting_speed_rpm": 760,
    "max_rpm": 760,
    "speed_oil_rpm": 970,
    "weight_g": 98000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24060EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 300 mm shaft — 3150 kN basic dynamic capacity in a 98000 g, open ISO 15 envelope. Numbering ties 24060EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 300 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. Selection: the C0/C ratio of 1.65 (5190/3150 kN) reflects the heavy static and shock proportioning of 24060EMD1; size the equivalent load at the required L10 with shock factor for the application. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 300 mm bore 24060EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 24060EMD1 by envelope alone: the 5190 kN C0 and 166 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Never substitute 24060EMD1 by envelope alone: the 5190 kN C0 and 166 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 300 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Never substitute 24060EMD1 by envelope alone: the 5190 kN C0 and 166 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 3150/5190 kN ratings, 166 kN Pu and 98000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24060EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24060EMD1?",
        "a": "24060EMD1 is an NTN double-row spherical roller bearing to ISO 15: 300 mm bore, 460 mm OD and 160 mm width (11.811 × 18.11 × 6.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3150 kN, C0 5190 kN, Pu 166 kN, grease limiting speed 760 r/min, oil 970 r/min, mass about 98000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24060EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24060EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24060EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24060EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24060EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24060EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3150 kN C / 5190 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24060EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24060EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24060emd1",
      "＊24060emd1",
      "24060EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24060EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24060EMK30D1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 300,
    "D_mm": 460,
    "B_mm": 160,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3150,
    "static_load_kN": 5190,
    "fatigue_load_limit_kN": 166,
    "limiting_speed_rpm": 760,
    "max_rpm": 760,
    "speed_oil_rpm": 970,
    "weight_g": 96900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24060EMK30D1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 300×460×160 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). Reading the full code: the number gives the 300×460 mm envelope, EM names the cage/capacity execution, K30 marks the 1:30 tapered bore for sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. Suffix reading on 24060EMK30D1: EM identifies the high-capacity execution with a one-piece machined brass cage; K30 marks the 1:30 tapered bore of the wide series; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. 300 mm bore is 11.811 in and 460 mm OD is 18.11 in; the ISO 15 envelope swaps between brands, but the 3150/5190 kN ratings and cage design are NTN 2203E values. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 24060EMK30D1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 300 mm bore 24060EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 300 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24060EMK30D1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 160 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 160 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 3150/5190 kN ratings, 166 kN Pu and 96900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24060EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24060EMK30D1?",
        "a": "24060EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 300 mm bore, 460 mm OD and 160 mm width (11.811 × 18.11 × 6.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3150 kN, C0 5190 kN, Pu 166 kN, grease limiting speed 760 r/min, oil 970 r/min, mass about 96900 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 24060EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 300 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24060EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24060EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24060EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24060EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24060EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3150 kN C / 5190 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24060EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24060EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24060emk30d1",
      "＊24060emk30d1",
      "24060EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23160EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23160EMD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 300,
    "D_mm": 500,
    "B_mm": 160,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3540,
    "static_load_kN": 5170,
    "fatigue_load_limit_kN": 205,
    "limiting_speed_rpm": 750,
    "max_rpm": 750,
    "speed_oil_rpm": 950,
    "weight_g": 129000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23160EMD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 300×500×160 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). Numbering ties 23160EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 300 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Pu 205 kN against C0 5170 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23160EMD1 moves with cleanliness far more than with small C variations. Fit the cylindrical-bore 23160EMD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 300 mm bore 23160EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 23160EMD1 by envelope alone: the 5170 kN C0 and 205 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 160 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The cylindrical-bore 23160EMD1 and its tapered-bore counterpart 23160EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23160EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 3540/5170 kN ratings, 205 kN Pu and 129000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23160EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23160EMD1?",
        "a": "23160EMD1 is an NTN double-row spherical roller bearing to ISO 15: 300 mm bore, 500 mm OD and 160 mm width (11.811 × 19.685 × 6.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3540 kN, C0 5170 kN, Pu 205 kN, grease limiting speed 750 r/min, oil 950 r/min, mass about 129000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23160EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23160EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23160EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23160EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23160EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23160EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3540 kN C / 5170 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23160EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23160EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23160emd1",
      "＊23160emd1",
      "23160EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23160EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23160EMKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 300,
    "D_mm": 500,
    "B_mm": 160,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3540,
    "static_load_kN": 5170,
    "fatigue_load_limit_kN": 205,
    "limiting_speed_rpm": 750,
    "max_rpm": 750,
    "speed_oil_rpm": 950,
    "weight_g": 125000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23160EMKD1 belongs to the 23100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 23160EMKD1 is assembled exactly in that order. Pu 205 kN is the catalogue fatigue load limit for 23160EMKD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. The 100.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 160 mm-wide ring seats fully on both sides. Fillet radii on shaft and housing must clear the ring chamfers of the 160 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 300 mm bore 23160EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 23160EMKD1 by envelope alone: the 5170 kN C0 and 205 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Never substitute 23160EMKD1 by envelope alone: the 5170 kN C0 and 205 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Never substitute 23160EMKD1 by envelope alone: the 5170 kN C0 and 205 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23160EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 3540/5170 kN ratings, 205 kN Pu and 125000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23160EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23160EMKD1?",
        "a": "23160EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 300 mm bore, 500 mm OD and 160 mm width (11.811 × 19.685 × 6.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3540 kN, C0 5170 kN, Pu 205 kN, grease limiting speed 750 r/min, oil 950 r/min, mass about 125000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23160EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23160EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23160EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23160EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23160EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23160EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3540 kN C / 5170 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23160EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23160EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23160emkd1",
      "＊23160emkd1",
      "23160EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24160EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24160EMD1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 300,
    "D_mm": 500,
    "B_mm": 200,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 4270,
    "static_load_kN": 6610,
    "fatigue_load_limit_kN": 198,
    "limiting_speed_rpm": 750,
    "max_rpm": 750,
    "speed_oil_rpm": 950,
    "weight_g": 159000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 24160EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 300 mm bore, 500 mm OD, 200 mm width, rated 750 r/min on grease. Digit by digit the code reads as spherical-roller dimension series plus 300 mm bore; the 200 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Open by design, 24160EMD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Speed planning: 750 r/min grease limiting speed is the cage/kinematic ceiling and 950 r/min is the oil-lubricated value for the 300 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Fillet radii on shaft and housing must clear the ring chamfers of the 200 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 300 mm bore 24160EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The cylindrical-bore 24160EMD1 and its tapered-bore counterpart 24160EMK30D1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24160EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The cylindrical-bore 24160EMD1 and its tapered-bore counterpart 24160EMK30D1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 4270 kN rating no longer applies.",
      "The 4270/6610 kN ratings, 198 kN Pu and 159000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24160EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24160EMD1?",
        "a": "24160EMD1 is an NTN double-row spherical roller bearing to ISO 15: 300 mm bore, 500 mm OD and 200 mm width (11.811 × 19.685 × 7.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4270 kN, C0 6610 kN, Pu 198 kN, grease limiting speed 750 r/min, oil 950 r/min, mass about 159000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24160EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24160EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24160EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24160EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24160EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24160EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4270 kN C / 6610 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24160EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24160EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24160emd1",
      "＊24160emd1",
      "24160EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24160EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24160EMK30D1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 300,
    "D_mm": 500,
    "B_mm": 200,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 4270,
    "static_load_kN": 6610,
    "fatigue_load_limit_kN": 198,
    "limiting_speed_rpm": 750,
    "max_rpm": 750,
    "speed_oil_rpm": 950,
    "weight_g": 157000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24160EMK30D1 belongs to the 24100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. Numbering ties 24160EMK30D1 to its envelope and execution: same-number EA versus EM or plain variants share the 300 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The 100.0 mm radial section over the 300 mm bore carries two roller rows; capacity per millimetre of bore is about 14.2 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Pu 198 kN against C0 6610 kN anchors the contamination derating; for dirty mining duty the adjusted life of 24160EMK30D1 moves with cleanliness far more than with small C variations. Fillet radii on shaft and housing must clear the ring chamfers of the 200 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 300 mm bore 24160EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 950 r/min needs drain and level design; flooding the 200 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 300 mm bearing, and drive-up procedures differ.",
      "Never substitute 24160EMK30D1 by envelope alone: the 6610 kN C0 and 198 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 24160EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 4270/6610 kN ratings, 198 kN Pu and 157000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24160EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24160EMK30D1?",
        "a": "24160EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 300 mm bore, 500 mm OD and 200 mm width (11.811 × 19.685 × 7.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4270 kN, C0 6610 kN, Pu 198 kN, grease limiting speed 750 r/min, oil 950 r/min, mass about 157000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24160EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 300 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24160EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24160EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24160EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24160EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24160EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4270 kN C / 6610 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24160EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24160EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24160emk30d1",
      "＊24160emk30d1",
      "24160EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22260EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22260EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 300,
    "D_mm": 540,
    "B_mm": 140,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3470,
    "static_load_kN": 4590,
    "fatigue_load_limit_kN": 232,
    "limiting_speed_rpm": 860,
    "max_rpm": 860,
    "speed_oil_rpm": 1080,
    "weight_g": 134000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22260EMD1 belongs to the 22200 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (22200 series); the bore code resolves to 300 mm (two-digit code ×5, with the 00–03 exception table), and 540 mm OD / 140 mm width follow the general plan. Open by design, 22260EMD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Grease/oil ratio: the 860 r/min limiting value is .80 of the 1,080 r/min oil value; heavy 140 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 300 mm bore 22260EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 1,080 r/min needs drain and level design; flooding the 140 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 300 mm bearing, and drive-up procedures differ.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 300 mm bearing, and drive-up procedures differ.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 3470 kN rating no longer applies.",
      "The 3470/4590 kN ratings, 232 kN Pu and 134000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22260EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22260EMD1?",
        "a": "22260EMD1 is an NTN double-row spherical roller bearing to ISO 15: 300 mm bore, 540 mm OD and 140 mm width (11.811 × 21.26 × 5.512 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3470 kN, C0 4590 kN, Pu 232 kN, grease limiting speed 860 r/min, oil 1,080 r/min, mass about 134000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22260EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22260EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22260EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22260EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22260EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22260EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3470 kN C / 4590 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22260EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22260EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22260emd1",
      "＊22260emd1",
      "22260EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22260EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22260EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 300,
    "D_mm": 540,
    "B_mm": 140,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3470,
    "static_load_kN": 4590,
    "fatigue_load_limit_kN": 232,
    "limiting_speed_rpm": 860,
    "max_rpm": 860,
    "speed_oil_rpm": 1080,
    "weight_g": 131000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 22260EMKD1 denotes the 300 mm bore spherical roller bearing (3470 kN C / 4590 kN C0) in the 22200 series, the self-aligning choice for heavy combined load. Reading the full code: the number gives the 300×540 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Equivalent-load planning keeps a radial plus moderate axial combination on 22260EMKD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Never mount 22260EMKD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 540 mm race.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 300 mm bore 22260EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 22260EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 300×540 mm envelope is identical.",
      "Never substitute 22260EMKD1 by envelope alone: the 4590 kN C0 and 232 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 3470 kN rating no longer applies.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22260EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 3470/4590 kN ratings, 232 kN Pu and 131000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22260EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22260EMKD1?",
        "a": "22260EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 300 mm bore, 540 mm OD and 140 mm width (11.811 × 21.26 × 5.512 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3470 kN, C0 4590 kN, Pu 232 kN, grease limiting speed 860 r/min, oil 1,080 r/min, mass about 131000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22260EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22260EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22260EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22260EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22260EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22260EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3470 kN C / 4590 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22260EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22260EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22260emkd1",
      "＊22260emkd1",
      "22260EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23260EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23260EMD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 300,
    "D_mm": 540,
    "B_mm": 192,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 4520,
    "static_load_kN": 6280,
    "fatigue_load_limit_kN": 228,
    "limiting_speed_rpm": 690,
    "max_rpm": 690,
    "speed_oil_rpm": 880,
    "weight_g": 194000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23260EMD1 denotes the 300 mm bore spherical roller bearing (4520 kN C / 6280 kN C0) in the 23200 series, the self-aligning choice for heavy combined load. Digit by digit the code reads as spherical-roller dimension series plus 300 mm bore; the 192 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. With about 15.1 kN of C per millimetre of the 300 mm bore, 23260EMD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Fit the cylindrical-bore 23260EMD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 300 mm bore 23260EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The cylindrical-bore 23260EMD1 and its tapered-bore counterpart 23260EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 300 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Do not confuse EA and EM at the same number: 23260EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 300×540 mm envelope is identical.",
      "Never substitute 23260EMD1 by envelope alone: the 6280 kN C0 and 228 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 4520/6280 kN ratings, 228 kN Pu and 194000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23260EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23260EMD1?",
        "a": "23260EMD1 is an NTN double-row spherical roller bearing to ISO 15: 300 mm bore, 540 mm OD and 192 mm width (11.811 × 21.26 × 7.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4520 kN, C0 6280 kN, Pu 228 kN, grease limiting speed 690 r/min, oil 880 r/min, mass about 194000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23260EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23260EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23260EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23260EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23260EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23260EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4520 kN C / 6280 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23260EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23260EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23260emd1",
      "＊23260emd1",
      "23260EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23260EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23260EMKD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 300,
    "D_mm": 540,
    "B_mm": 192,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 4520,
    "static_load_kN": 6280,
    "fatigue_load_limit_kN": 228,
    "limiting_speed_rpm": 690,
    "max_rpm": 690,
    "speed_oil_rpm": 880,
    "weight_g": 188000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23260EMKD1 denotes the 300 mm bore spherical roller bearing (4520 kN C / 6280 kN C0) in the 23200 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (23200 series); the bore code resolves to 300 mm (two-digit code ×5, with the 00–03 exception table), and 540 mm OD / 192 mm width follow the general plan. NTN prints two speeds for 23260EMKD1: 690 r/min grease and 880 r/min oil — the gap of 190 r/min reflects oil cooling of the heavy roller set. Equivalent-load planning keeps a radial plus moderate axial combination on 23260EMKD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Never mount 23260EMKD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 540 mm race.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 300 mm bore 23260EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23260EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Do not confuse EA and EM at the same number: 23260EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 300×540 mm envelope is identical.",
      "Never substitute 23260EMKD1 by envelope alone: the 6280 kN C0 and 228 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Oil relubrication toward 880 r/min needs drain and level design; flooding the 192 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 4520/6280 kN ratings, 228 kN Pu and 188000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23260EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23260EMKD1?",
        "a": "23260EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 300 mm bore, 540 mm OD and 192 mm width (11.811 × 21.26 × 7.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4520 kN, C0 6280 kN, Pu 228 kN, grease limiting speed 690 r/min, oil 880 r/min, mass about 188000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23260EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23260EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23260EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23260EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23260EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23260EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4520 kN C / 6280 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23260EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23260EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23260emkd1",
      "＊23260emkd1",
      "23260EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22360B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22360B",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 300,
    "D_mm": 620,
    "B_mm": 185,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4000,
    "static_load_kN": 5400,
    "fatigue_load_limit_kN": 490,
    "limiting_speed_rpm": 550,
    "max_rpm": 550,
    "speed_oil_rpm": 720,
    "weight_g": 270000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 300 mm shaft, NTN supplies 22360B: sphered outer raceway, two roller rows, pressed-steel cage (standard execution), oil speed 720 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (cylindrical), lubrication feature (none); 22360B is assembled exactly in that order. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Catalogue mass 270000 g (270.00 kg) for the 300×620×185 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 300 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 300 mm bore 22360B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The cylindrical-bore 22360B and its tapered-bore counterpart 22360BK share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 4000 kN rating no longer applies.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 550 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22360B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 4000/5400 kN ratings, 490 kN Pu and 270000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22360B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22360B?",
        "a": "22360B is an NTN double-row spherical roller bearing to ISO 15: 300 mm bore, 620 mm OD and 185 mm width (11.811 × 24.409 × 7.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4000 kN, C0 5400 kN, Pu 490 kN, grease limiting speed 550 r/min, oil 720 r/min, mass about 270000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22360B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22360BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22360B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 22360B?",
        "a": "22360B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 22360B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4000 kN C / 5400 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22360BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22360BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22360b",
      "22360B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22360BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22360BK",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 300,
    "D_mm": 620,
    "B_mm": 185,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4000,
    "static_load_kN": 5400,
    "fatigue_load_limit_kN": 490,
    "limiting_speed_rpm": 550,
    "max_rpm": 550,
    "speed_oil_rpm": 720,
    "weight_g": 265000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22360BK identifies a 300×620×185 mm (11.811 × 24.409 × 7.283 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 300 mm bore; the 185 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The 160.0 mm radial section over the 300 mm bore carries two roller rows; capacity per millimetre of bore is about 13.3 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. The 160.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 185 mm-wide ring seats fully on both sides. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 300 mm set.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 300 mm bore 22360BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22360B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 300 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 300 mm bearing, and drive-up procedures differ.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22360B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 4000/5400 kN ratings, 490 kN Pu and 265000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22360BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22360BK?",
        "a": "22360BK is an NTN double-row spherical roller bearing to ISO 15: 300 mm bore, 620 mm OD and 185 mm width (11.811 × 24.409 × 7.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4000 kN, C0 5400 kN, Pu 490 kN, grease limiting speed 550 r/min, oil 720 r/min, mass about 265000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22360BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22360B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22360BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 22360BK?",
        "a": "22360BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 22360BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4000 kN C / 5400 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22360B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22360B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22360bk",
      "22360BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23964EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23964EMD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 320,
    "D_mm": 440,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1670,
    "static_load_kN": 2820,
    "fatigue_load_limit_kN": 154,
    "limiting_speed_rpm": 840,
    "max_rpm": 840,
    "speed_oil_rpm": 1080,
    "weight_g": 42100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 320 mm shaft, NTN supplies 23964EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,080 r/min. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 320 mm (two-digit code ×5, with the 00–03 exception table), and 440 mm OD / 90 mm width follow the general plan. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. 320 mm bore is 12.598 in and 440 mm OD is 17.323 in; the ISO 15 envelope swaps between brands, but the 1670/2820 kN ratings and cage design are NTN 2203E values. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 320 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 320 mm bore 23964EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 23964EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 320×440 mm envelope is identical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23964EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 320 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23964EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 1670/2820 kN ratings, 154 kN Pu and 42100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23964EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23964EMD1?",
        "a": "23964EMD1 is an NTN double-row spherical roller bearing to ISO 15: 320 mm bore, 440 mm OD and 90 mm width (12.598 × 17.323 × 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1670 kN, C0 2820 kN, Pu 154 kN, grease limiting speed 840 r/min, oil 1,080 r/min, mass about 42100 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23964EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23964EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23964EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23964EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23964EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23964EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1670 kN C / 2820 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23964EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23964EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23964emd1",
      "＊23964emd1",
      "23964EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23964EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23964EMKD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 320,
    "D_mm": 440,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1670,
    "static_load_kN": 2820,
    "fatigue_load_limit_kN": 154,
    "limiting_speed_rpm": 840,
    "max_rpm": 840,
    "speed_oil_rpm": 1080,
    "weight_g": 40800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 320 mm shaft, NTN supplies 23964EMKD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,080 r/min. Digit by digit the code reads as spherical-roller dimension series plus 320 mm bore; the 90 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. With about 5.2 kN of C per millimetre of the 320 mm bore, 23964EMKD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 320 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 320 mm bore 23964EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23964EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 320 mm bearing, and drive-up procedures differ.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 320 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 320 mm bearing, and drive-up procedures differ.",
      "The 1670/2820 kN ratings, 154 kN Pu and 40800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23964EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23964EMKD1?",
        "a": "23964EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 320 mm bore, 440 mm OD and 90 mm width (12.598 × 17.323 × 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1670 kN, C0 2820 kN, Pu 154 kN, grease limiting speed 840 r/min, oil 1,080 r/min, mass about 40800 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23964EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23964EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23964EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23964EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23964EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23964EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1670 kN C / 2820 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23964EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23964EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23964emkd1",
      "＊23964emkd1",
      "23964EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23064EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23064EMD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 320,
    "D_mm": 480,
    "B_mm": 121,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2540,
    "static_load_kN": 4020,
    "fatigue_load_limit_kN": 191,
    "limiting_speed_rpm": 850,
    "max_rpm": 850,
    "speed_oil_rpm": 1070,
    "weight_g": 78900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23064EMD1 denotes the 320 mm bore spherical roller bearing (2540 kN C / 4020 kN C0) in the 23000 series, the self-aligning choice for heavy combined load. Reading the full code: the number gives the 320×480 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Equivalent-load planning keeps a radial plus moderate axial combination on 23064EMD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 320 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 320 mm bore 23064EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 320 mm bearing, and drive-up procedures differ.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 320 mm bearing, and drive-up procedures differ.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 320 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 320 mm bearing, and drive-up procedures differ.",
      "The 2540/4020 kN ratings, 191 kN Pu and 78900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23064EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23064EMD1?",
        "a": "23064EMD1 is an NTN double-row spherical roller bearing to ISO 15: 320 mm bore, 480 mm OD and 121 mm width (12.598 × 18.898 × 4.764 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2540 kN, C0 4020 kN, Pu 191 kN, grease limiting speed 850 r/min, oil 1,070 r/min, mass about 78900 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23064EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23064EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23064EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23064EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23064EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23064EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2540 kN C / 4020 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23064EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23064EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23064emd1",
      "＊23064emd1",
      "23064EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23064EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23064EMKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 320,
    "D_mm": 480,
    "B_mm": 121,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2540,
    "static_load_kN": 4020,
    "fatigue_load_limit_kN": 191,
    "limiting_speed_rpm": 850,
    "max_rpm": 850,
    "speed_oil_rpm": 1070,
    "weight_g": 76600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23064EMKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 320 mm bore, 480 mm OD, 121 mm width, rated 850 r/min on grease. Reading the full code: the number gives the 320×480 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. The 80.0 mm radial section over the 320 mm bore carries two roller rows; capacity per millimetre of bore is about 7.9 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. The 80.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 121 mm-wide ring seats fully on both sides. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 320 mm bore 23064EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 121 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 320 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 320 mm bearing, and drive-up procedures differ.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23064EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 2540/4020 kN ratings, 191 kN Pu and 76600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23064EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23064EMKD1?",
        "a": "23064EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 320 mm bore, 480 mm OD and 121 mm width (12.598 × 18.898 × 4.764 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2540 kN, C0 4020 kN, Pu 191 kN, grease limiting speed 850 r/min, oil 1,070 r/min, mass about 76600 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23064EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23064EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23064EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23064EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23064EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23064EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2540 kN C / 4020 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23064EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23064EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23064emkd1",
      "＊23064emkd1",
      "23064EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24064EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24064EMD1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 320,
    "D_mm": 480,
    "B_mm": 160,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3250,
    "static_load_kN": 5400,
    "fatigue_load_limit_kN": 184,
    "limiting_speed_rpm": 720,
    "max_rpm": 720,
    "speed_oil_rpm": 920,
    "weight_g": 104000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24064EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 320 mm shaft — 3250 kN basic dynamic capacity in a 104000 g, open ISO 15 envelope. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 24064EMD1 is assembled exactly in that order. Two symmetric roller rows share the load: C 3250 kN, C0 5400 kN (C0/C ≈ 1.66), with useful axial capacity in either direction alongside the dominant radial load. With about 10.2 kN of C per millimetre of the 320 mm bore, 24064EMD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Fit the cylindrical-bore 24064EMD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 320 mm bore 24064EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24064EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 320 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 320 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 320 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The 3250/5400 kN ratings, 184 kN Pu and 104000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24064EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24064EMD1?",
        "a": "24064EMD1 is an NTN double-row spherical roller bearing to ISO 15: 320 mm bore, 480 mm OD and 160 mm width (12.598 × 18.898 × 6.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3250 kN, C0 5400 kN, Pu 184 kN, grease limiting speed 720 r/min, oil 920 r/min, mass about 104000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24064EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24064EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24064EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24064EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24064EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24064EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3250 kN C / 5400 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24064EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24064EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24064emd1",
      "＊24064emd1",
      "24064EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24064EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24064EMK30D1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 320,
    "D_mm": 480,
    "B_mm": 160,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3250,
    "static_load_kN": 5400,
    "fatigue_load_limit_kN": 184,
    "limiting_speed_rpm": 720,
    "max_rpm": 720,
    "speed_oil_rpm": 920,
    "weight_g": 102000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 24064EMK30D1 denotes the 320 mm bore spherical roller bearing (3250 kN C / 5400 kN C0) in the 24000 series, the self-aligning choice for heavy combined load. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K30), lubrication feature (D1); 24064EMK30D1 is assembled exactly in that order. The 1:30 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 320 mm bore assembly. The 80.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 160 mm-wide ring seats fully on both sides. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 320 mm bore 24064EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 24064EMK30D1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 320×480 mm envelope is identical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24064EMK30D1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Never substitute 24064EMK30D1 by envelope alone: the 5400 kN C0 and 184 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Do not confuse EA and EM at the same number: 24064EMK30D1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 320×480 mm envelope is identical.",
      "The 3250/5400 kN ratings, 184 kN Pu and 102000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24064EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24064EMK30D1?",
        "a": "24064EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 320 mm bore, 480 mm OD and 160 mm width (12.598 × 18.898 × 6.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3250 kN, C0 5400 kN, Pu 184 kN, grease limiting speed 720 r/min, oil 920 r/min, mass about 102000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 24064EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 320 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24064EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24064EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24064EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24064EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24064EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3250 kN C / 5400 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24064EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24064EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24064emk30d1",
      "＊24064emk30d1",
      "24064EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23164EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23164EMD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 320,
    "D_mm": 540,
    "B_mm": 176,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 4020,
    "static_load_kN": 6020,
    "fatigue_load_limit_kN": 227,
    "limiting_speed_rpm": 700,
    "max_rpm": 700,
    "speed_oil_rpm": 880,
    "weight_g": 169000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23164EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 320 mm bore, 540 mm OD, 176 mm width, rated 700 r/min on grease. Numbering ties 23164EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 320 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. NTN prints two speeds for 23164EMD1: 700 r/min grease and 880 r/min oil — the gap of 180 r/min reflects oil cooling of the heavy roller set. Selection: the C0/C ratio of 1.50 (6020/4020 kN) reflects the heavy static and shock proportioning of 23164EMD1; size the equivalent load at the required L10 with shock factor for the application. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 320 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 320 mm bore 23164EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23164EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 4020 kN rating no longer applies.",
      "Oil relubrication toward 880 r/min needs drain and level design; flooding the 176 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Oil relubrication toward 880 r/min needs drain and level design; flooding the 176 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 4020/6020 kN ratings, 227 kN Pu and 169000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23164EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23164EMD1?",
        "a": "23164EMD1 is an NTN double-row spherical roller bearing to ISO 15: 320 mm bore, 540 mm OD and 176 mm width (12.598 × 21.26 × 6.929 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4020 kN, C0 6020 kN, Pu 227 kN, grease limiting speed 700 r/min, oil 880 r/min, mass about 169000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23164EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23164EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23164EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23164EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23164EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23164EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4020 kN C / 6020 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23164EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23164EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23164emd1",
      "＊23164emd1",
      "23164EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23164EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23164EMKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 320,
    "D_mm": 540,
    "B_mm": 176,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 4020,
    "static_load_kN": 6020,
    "fatigue_load_limit_kN": 227,
    "limiting_speed_rpm": 700,
    "max_rpm": 700,
    "speed_oil_rpm": 880,
    "weight_g": 164000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 320 mm shaft, NTN supplies 23164EMKD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 880 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 23164EMKD1 is assembled exactly in that order. Suffix reading on 23164EMKD1: EM identifies the high-capacity execution with a one-piece machined brass cage; K marks the 1:12 tapered bore; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. 320 mm bore is 12.598 in and 540 mm OD is 21.26 in; the ISO 15 envelope swaps between brands, but the 4020/6020 kN ratings and cage design are NTN 2203E values. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 320 mm set.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 320 mm bore 23164EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23164EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Never substitute 23164EMKD1 by envelope alone: the 6020 kN C0 and 227 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 320 mm bearing, and drive-up procedures differ.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 176 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 4020/6020 kN ratings, 227 kN Pu and 164000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23164EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23164EMKD1?",
        "a": "23164EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 320 mm bore, 540 mm OD and 176 mm width (12.598 × 21.26 × 6.929 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4020 kN, C0 6020 kN, Pu 227 kN, grease limiting speed 700 r/min, oil 880 r/min, mass about 164000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23164EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23164EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23164EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23164EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23164EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23164EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4020 kN C / 6020 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23164EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23164EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23164emkd1",
      "＊23164emkd1",
      "23164EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24164EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24164EMD1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 320,
    "D_mm": 540,
    "B_mm": 218,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 5010,
    "static_load_kN": 7720,
    "fatigue_load_limit_kN": 225,
    "limiting_speed_rpm": 690,
    "max_rpm": 690,
    "speed_oil_rpm": 880,
    "weight_g": 204000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 320 mm shaft, NTN supplies 24164EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 880 r/min. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 320 mm (two-digit code ×5, with the 00–03 exception table), and 540 mm OD / 218 mm width follow the general plan. At 5010 kN C and 204000 g mass the 24100 series part is built for shock and vibration; the 218 mm-wide ring needs square abutments to keep both rows equally loaded. Grease/oil ratio: the 690 r/min limiting value is .78 of the 880 r/min oil value; heavy 218 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Fit the cylindrical-bore 24164EMD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 320 mm bore 24164EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 320 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The cylindrical-bore 24164EMD1 and its tapered-bore counterpart 24164EMK30D1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Oil relubrication toward 880 r/min needs drain and level design; flooding the 218 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 690 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 5010/7720 kN ratings, 225 kN Pu and 204000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24164EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24164EMD1?",
        "a": "24164EMD1 is an NTN double-row spherical roller bearing to ISO 15: 320 mm bore, 540 mm OD and 218 mm width (12.598 × 21.26 × 8.583 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5010 kN, C0 7720 kN, Pu 225 kN, grease limiting speed 690 r/min, oil 880 r/min, mass about 204000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24164EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24164EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24164EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24164EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24164EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24164EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5010 kN C / 7720 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24164EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24164EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24164emd1",
      "＊24164emd1",
      "24164EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24164EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24164EMK30D1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 320,
    "D_mm": 540,
    "B_mm": 218,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 5010,
    "static_load_kN": 7720,
    "fatigue_load_limit_kN": 225,
    "limiting_speed_rpm": 690,
    "max_rpm": 690,
    "speed_oil_rpm": 880,
    "weight_g": 201000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 24164EMK30D1 identifies a 320×540×218 mm (12.598 × 21.26 × 8.583 in) spherical roller bearing, 1:30 tapered bore (K30), to the ISO 15 boundary plan. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 320 mm (two-digit code ×5, with the 00–03 exception table), and 540 mm OD / 218 mm width follow the general plan. The 1:30 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 320 mm bore assembly. 320 mm bore is 12.598 in and 540 mm OD is 21.26 in; the ISO 15 envelope swaps between brands, but the 5010/7720 kN ratings and cage design are NTN 2203E values. Fillet radii on shaft and housing must clear the ring chamfers of the 218 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 320 mm bore 24164EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 320 mm bearing, and drive-up procedures differ.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 5010 kN rating no longer applies.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24164EMK30D1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Do not confuse EA and EM at the same number: 24164EMK30D1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 320×540 mm envelope is identical.",
      "The 5010/7720 kN ratings, 225 kN Pu and 201000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24164EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24164EMK30D1?",
        "a": "24164EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 320 mm bore, 540 mm OD and 218 mm width (12.598 × 21.26 × 8.583 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5010 kN, C0 7720 kN, Pu 225 kN, grease limiting speed 690 r/min, oil 880 r/min, mass about 201000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24164EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 320 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24164EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24164EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24164EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24164EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24164EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5010 kN C / 7720 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24164EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24164EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24164emk30d1",
      "＊24164emk30d1",
      "24164EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22264EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22264EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 320,
    "D_mm": 580,
    "B_mm": 150,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3950,
    "static_load_kN": 5100,
    "fatigue_load_limit_kN": 261,
    "limiting_speed_rpm": 800,
    "max_rpm": 800,
    "speed_oil_rpm": 1020,
    "weight_g": 177000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22264EMD1 belongs to the 22200 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. Numbering ties 22264EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 320 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Pu 261 kN against C0 5100 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22264EMD1 moves with cleanliness far more than with small C variations. Never mount 22264EMD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 580 mm race.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 320 mm bore 22264EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22264EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 800 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Do not confuse EA and EM at the same number: 22264EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 320×580 mm envelope is identical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 320 mm bearing, and drive-up procedures differ.",
      "The 3950/5100 kN ratings, 261 kN Pu and 177000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22264EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22264EMD1?",
        "a": "22264EMD1 is an NTN double-row spherical roller bearing to ISO 15: 320 mm bore, 580 mm OD and 150 mm width (12.598 × 22.835 × 5.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3950 kN, C0 5100 kN, Pu 261 kN, grease limiting speed 800 r/min, oil 1,020 r/min, mass about 177000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22264EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22264EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22264EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22264EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22264EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22264EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3950 kN C / 5100 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22264EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22264EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22264emd1",
      "＊22264emd1",
      "22264EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22264EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22264EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 320,
    "D_mm": 580,
    "B_mm": 150,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3950,
    "static_load_kN": 5100,
    "fatigue_load_limit_kN": 261,
    "limiting_speed_rpm": 800,
    "max_rpm": 800,
    "speed_oil_rpm": 1020,
    "weight_g": 174000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 320 mm shaft, NTN supplies 22264EMKD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,020 r/min. Reading the full code: the number gives the 320×580 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. 320 mm bore is 12.598 in and 580 mm OD is 22.835 in; the ISO 15 envelope swaps between brands, but the 3950/5100 kN ratings and cage design are NTN 2203E values. Mount 22264EMKD1 on its adapter or withdrawal sleeve on the 320 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 320 mm bore 22264EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 3950 kN rating no longer applies.",
      "Do not confuse EA and EM at the same number: 22264EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 320×580 mm envelope is identical.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22264EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 320 mm bearing, and drive-up procedures differ.",
      "The 3950/5100 kN ratings, 261 kN Pu and 174000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22264EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22264EMKD1?",
        "a": "22264EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 320 mm bore, 580 mm OD and 150 mm width (12.598 × 22.835 × 5.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3950 kN, C0 5100 kN, Pu 261 kN, grease limiting speed 800 r/min, oil 1,020 r/min, mass about 174000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22264EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22264EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22264EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22264EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22264EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22264EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3950 kN C / 5100 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22264EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22264EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22264emkd1",
      "＊22264emkd1",
      "22264EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23264EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23264EMD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 320,
    "D_mm": 580,
    "B_mm": 208,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 5230,
    "static_load_kN": 7370,
    "fatigue_load_limit_kN": 259,
    "limiting_speed_rpm": 640,
    "max_rpm": 640,
    "speed_oil_rpm": 820,
    "weight_g": 245000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23264EMD1 denotes the 320 mm bore spherical roller bearing (5230 kN C / 7370 kN C0) in the 23200 series, the self-aligning choice for heavy combined load. Digit by digit the code reads as spherical-roller dimension series plus 320 mm bore; the 208 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Two symmetric roller rows share the load: C 5230 kN, C0 7370 kN (C0/C ≈ 1.41), with useful axial capacity in either direction alongside the dominant radial load. Speed planning: 640 r/min grease limiting speed is the cage/kinematic ceiling and 820 r/min is the oil-lubricated value for the 320 mm bore; vibrating screens rarely approach either and are load/cage limited instead. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 23264EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 320 mm bore 23264EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23264EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 320 mm bearing, and drive-up procedures differ.",
      "Do not confuse EA and EM at the same number: 23264EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 320×580 mm envelope is identical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 320 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The 5230/7370 kN ratings, 259 kN Pu and 245000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23264EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23264EMD1?",
        "a": "23264EMD1 is an NTN double-row spherical roller bearing to ISO 15: 320 mm bore, 580 mm OD and 208 mm width (12.598 × 22.835 × 8.189 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5230 kN, C0 7370 kN, Pu 259 kN, grease limiting speed 640 r/min, oil 820 r/min, mass about 245000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23264EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23264EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23264EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23264EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23264EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23264EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5230 kN C / 7370 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23264EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23264EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23264emd1",
      "＊23264emd1",
      "23264EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23264EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23264EMKD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 320,
    "D_mm": 580,
    "B_mm": 208,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 5230,
    "static_load_kN": 7370,
    "fatigue_load_limit_kN": 259,
    "limiting_speed_rpm": 640,
    "max_rpm": 640,
    "speed_oil_rpm": 820,
    "weight_g": 238000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23264EMKD1 belongs to the 23200 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (23200 series); the bore code resolves to 320 mm (two-digit code ×5, with the 00–03 exception table), and 580 mm OD / 208 mm width follow the general plan. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. 320 mm bore is 12.598 in and 580 mm OD is 22.835 in; the ISO 15 envelope swaps between brands, but the 5230/7370 kN ratings and cage design are NTN 2203E values. Fillet radii on shaft and housing must clear the ring chamfers of the 208 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 320 mm bore 23264EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23264EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Do not confuse EA and EM at the same number: 23264EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 320×580 mm envelope is identical.",
      "Do not confuse EA and EM at the same number: 23264EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 320×580 mm envelope is identical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23264EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 5230/7370 kN ratings, 259 kN Pu and 238000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23264EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23264EMKD1?",
        "a": "23264EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 320 mm bore, 580 mm OD and 208 mm width (12.598 × 22.835 × 8.189 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5230 kN, C0 7370 kN, Pu 259 kN, grease limiting speed 640 r/min, oil 820 r/min, mass about 238000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23264EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23264EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23264EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23264EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23264EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23264EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5230 kN C / 7370 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23264EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23264EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23264emkd1",
      "＊23264emkd1",
      "23264EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23968EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23968EMD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 340,
    "D_mm": 460,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1710,
    "static_load_kN": 2980,
    "fatigue_load_limit_kN": 162,
    "limiting_speed_rpm": 800,
    "max_rpm": 800,
    "speed_oil_rpm": 1020,
    "weight_g": 44500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 340 mm shaft, NTN supplies 23968EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,020 r/min. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 340 mm (two-digit code ×5, with the 00–03 exception table), and 460 mm OD / 90 mm width follow the general plan. The cylindrical bore fits a machined 340 mm shaft seat directly; the same envelope in 23968EMKD1 (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Pu 162 kN against C0 2980 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23968EMD1 moves with cleanliness far more than with small C variations. Never mount 23968EMD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 460 mm race.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 340 mm bore 23968EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1710 kN rating no longer applies.",
      "Do not confuse EA and EM at the same number: 23968EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 340×460 mm envelope is identical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 340 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Do not confuse EA and EM at the same number: 23968EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 340×460 mm envelope is identical.",
      "The 1710/2980 kN ratings, 162 kN Pu and 44500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23968EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23968EMD1?",
        "a": "23968EMD1 is an NTN double-row spherical roller bearing to ISO 15: 340 mm bore, 460 mm OD and 90 mm width (13.386 × 18.11 × 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1710 kN, C0 2980 kN, Pu 162 kN, grease limiting speed 800 r/min, oil 1,020 r/min, mass about 44500 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23968EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23968EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23968EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23968EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23968EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23968EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1710 kN C / 2980 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23968EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23968EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23968emd1",
      "＊23968emd1",
      "23968EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23968EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23968EMKD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 340,
    "D_mm": 460,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1710,
    "static_load_kN": 2980,
    "fatigue_load_limit_kN": 162,
    "limiting_speed_rpm": 800,
    "max_rpm": 800,
    "speed_oil_rpm": 1020,
    "weight_g": 43100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23968EMKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 340 mm bore, 460 mm OD, 90 mm width, rated 800 r/min on grease. Digit by digit the code reads as spherical-roller dimension series plus 340 mm bore; the 90 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The 60.0 mm radial section over the 340 mm bore carries two roller rows; capacity per millimetre of bore is about 5.0 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Pu 162 kN against C0 2980 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23968EMKD1 moves with cleanliness far more than with small C variations. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 340 mm set.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 340 mm bore 23968EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23968EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 340 mm bearing, and drive-up procedures differ.",
      "Never substitute 23968EMKD1 by envelope alone: the 2980 kN C0 and 162 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23968EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 1710/2980 kN ratings, 162 kN Pu and 43100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23968EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23968EMKD1?",
        "a": "23968EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 340 mm bore, 460 mm OD and 90 mm width (13.386 × 18.11 × 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1710 kN, C0 2980 kN, Pu 162 kN, grease limiting speed 800 r/min, oil 1,020 r/min, mass about 43100 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23968EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23968EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23968EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23968EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23968EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23968EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1710 kN C / 2980 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23968EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23968EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23968emkd1",
      "＊23968emkd1",
      "23968EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23068EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23068EMD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 340,
    "D_mm": 520,
    "B_mm": 133,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2990,
    "static_load_kN": 4690,
    "fatigue_load_limit_kN": 219,
    "limiting_speed_rpm": 790,
    "max_rpm": 790,
    "speed_oil_rpm": 1000,
    "weight_g": 98500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23068EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 340 mm shaft — 2990 kN basic dynamic capacity in a 98500 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 340 mm bore; the 133 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Open by design, 23068EMD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Catalogue mass 98500 g (98.50 kg) for the 340×520×133 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 340 mm set.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 340 mm bore 23068EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The cylindrical-bore 23068EMD1 and its tapered-bore counterpart 23068EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Oil relubrication toward 1,000 r/min needs drain and level design; flooding the 133 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23068EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 2990 kN rating no longer applies.",
      "The 2990/4690 kN ratings, 219 kN Pu and 98500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23068EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23068EMD1?",
        "a": "23068EMD1 is an NTN double-row spherical roller bearing to ISO 15: 340 mm bore, 520 mm OD and 133 mm width (13.386 × 20.472 × 5.236 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2990 kN, C0 4690 kN, Pu 219 kN, grease limiting speed 790 r/min, oil 1,000 r/min, mass about 98500 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23068EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23068EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23068EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23068EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23068EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23068EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2990 kN C / 4690 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23068EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23068EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23068emd1",
      "＊23068emd1",
      "23068EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23068EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23068EMKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 340,
    "D_mm": 520,
    "B_mm": 133,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2990,
    "static_load_kN": 4690,
    "fatigue_load_limit_kN": 219,
    "limiting_speed_rpm": 790,
    "max_rpm": 790,
    "speed_oil_rpm": 1000,
    "weight_g": 95500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23068EMKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 340×520×133 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). Reading the full code: the number gives the 340×520 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. Open by design, 23068EMKD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. 340 mm bore is 13.386 in and 520 mm OD is 20.472 in; the ISO 15 envelope swaps between brands, but the 2990/4690 kN ratings and cage design are NTN 2203E values. Fillet radii on shaft and housing must clear the ring chamfers of the 133 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 340 mm bore 23068EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 1,000 r/min needs drain and level design; flooding the 133 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 340 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Oil relubrication toward 1,000 r/min needs drain and level design; flooding the 133 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 2990 kN rating no longer applies.",
      "The 2990/4690 kN ratings, 219 kN Pu and 95500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23068EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23068EMKD1?",
        "a": "23068EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 340 mm bore, 520 mm OD and 133 mm width (13.386 × 20.472 × 5.236 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2990 kN, C0 4690 kN, Pu 219 kN, grease limiting speed 790 r/min, oil 1,000 r/min, mass about 95500 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23068EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23068EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23068EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23068EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23068EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23068EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2990 kN C / 4690 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23068EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23068EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23068emkd1",
      "＊23068emkd1",
      "23068EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24068EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24068EMD1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 340,
    "D_mm": 520,
    "B_mm": 180,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3910,
    "static_load_kN": 6510,
    "fatigue_load_limit_kN": 206,
    "limiting_speed_rpm": 670,
    "max_rpm": 670,
    "speed_oil_rpm": 860,
    "weight_g": 140000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24068EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 340 mm shaft — 3910 kN basic dynamic capacity in a 140000 g, open ISO 15 envelope. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 24068EMD1 is assembled exactly in that order. Suffix reading on 24068EMD1: EM identifies the high-capacity execution with a one-piece machined brass cage; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. Pu 206 kN against C0 6510 kN anchors the contamination derating; for dirty mining duty the adjusted life of 24068EMD1 moves with cleanliness far more than with small C variations. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 340 mm set.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 340 mm bore 24068EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 670 r/min grease rating is lost to abrasive wear long before fatigue.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 340 mm bearing, and drive-up procedures differ.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24068EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 180 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 3910/6510 kN ratings, 206 kN Pu and 140000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24068EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24068EMD1?",
        "a": "24068EMD1 is an NTN double-row spherical roller bearing to ISO 15: 340 mm bore, 520 mm OD and 180 mm width (13.386 × 20.472 × 7.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3910 kN, C0 6510 kN, Pu 206 kN, grease limiting speed 670 r/min, oil 860 r/min, mass about 140000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24068EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24068EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24068EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24068EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24068EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24068EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3910 kN C / 6510 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24068EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24068EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24068emd1",
      "＊24068emd1",
      "24068EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24068EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24068EMK30D1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 340,
    "D_mm": 520,
    "B_mm": 180,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3910,
    "static_load_kN": 6510,
    "fatigue_load_limit_kN": 206,
    "limiting_speed_rpm": 670,
    "max_rpm": 670,
    "speed_oil_rpm": 860,
    "weight_g": 137000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24068EMK30D1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 340×520×180 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). Numbering ties 24068EMK30D1 to its envelope and execution: same-number EA versus EM or plain variants share the 340 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Pu 206 kN against C0 6510 kN anchors the contamination derating; for dirty mining duty the adjusted life of 24068EMK30D1 moves with cleanliness far more than with small C variations. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 340 mm bore 24068EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 3910 kN rating no longer applies.",
      "Never substitute 24068EMK30D1 by envelope alone: the 6510 kN C0 and 206 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24068EMK30D1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 340 mm bearing, and drive-up procedures differ.",
      "The 3910/6510 kN ratings, 206 kN Pu and 137000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24068EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24068EMK30D1?",
        "a": "24068EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 340 mm bore, 520 mm OD and 180 mm width (13.386 × 20.472 × 7.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3910 kN, C0 6510 kN, Pu 206 kN, grease limiting speed 670 r/min, oil 860 r/min, mass about 137000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 24068EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 340 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24068EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24068EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24068EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24068EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24068EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3910 kN C / 6510 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24068EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24068EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24068emk30d1",
      "＊24068emk30d1",
      "24068EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23168EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23168EMD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 340,
    "D_mm": 580,
    "B_mm": 190,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 4670,
    "static_load_kN": 6870,
    "fatigue_load_limit_kN": 257,
    "limiting_speed_rpm": 650,
    "max_rpm": 650,
    "speed_oil_rpm": 830,
    "weight_g": 213000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23168EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 340 mm bore, 580 mm OD, 190 mm width, rated 650 r/min on grease. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 23168EMD1 is assembled exactly in that order. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. 340 mm bore is 13.386 in and 580 mm OD is 22.835 in; the ISO 15 envelope swaps between brands, but the 4670/6870 kN ratings and cage design are NTN 2203E values. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 340 mm bore 23168EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 650 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23168EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 340 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23168EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 4670/6870 kN ratings, 257 kN Pu and 213000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23168EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23168EMD1?",
        "a": "23168EMD1 is an NTN double-row spherical roller bearing to ISO 15: 340 mm bore, 580 mm OD and 190 mm width (13.386 × 22.835 × 7.48 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4670 kN, C0 6870 kN, Pu 257 kN, grease limiting speed 650 r/min, oil 830 r/min, mass about 213000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23168EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23168EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23168EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23168EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23168EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23168EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4670 kN C / 6870 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23168EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23168EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23168emd1",
      "＊23168emd1",
      "23168EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23168EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23168EMKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 340,
    "D_mm": 580,
    "B_mm": 190,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 4670,
    "static_load_kN": 6870,
    "fatigue_load_limit_kN": 257,
    "limiting_speed_rpm": 650,
    "max_rpm": 650,
    "speed_oil_rpm": 830,
    "weight_g": 206000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23168EMKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 340 mm bore, 580 mm OD, 190 mm width, rated 650 r/min on grease. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 23168EMKD1 is assembled exactly in that order. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. Catalogue mass 206000 g (206.00 kg) for the 340×580×190 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 340 mm bore 23168EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23168EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Never substitute 23168EMKD1 by envelope alone: the 6870 kN C0 and 257 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 340 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Never substitute 23168EMKD1 by envelope alone: the 6870 kN C0 and 257 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 4670/6870 kN ratings, 257 kN Pu and 206000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23168EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23168EMKD1?",
        "a": "23168EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 340 mm bore, 580 mm OD and 190 mm width (13.386 × 22.835 × 7.48 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4670 kN, C0 6870 kN, Pu 257 kN, grease limiting speed 650 r/min, oil 830 r/min, mass about 206000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23168EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23168EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23168EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23168EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23168EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23168EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4670 kN C / 6870 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23168EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23168EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23168emkd1",
      "＊23168emkd1",
      "23168EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24168EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24168EMD1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 340,
    "D_mm": 580,
    "B_mm": 243,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 5980,
    "static_load_kN": 9340,
    "fatigue_load_limit_kN": 254,
    "limiting_speed_rpm": 650,
    "max_rpm": 650,
    "speed_oil_rpm": 830,
    "weight_g": 266000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 340 mm shaft, NTN supplies 24168EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 830 r/min. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 340 mm (two-digit code ×5, with the 00–03 exception table), and 580 mm OD / 243 mm width follow the general plan. Open by design, 24168EMD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. With about 17.6 kN of C per millimetre of the 340 mm bore, 24168EMD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 340 mm set.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 340 mm bore 24168EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 24168EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 340×580 mm envelope is identical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 5980 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 340 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 5980 kN rating no longer applies.",
      "The 5980/9340 kN ratings, 254 kN Pu and 266000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24168EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24168EMD1?",
        "a": "24168EMD1 is an NTN double-row spherical roller bearing to ISO 15: 340 mm bore, 580 mm OD and 243 mm width (13.386 × 22.835 × 9.567 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5980 kN, C0 9340 kN, Pu 254 kN, grease limiting speed 650 r/min, oil 830 r/min, mass about 266000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24168EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24168EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24168EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24168EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24168EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24168EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5980 kN C / 9340 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24168EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24168EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24168emd1",
      "＊24168emd1",
      "24168EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24168EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24168EMK30D1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 340,
    "D_mm": 580,
    "B_mm": 243,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 5980,
    "static_load_kN": 9340,
    "fatigue_load_limit_kN": 254,
    "limiting_speed_rpm": 650,
    "max_rpm": 650,
    "speed_oil_rpm": 830,
    "weight_g": 262000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24168EMK30D1 belongs to the 24100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. Digit by digit the code reads as spherical-roller dimension series plus 340 mm bore; the 243 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. At 5980 kN C and 262000 g mass the 24100 series part is built for shock and vibration; the 243 mm-wide ring needs square abutments to keep both rows equally loaded. The 120.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 243 mm-wide ring seats fully on both sides. Never mount 24168EMK30D1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 580 mm race.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 340 mm bore 24168EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 24168EMK30D1 by envelope alone: the 9340 kN C0 and 254 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Oil relubrication toward 830 r/min needs drain and level design; flooding the 243 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Do not confuse EA and EM at the same number: 24168EMK30D1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 340×580 mm envelope is identical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 650 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 5980/9340 kN ratings, 254 kN Pu and 262000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24168EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24168EMK30D1?",
        "a": "24168EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 340 mm bore, 580 mm OD and 243 mm width (13.386 × 22.835 × 9.567 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5980 kN, C0 9340 kN, Pu 254 kN, grease limiting speed 650 r/min, oil 830 r/min, mass about 262000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24168EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 340 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24168EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24168EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24168EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24168EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24168EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5980 kN C / 9340 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24168EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24168EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24168emk30d1",
      "＊24168emk30d1",
      "24168EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23268B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23268B",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 340,
    "D_mm": 620,
    "B_mm": 224,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4950,
    "static_load_kN": 8000,
    "fatigue_load_limit_kN": 585,
    "limiting_speed_rpm": 490,
    "max_rpm": 490,
    "speed_oil_rpm": 630,
    "weight_g": 300000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23268B denotes the 340 mm bore spherical roller bearing (4950 kN C / 8000 kN C0) in the 23200 series, the self-aligning choice for heavy combined load. Numbering ties 23268B to its envelope and execution: same-number EA versus EM or plain variants share the 340 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the basic cage. Selection: the C0/C ratio of 1.62 (8000/4950 kN) reflects the heavy static and shock proportioning of 23268B; size the equivalent load at the required L10 with shock factor for the application. Never mount 23268B by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 620 mm race.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 340 mm bore 23268B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 224 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 23268B by envelope alone: the 8000 kN C0 and 585 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 340 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Never substitute 23268B by envelope alone: the 8000 kN C0 and 585 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The 4950/8000 kN ratings, 585 kN Pu and 300000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23268B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23268B?",
        "a": "23268B is an NTN double-row spherical roller bearing to ISO 15: 340 mm bore, 620 mm OD and 224 mm width (13.386 × 24.409 × 8.819 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4950 kN, C0 8000 kN, Pu 585 kN, grease limiting speed 490 r/min, oil 630 r/min, mass about 300000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23268B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23268BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23268B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23268B?",
        "a": "23268B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23268B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4950 kN C / 8000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23268BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23268BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23268b",
      "23268B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23268BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23268BK",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 340,
    "D_mm": 620,
    "B_mm": 224,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4950,
    "static_load_kN": 8000,
    "fatigue_load_limit_kN": 585,
    "limiting_speed_rpm": 490,
    "max_rpm": 490,
    "speed_oil_rpm": 630,
    "weight_g": 291000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23268BK belongs to the 23200 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. Digit by digit the code reads as spherical-roller dimension series plus 340 mm bore; the 224 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The 1:12 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 340 mm bore assembly. 340 mm bore is 13.386 in and 620 mm OD is 24.409 in; the ISO 15 envelope swaps between brands, but the 4950/8000 kN ratings and cage design are NTN 2203E values. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 340 mm set.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 340 mm bore 23268BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23268B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 490 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Oil relubrication toward 630 r/min needs drain and level design; flooding the 224 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Do not confuse EA and EM at the same number: 23268BK carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 340×620 mm envelope is identical.",
      "The 4950/8000 kN ratings, 585 kN Pu and 291000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23268BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23268BK?",
        "a": "23268BK is an NTN double-row spherical roller bearing to ISO 15: 340 mm bore, 620 mm OD and 224 mm width (13.386 × 24.409 × 8.819 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4950 kN, C0 8000 kN, Pu 585 kN, grease limiting speed 490 r/min, oil 630 r/min, mass about 291000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23268BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23268B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23268BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23268BK?",
        "a": "23268BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23268BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4950 kN C / 8000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23268B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23268B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23268bk",
      "23268BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23972EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23972EMD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 360,
    "D_mm": 480,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1750,
    "static_load_kN": 3090,
    "fatigue_load_limit_kN": 171,
    "limiting_speed_rpm": 760,
    "max_rpm": 760,
    "speed_oil_rpm": 970,
    "weight_g": 46200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23972EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 360 mm bore, 480 mm OD, 90 mm width, rated 760 r/min on grease. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 360 mm (two-digit code ×5, with the 00–03 exception table), and 480 mm OD / 90 mm width follow the general plan. Pu 171 kN is the catalogue fatigue load limit for 23972EMD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. 360 mm bore is 14.173 in and 480 mm OD is 18.898 in; the ISO 15 envelope swaps between brands, but the 1750/3090 kN ratings and cage design are NTN 2203E values. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 360 mm set.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 360 mm bore 23972EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23972EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23972EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 360 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23972EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 1750/3090 kN ratings, 171 kN Pu and 46200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23972EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23972EMD1?",
        "a": "23972EMD1 is an NTN double-row spherical roller bearing to ISO 15: 360 mm bore, 480 mm OD and 90 mm width (14.173 × 18.898 × 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1750 kN, C0 3090 kN, Pu 171 kN, grease limiting speed 760 r/min, oil 970 r/min, mass about 46200 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23972EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23972EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23972EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23972EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23972EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23972EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1750 kN C / 3090 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23972EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23972EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23972emd1",
      "＊23972emd1",
      "23972EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23972EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23972EMKD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 360,
    "D_mm": 480,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1750,
    "static_load_kN": 3090,
    "fatigue_load_limit_kN": 171,
    "limiting_speed_rpm": 760,
    "max_rpm": 760,
    "speed_oil_rpm": 970,
    "weight_g": 44800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23972EMKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 360×480×90 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 23972EMKD1 is assembled exactly in that order. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Equivalent-load planning keeps a radial plus moderate axial combination on 23972EMKD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Mount 23972EMKD1 on its adapter or withdrawal sleeve on the 360 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 360 mm bore 23972EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 90 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 760 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Do not confuse EA and EM at the same number: 23972EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 360×480 mm envelope is identical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 360 mm bearing, and drive-up procedures differ.",
      "The 1750/3090 kN ratings, 171 kN Pu and 44800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23972EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23972EMKD1?",
        "a": "23972EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 360 mm bore, 480 mm OD and 90 mm width (14.173 × 18.898 × 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1750 kN, C0 3090 kN, Pu 171 kN, grease limiting speed 760 r/min, oil 970 r/min, mass about 44800 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23972EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23972EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23972EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23972EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23972EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23972EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1750 kN C / 3090 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23972EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23972EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23972emkd1",
      "＊23972emkd1",
      "23972EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23072EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23072EMD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 360,
    "D_mm": 540,
    "B_mm": 134,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3070,
    "static_load_kN": 4910,
    "fatigue_load_limit_kN": 232,
    "limiting_speed_rpm": 750,
    "max_rpm": 750,
    "speed_oil_rpm": 950,
    "weight_g": 111000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23072EMD1 denotes the 360 mm bore spherical roller bearing (3070 kN C / 4910 kN C0) in the 23000 series, the self-aligning choice for heavy combined load. Reading the full code: the number gives the 360×540 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. The cylindrical bore fits a machined 360 mm shaft seat directly; the same envelope in 23072EMKD1 (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Equivalent-load planning keeps a radial plus moderate axial combination on 23072EMD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 360 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 360 mm bore 23072EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 3070 kN rating no longer applies.",
      "Do not confuse EA and EM at the same number: 23072EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 360×540 mm envelope is identical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 360 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Do not confuse EA and EM at the same number: 23072EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 360×540 mm envelope is identical.",
      "The 3070/4910 kN ratings, 232 kN Pu and 111000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23072EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23072EMD1?",
        "a": "23072EMD1 is an NTN double-row spherical roller bearing to ISO 15: 360 mm bore, 540 mm OD and 134 mm width (14.173 × 21.26 × 5.276 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3070 kN, C0 4910 kN, Pu 232 kN, grease limiting speed 750 r/min, oil 950 r/min, mass about 111000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23072EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23072EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23072EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23072EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23072EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23072EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3070 kN C / 4910 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23072EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23072EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23072emd1",
      "＊23072emd1",
      "23072EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23072EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23072EMKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 360,
    "D_mm": 540,
    "B_mm": 134,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3070,
    "static_load_kN": 4910,
    "fatigue_load_limit_kN": 232,
    "limiting_speed_rpm": 750,
    "max_rpm": 750,
    "speed_oil_rpm": 950,
    "weight_g": 108000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23072EMKD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 360 mm shaft — 3070 kN basic dynamic capacity in a 108000 g, open ISO 15 envelope. Numbering ties 23072EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 360 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Suffix reading on 23072EMKD1: EM identifies the high-capacity execution with a one-piece machined brass cage; K marks the 1:12 tapered bore; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. Pu 232 kN against C0 4910 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23072EMKD1 moves with cleanliness far more than with small C variations. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 360 mm bore 23072EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 750 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 360 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Never substitute 23072EMKD1 by envelope alone: the 4910 kN C0 and 232 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 134 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 3070/4910 kN ratings, 232 kN Pu and 108000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23072EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23072EMKD1?",
        "a": "23072EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 360 mm bore, 540 mm OD and 134 mm width (14.173 × 21.26 × 5.276 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3070 kN, C0 4910 kN, Pu 232 kN, grease limiting speed 750 r/min, oil 950 r/min, mass about 108000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23072EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23072EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23072EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23072EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23072EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23072EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3070 kN C / 4910 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23072EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23072EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23072emkd1",
      "＊23072emkd1",
      "23072EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24072EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24072EMD1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 360,
    "D_mm": 540,
    "B_mm": 180,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 4040,
    "static_load_kN": 6840,
    "fatigue_load_limit_kN": 220,
    "limiting_speed_rpm": 640,
    "max_rpm": 640,
    "speed_oil_rpm": 820,
    "weight_g": 147000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24072EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 360 mm shaft — 4040 kN basic dynamic capacity in a 147000 g, open ISO 15 envelope. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 24072EMD1 is assembled exactly in that order. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. 360 mm bore is 14.173 in and 540 mm OD is 21.26 in; the ISO 15 envelope swaps between brands, but the 4040/6840 kN ratings and cage design are NTN 2203E values. Never mount 24072EMD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 540 mm race.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 360 mm bore 24072EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 24072EMD1 by envelope alone: the 6840 kN C0 and 220 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24072EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24072EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 360 mm bearing, and drive-up procedures differ.",
      "The 4040/6840 kN ratings, 220 kN Pu and 147000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24072EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24072EMD1?",
        "a": "24072EMD1 is an NTN double-row spherical roller bearing to ISO 15: 360 mm bore, 540 mm OD and 180 mm width (14.173 × 21.26 × 7.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4040 kN, C0 6840 kN, Pu 220 kN, grease limiting speed 640 r/min, oil 820 r/min, mass about 147000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24072EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24072EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24072EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24072EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24072EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24072EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4040 kN C / 6840 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24072EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24072EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24072emd1",
      "＊24072emd1",
      "24072EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24072EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24072EMK30D1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 360,
    "D_mm": 540,
    "B_mm": 180,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 4040,
    "static_load_kN": 6840,
    "fatigue_load_limit_kN": 220,
    "limiting_speed_rpm": 640,
    "max_rpm": 640,
    "speed_oil_rpm": 820,
    "weight_g": 145000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24072EMK30D1 belongs to the 24000 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K30), lubrication feature (D1); 24072EMK30D1 is assembled exactly in that order. NTN prints two speeds for 24072EMK30D1: 640 r/min grease and 820 r/min oil — the gap of 180 r/min reflects oil cooling of the heavy roller set. Pu 220 kN against C0 6840 kN anchors the contamination derating; for dirty mining duty the adjusted life of 24072EMK30D1 moves with cleanliness far more than with small C variations. Fillet radii on shaft and housing must clear the ring chamfers of the 180 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 360 mm bore 24072EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 4040 kN rating no longer applies.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 24072EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 180 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Oil relubrication toward 820 r/min needs drain and level design; flooding the 180 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 4040/6840 kN ratings, 220 kN Pu and 145000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24072EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24072EMK30D1?",
        "a": "24072EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 360 mm bore, 540 mm OD and 180 mm width (14.173 × 21.26 × 7.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4040 kN, C0 6840 kN, Pu 220 kN, grease limiting speed 640 r/min, oil 820 r/min, mass about 145000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 24072EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 360 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24072EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24072EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24072EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24072EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24072EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4040 kN C / 6840 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24072EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24072EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24072emk30d1",
      "＊24072emk30d1",
      "24072EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23172B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23172B",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 360,
    "D_mm": 600,
    "B_mm": 192,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4200,
    "static_load_kN": 7050,
    "fatigue_load_limit_kN": 530,
    "limiting_speed_rpm": 490,
    "max_rpm": 490,
    "speed_oil_rpm": 630,
    "weight_g": 222000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23172B denotes the 360 mm bore spherical roller bearing (4200 kN C / 7050 kN C0) in the 23100 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (23100 series); the bore code resolves to 360 mm (two-digit code ×5, with the 00–03 exception table), and 600 mm OD / 192 mm width follow the general plan. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the basic cage. Catalogue mass 222000 g (222.00 kg) for the 360×600×192 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Fillet radii on shaft and housing must clear the ring chamfers of the 192 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 360 mm bore 23172B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 192 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 490 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 192 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 23172B by envelope alone: the 7050 kN C0 and 530 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The 4200/7050 kN ratings, 530 kN Pu and 222000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23172B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23172B?",
        "a": "23172B is an NTN double-row spherical roller bearing to ISO 15: 360 mm bore, 600 mm OD and 192 mm width (14.173 × 23.622 × 7.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4200 kN, C0 7050 kN, Pu 530 kN, grease limiting speed 490 r/min, oil 630 r/min, mass about 222000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23172B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23172BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23172B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23172B?",
        "a": "23172B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23172B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4200 kN C / 7050 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23172BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23172BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23172b",
      "23172B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23172BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23172BK",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 360,
    "D_mm": 600,
    "B_mm": 192,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4200,
    "static_load_kN": 7050,
    "fatigue_load_limit_kN": 530,
    "limiting_speed_rpm": 490,
    "max_rpm": 490,
    "speed_oil_rpm": 630,
    "weight_g": 215000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23172BK identifies a 360×600×192 mm (14.173 × 23.622 × 7.559 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Numbering ties 23172BK to its envelope and execution: same-number EA versus EM or plain variants share the 360 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Suffix reading on 23172BK: the bare number is the standard open execution; K marks the 1:12 tapered bore; B marks the standard large-bore internal design on slash-size 230–232 series; quote the full code because each suffix is a distinct article. Selection: the C0/C ratio of 1.68 (7050/4200 kN) reflects the heavy static and shock proportioning of 23172BK; size the equivalent load at the required L10 with shock factor for the application. Never mount 23172BK by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 600 mm race.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 360 mm bore 23172BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 23172BK carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 360×600 mm envelope is identical.",
      "Never substitute 23172BK by envelope alone: the 7050 kN C0 and 530 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 360 mm bearing, and drive-up procedures differ.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 192 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 4200/7050 kN ratings, 530 kN Pu and 215000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23172BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23172BK?",
        "a": "23172BK is an NTN double-row spherical roller bearing to ISO 15: 360 mm bore, 600 mm OD and 192 mm width (14.173 × 23.622 × 7.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4200 kN, C0 7050 kN, Pu 530 kN, grease limiting speed 490 r/min, oil 630 r/min, mass about 215000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23172BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23172B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23172BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23172BK?",
        "a": "23172BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23172BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4200 kN C / 7050 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23172B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23172B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23172bk",
      "23172BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24172B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24172B",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 360,
    "D_mm": 600,
    "B_mm": 243,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5100,
    "static_load_kN": 9150,
    "fatigue_load_limit_kN": 470,
    "limiting_speed_rpm": 490,
    "max_rpm": 490,
    "speed_oil_rpm": 630,
    "weight_g": 281000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 24172B with a cylindrical bore and plain outer ring (no D1/W33 groove): 360 mm bore, 600 mm OD, 243 mm width, rated 490 r/min on grease. Reading the full code: the number gives the 360×600 mm envelope, — names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and plain outer ring (no D1/W33 groove) completes the order number. The cylindrical bore fits a machined 360 mm shaft seat directly; the same envelope in 24172BK30 (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. With about 14.2 kN of C per millimetre of the 360 mm bore, 24172B screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Fillet radii on shaft and housing must clear the ring chamfers of the 243 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 360 mm bore 24172B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 490 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 360 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 5100 kN rating no longer applies.",
      "Do not confuse EA and EM at the same number: 24172B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 360×600 mm envelope is identical.",
      "The 5100/9150 kN ratings, 470 kN Pu and 281000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24172B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24172B?",
        "a": "24172B is an NTN double-row spherical roller bearing to ISO 15: 360 mm bore, 600 mm OD and 243 mm width (14.173 × 23.622 × 9.567 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5100 kN, C0 9150 kN, Pu 470 kN, grease limiting speed 490 r/min, oil 630 r/min, mass about 281000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24172B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24172BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24172B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24172B?",
        "a": "24172B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24172B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5100 kN C / 9150 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24172BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24172BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24172b",
      "24172B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24172BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24172BK30",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 360,
    "D_mm": 600,
    "B_mm": 243,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5100,
    "static_load_kN": 9150,
    "fatigue_load_limit_kN": 470,
    "limiting_speed_rpm": 490,
    "max_rpm": 490,
    "speed_oil_rpm": 630,
    "weight_g": 277000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 24172BK30 denotes the 360 mm bore spherical roller bearing (5100 kN C / 9150 kN C0) in the 24100 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 360 mm (two-digit code ×5, with the 00–03 exception table), and 600 mm OD / 243 mm width follow the general plan. Suffix reading on 24172BK30: the bare number is the standard open execution; K30 marks the 1:30 tapered bore of the wide series; B marks the standard large-bore internal design on slash-size 230–232 series; quote the full code because each suffix is a distinct article. Equivalent-load planning keeps a radial plus moderate axial combination on 24172BK30; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 360 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 360 mm bore 24172BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 360 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24172BK30 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 243 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 243 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 5100/9150 kN ratings, 470 kN Pu and 277000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24172BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24172BK30?",
        "a": "24172BK30 is an NTN double-row spherical roller bearing to ISO 15: 360 mm bore, 600 mm OD and 243 mm width (14.173 × 23.622 × 9.567 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5100 kN, C0 9150 kN, Pu 470 kN, grease limiting speed 490 r/min, oil 630 r/min, mass about 277000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24172BK30 mounts on a matching adapter or withdrawal sleeve on a plain 360 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24172B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24172BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24172BK30?",
        "a": "24172BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24172BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5100 kN C / 9150 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24172B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24172B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24172bk30",
      "24172BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23272B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23272B",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 360,
    "D_mm": 650,
    "B_mm": 232,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5400,
    "static_load_kN": 8700,
    "fatigue_load_limit_kN": 620,
    "limiting_speed_rpm": 450,
    "max_rpm": 450,
    "speed_oil_rpm": 590,
    "weight_g": 339000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23272B belongs to the 23200 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. Numbering ties 23272B to its envelope and execution: same-number EA versus EM or plain variants share the 360 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. 360 mm bore is 14.173 in and 650 mm OD is 25.591 in; the ISO 15 envelope swaps between brands, but the 5400/8700 kN ratings and cage design are NTN 2203E values. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 360 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 360 mm bore 23272B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23272B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Oil relubrication toward 590 r/min needs drain and level design; flooding the 232 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Never substitute 23272B by envelope alone: the 8700 kN C0 and 620 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23272B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 5400/8700 kN ratings, 620 kN Pu and 339000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23272B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23272B?",
        "a": "23272B is an NTN double-row spherical roller bearing to ISO 15: 360 mm bore, 650 mm OD and 232 mm width (14.173 × 25.591 × 9.134 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5400 kN, C0 8700 kN, Pu 620 kN, grease limiting speed 450 r/min, oil 590 r/min, mass about 339000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23272B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23272BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23272B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23272B?",
        "a": "23272B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23272B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5400 kN C / 8700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23272BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23272BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23272b",
      "23272B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23272BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23272BK",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 360,
    "D_mm": 650,
    "B_mm": 232,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5400,
    "static_load_kN": 8700,
    "fatigue_load_limit_kN": 620,
    "limiting_speed_rpm": 450,
    "max_rpm": 450,
    "speed_oil_rpm": 590,
    "weight_g": 329000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23272BK belongs to the 23200 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (23200 series); the bore code resolves to 360 mm (two-digit code ×5, with the 00–03 exception table), and 650 mm OD / 232 mm width follow the general plan. Pu 620 kN is the catalogue fatigue load limit for 23272BK, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. The 145.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 232 mm-wide ring seats fully on both sides. Never mount 23272BK by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 650 mm race.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 360 mm bore 23272BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 450 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23272BK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Oil relubrication toward 590 r/min needs drain and level design; flooding the 232 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 23272BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 5400/8700 kN ratings, 620 kN Pu and 329000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23272BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23272BK?",
        "a": "23272BK is an NTN double-row spherical roller bearing to ISO 15: 360 mm bore, 650 mm OD and 232 mm width (14.173 × 25.591 × 9.134 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5400 kN, C0 8700 kN, Pu 620 kN, grease limiting speed 450 r/min, oil 590 r/min, mass about 329000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23272BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23272B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23272BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23272BK?",
        "a": "23272BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23272BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5400 kN C / 8700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23272B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23272B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23272bk",
      "23272BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23976EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23976EMD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 380,
    "D_mm": 520,
    "B_mm": 106,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2340,
    "static_load_kN": 4000,
    "fatigue_load_limit_kN": 205,
    "limiting_speed_rpm": 710,
    "max_rpm": 710,
    "speed_oil_rpm": 910,
    "weight_g": 68000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 380 mm shaft, NTN supplies 23976EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 910 r/min. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 380 mm (two-digit code ×5, with the 00–03 exception table), and 520 mm OD / 106 mm width follow the general plan. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. Catalogue mass 68000 g (68.00 kg) for the 380×520×106 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 380 mm bore 23976EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 710 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The cylindrical-bore 23976EMD1 and its tapered-bore counterpart 23976EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23976EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Never substitute 23976EMD1 by envelope alone: the 4000 kN C0 and 205 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 2340/4000 kN ratings, 205 kN Pu and 68000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23976EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23976EMD1?",
        "a": "23976EMD1 is an NTN double-row spherical roller bearing to ISO 15: 380 mm bore, 520 mm OD and 106 mm width (14.961 × 20.472 × 4.173 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2340 kN, C0 4000 kN, Pu 205 kN, grease limiting speed 710 r/min, oil 910 r/min, mass about 68000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23976EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23976EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23976EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23976EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23976EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23976EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2340 kN C / 4000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23976EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23976EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23976emd1",
      "＊23976emd1",
      "23976EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23976EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23976EMKD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 380,
    "D_mm": 520,
    "B_mm": 106,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2340,
    "static_load_kN": 4000,
    "fatigue_load_limit_kN": 205,
    "limiting_speed_rpm": 710,
    "max_rpm": 710,
    "speed_oil_rpm": 910,
    "weight_g": 65900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23976EMKD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 380 mm shaft — 2340 kN basic dynamic capacity in a 65900 g, open ISO 15 envelope. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 23976EMKD1 is assembled exactly in that order. Suffix reading on 23976EMKD1: EM identifies the high-capacity execution with a one-piece machined brass cage; K marks the 1:12 tapered bore; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. 380 mm bore is 14.961 in and 520 mm OD is 20.472 in; the ISO 15 envelope swaps between brands, but the 2340/4000 kN ratings and cage design are NTN 2203E values. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 380 mm set.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 380 mm bore 23976EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 910 r/min needs drain and level design; flooding the 106 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 380 mm bearing, and drive-up procedures differ.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23976EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 106 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 2340/4000 kN ratings, 205 kN Pu and 65900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23976EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23976EMKD1?",
        "a": "23976EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 380 mm bore, 520 mm OD and 106 mm width (14.961 × 20.472 × 4.173 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2340 kN, C0 4000 kN, Pu 205 kN, grease limiting speed 710 r/min, oil 910 r/min, mass about 65900 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23976EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23976EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23976EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23976EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23976EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23976EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2340 kN C / 4000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23976EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23976EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23976emkd1",
      "＊23976emkd1",
      "23976EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23076EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23076EMD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 380,
    "D_mm": 560,
    "B_mm": 135,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3230,
    "static_load_kN": 5270,
    "fatigue_load_limit_kN": 247,
    "limiting_speed_rpm": 720,
    "max_rpm": 720,
    "speed_oil_rpm": 910,
    "weight_g": 117000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23076EMD1 denotes the 380 mm bore spherical roller bearing (3230 kN C / 5270 kN C0) in the 23000 series, the self-aligning choice for heavy combined load. Digit by digit the code reads as spherical-roller dimension series plus 380 mm bore; the 135 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. NTN prints two speeds for 23076EMD1: 720 r/min grease and 910 r/min oil — the gap of 190 r/min reflects oil cooling of the heavy roller set. Catalogue mass 117000 g (117.00 kg) for the 380×560×135 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 380 mm bore 23076EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 380 mm bearing, and drive-up procedures differ.",
      "Never substitute 23076EMD1 by envelope alone: the 5270 kN C0 and 247 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23076EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Oil relubrication toward 910 r/min needs drain and level design; flooding the 135 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 3230/5270 kN ratings, 247 kN Pu and 117000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23076EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23076EMD1?",
        "a": "23076EMD1 is an NTN double-row spherical roller bearing to ISO 15: 380 mm bore, 560 mm OD and 135 mm width (14.961 × 22.047 × 5.315 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3230 kN, C0 5270 kN, Pu 247 kN, grease limiting speed 720 r/min, oil 910 r/min, mass about 117000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23076EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23076EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23076EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23076EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23076EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23076EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3230 kN C / 5270 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23076EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23076EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23076emd1",
      "＊23076emd1",
      "23076EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23076EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23076EMKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 380,
    "D_mm": 560,
    "B_mm": 135,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3230,
    "static_load_kN": 5270,
    "fatigue_load_limit_kN": 247,
    "limiting_speed_rpm": 720,
    "max_rpm": 720,
    "speed_oil_rpm": 910,
    "weight_g": 113000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23076EMKD1 denotes the 380 mm bore spherical roller bearing (3230 kN C / 5270 kN C0) in the 23000 series, the self-aligning choice for heavy combined load. Numbering ties 23076EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 380 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The 90.0 mm radial section over the 380 mm bore carries two roller rows; capacity per millimetre of bore is about 8.5 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. The 90.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 135 mm-wide ring seats fully on both sides. Fillet radii on shaft and housing must clear the ring chamfers of the 135 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 380 mm bore 23076EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 380 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 380 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 380 mm bearing, and drive-up procedures differ.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23076EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 3230/5270 kN ratings, 247 kN Pu and 113000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23076EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23076EMKD1?",
        "a": "23076EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 380 mm bore, 560 mm OD and 135 mm width (14.961 × 22.047 × 5.315 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3230 kN, C0 5270 kN, Pu 247 kN, grease limiting speed 720 r/min, oil 910 r/min, mass about 113000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23076EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23076EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23076EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23076EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23076EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23076EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3230 kN C / 5270 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23076EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23076EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23076emkd1",
      "＊23076emkd1",
      "23076EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24076EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24076EMD1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 380,
    "D_mm": 560,
    "B_mm": 180,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 4140,
    "static_load_kN": 7280,
    "fatigue_load_limit_kN": 240,
    "limiting_speed_rpm": 610,
    "max_rpm": 610,
    "speed_oil_rpm": 780,
    "weight_g": 154000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24076EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 380 mm shaft — 4140 kN basic dynamic capacity in a 154000 g, open ISO 15 envelope. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 24076EMD1 is assembled exactly in that order. The 90.0 mm radial section over the 380 mm bore carries two roller rows; capacity per millimetre of bore is about 10.9 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Catalogue mass 154000 g (154.00 kg) for the 380×560×180 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Fit the cylindrical-bore 24076EMD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 380 mm bore 24076EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24076EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Do not confuse EA and EM at the same number: 24076EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 380×560 mm envelope is identical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 180 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The cylindrical-bore 24076EMD1 and its tapered-bore counterpart 24076EMK30D1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 4140/7280 kN ratings, 240 kN Pu and 154000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24076EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24076EMD1?",
        "a": "24076EMD1 is an NTN double-row spherical roller bearing to ISO 15: 380 mm bore, 560 mm OD and 180 mm width (14.961 × 22.047 × 7.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4140 kN, C0 7280 kN, Pu 240 kN, grease limiting speed 610 r/min, oil 780 r/min, mass about 154000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24076EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24076EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24076EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24076EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24076EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24076EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4140 kN C / 7280 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24076EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24076EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24076emd1",
      "＊24076emd1",
      "24076EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24076EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24076EMK30D1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 380,
    "D_mm": 560,
    "B_mm": 180,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 4140,
    "static_load_kN": 7280,
    "fatigue_load_limit_kN": 240,
    "limiting_speed_rpm": 610,
    "max_rpm": 610,
    "speed_oil_rpm": 780,
    "weight_g": 151000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 24076EMK30D1 identifies a 380×560×180 mm (14.961 × 22.047 × 7.087 in) spherical roller bearing, 1:30 tapered bore (K30), to the ISO 15 boundary plan. Numbering ties 24076EMK30D1 to its envelope and execution: same-number EA versus EM or plain variants share the 380 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The 90.0 mm radial section over the 380 mm bore carries two roller rows; capacity per millimetre of bore is about 10.9 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. 380 mm bore is 14.961 in and 560 mm OD is 22.047 in; the ISO 15 envelope swaps between brands, but the 4140/7280 kN ratings and cage design are NTN 2203E values. Fillet radii on shaft and housing must clear the ring chamfers of the 180 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 380 mm bore 24076EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 180 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 380 mm bearing, and drive-up procedures differ.",
      "Never substitute 24076EMK30D1 by envelope alone: the 7280 kN C0 and 240 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 24076EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 4140/7280 kN ratings, 240 kN Pu and 151000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24076EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24076EMK30D1?",
        "a": "24076EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 380 mm bore, 560 mm OD and 180 mm width (14.961 × 22.047 × 7.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4140 kN, C0 7280 kN, Pu 240 kN, grease limiting speed 610 r/min, oil 780 r/min, mass about 151000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 24076EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 380 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24076EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24076EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24076EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24076EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24076EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4140 kN C / 7280 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24076EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24076EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24076emk30d1",
      "＊24076emk30d1",
      "24076EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23176B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23176B",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 380,
    "D_mm": 620,
    "B_mm": 194,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4350,
    "static_load_kN": 7500,
    "fatigue_load_limit_kN": 560,
    "limiting_speed_rpm": 450,
    "max_rpm": 450,
    "speed_oil_rpm": 590,
    "weight_g": 235000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23176B belongs to the 23100 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. Numbering ties 23176B to its envelope and execution: same-number EA versus EM or plain variants share the 380 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. At 4350 kN C and 235000 g mass the 23100 series part is built for shock and vibration; the 194 mm-wide ring needs square abutments to keep both rows equally loaded. Equivalent-load planning keeps a radial plus moderate axial combination on 23176B; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 23176B leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 380 mm bore 23176B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 450 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 380 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 23176B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 450 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 4350/7500 kN ratings, 560 kN Pu and 235000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23176B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23176B?",
        "a": "23176B is an NTN double-row spherical roller bearing to ISO 15: 380 mm bore, 620 mm OD and 194 mm width (14.961 × 24.409 × 7.638 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4350 kN, C0 7500 kN, Pu 560 kN, grease limiting speed 450 r/min, oil 590 r/min, mass about 235000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23176B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23176BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23176B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23176B?",
        "a": "23176B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23176B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4350 kN C / 7500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23176BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23176BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23176b",
      "23176B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23176BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23176BK",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 380,
    "D_mm": 620,
    "B_mm": 194,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4350,
    "static_load_kN": 7500,
    "fatigue_load_limit_kN": 560,
    "limiting_speed_rpm": 450,
    "max_rpm": 450,
    "speed_oil_rpm": 590,
    "weight_g": 228000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23176BK denotes the 380 mm bore spherical roller bearing (4350 kN C / 7500 kN C0) in the 23100 series, the self-aligning choice for heavy combined load. Digit by digit the code reads as spherical-roller dimension series plus 380 mm bore; the 194 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Catalogue mass 228000 g (228.00 kg) for the 380×620×194 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 380 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 380 mm bore 23176BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 23176BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 23176BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23176BK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23176BK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 4350/7500 kN ratings, 560 kN Pu and 228000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23176BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23176BK?",
        "a": "23176BK is an NTN double-row spherical roller bearing to ISO 15: 380 mm bore, 620 mm OD and 194 mm width (14.961 × 24.409 × 7.638 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4350 kN, C0 7500 kN, Pu 560 kN, grease limiting speed 450 r/min, oil 590 r/min, mass about 228000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23176BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23176B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23176BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23176BK?",
        "a": "23176BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23176BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4350 kN C / 7500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23176B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23176B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23176bk",
      "23176BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24176B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24176B",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 380,
    "D_mm": 620,
    "B_mm": 243,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5350,
    "static_load_kN": 9650,
    "fatigue_load_limit_kN": 570,
    "limiting_speed_rpm": 450,
    "max_rpm": 450,
    "speed_oil_rpm": 590,
    "weight_g": 292000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24176B is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 380×620×243 mm to ISO 15, with pressed-steel cage (standard execution). The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 380 mm (two-digit code ×5, with the 00–03 exception table), and 620 mm OD / 243 mm width follow the general plan. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. 380 mm bore is 14.961 in and 620 mm OD is 24.409 in; the ISO 15 envelope swaps between brands, but the 5350/9650 kN ratings and cage design are NTN 2203E values. Fillet radii on shaft and housing must clear the ring chamfers of the 243 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 380 mm bore 24176B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The cylindrical-bore 24176B and its tapered-bore counterpart 24176BK30 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Do not confuse EA and EM at the same number: 24176B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 380×620 mm envelope is identical.",
      "Do not confuse EA and EM at the same number: 24176B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 380×620 mm envelope is identical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24176B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 5350/9650 kN ratings, 570 kN Pu and 292000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24176B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24176B?",
        "a": "24176B is an NTN double-row spherical roller bearing to ISO 15: 380 mm bore, 620 mm OD and 243 mm width (14.961 × 24.409 × 9.567 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5350 kN, C0 9650 kN, Pu 570 kN, grease limiting speed 450 r/min, oil 590 r/min, mass about 292000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24176B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24176BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24176B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24176B?",
        "a": "24176B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24176B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5350 kN C / 9650 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24176BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24176BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24176b",
      "24176B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24176BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24176BK30",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 380,
    "D_mm": 620,
    "B_mm": 243,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5350,
    "static_load_kN": 9650,
    "fatigue_load_limit_kN": 570,
    "limiting_speed_rpm": 450,
    "max_rpm": 450,
    "speed_oil_rpm": 590,
    "weight_g": 287000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 24176BK30 denotes the 380 mm bore spherical roller bearing (5350 kN C / 9650 kN C0) in the 24100 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 380 mm (two-digit code ×5, with the 00–03 exception table), and 620 mm OD / 243 mm width follow the general plan. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the basic cage. 380 mm bore is 14.961 in and 620 mm OD is 24.409 in; the ISO 15 envelope swaps between brands, but the 5350/9650 kN ratings and cage design are NTN 2203E values. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 380 mm bore 24176BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 24176BK30 carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 380×620 mm envelope is identical.",
      "Do not confuse EA and EM at the same number: 24176BK30 carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 380×620 mm envelope is identical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 450 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Never substitute 24176BK30 by envelope alone: the 9650 kN C0 and 570 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The 5350/9650 kN ratings, 570 kN Pu and 287000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24176BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24176BK30?",
        "a": "24176BK30 is an NTN double-row spherical roller bearing to ISO 15: 380 mm bore, 620 mm OD and 243 mm width (14.961 × 24.409 × 9.567 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5350 kN, C0 9650 kN, Pu 570 kN, grease limiting speed 450 r/min, oil 590 r/min, mass about 287000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24176BK30 mounts on a matching adapter or withdrawal sleeve on a plain 380 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24176B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24176BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24176BK30?",
        "a": "24176BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24176BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5350 kN C / 9650 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24176B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24176B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24176bk30",
      "24176BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23276B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23276B",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 380,
    "D_mm": 680,
    "B_mm": 240,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5800,
    "static_load_kN": 9650,
    "fatigue_load_limit_kN": 665,
    "limiting_speed_rpm": 430,
    "max_rpm": 430,
    "speed_oil_rpm": 550,
    "weight_g": 380000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 380 mm shaft, NTN supplies 23276B: sphered outer raceway, two roller rows, pressed-steel cage (standard execution), oil speed 550 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (cylindrical), lubrication feature (none); 23276B is assembled exactly in that order. Two symmetric roller rows share the load: C 5800 kN, C0 9650 kN (C0/C ≈ 1.66), with useful axial capacity in either direction alongside the dominant radial load. Selection: the C0/C ratio of 1.66 (9650/5800 kN) reflects the heavy static and shock proportioning of 23276B; size the equivalent load at the required L10 with shock factor for the application. Fillet radii on shaft and housing must clear the ring chamfers of the 240 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 380 mm bore 23276B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 240 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 380 mm bearing, and drive-up procedures differ.",
      "Do not confuse EA and EM at the same number: 23276B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 380×680 mm envelope is identical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 380 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The 5800/9650 kN ratings, 665 kN Pu and 380000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23276B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23276B?",
        "a": "23276B is an NTN double-row spherical roller bearing to ISO 15: 380 mm bore, 680 mm OD and 240 mm width (14.961 × 26.772 × 9.449 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5800 kN, C0 9650 kN, Pu 665 kN, grease limiting speed 430 r/min, oil 550 r/min, mass about 380000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23276B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23276BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23276B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23276B?",
        "a": "23276B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23276B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5800 kN C / 9650 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23276BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23276BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23276b",
      "23276B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23276BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23276BK",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 380,
    "D_mm": 680,
    "B_mm": 240,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5800,
    "static_load_kN": 9650,
    "fatigue_load_limit_kN": 665,
    "limiting_speed_rpm": 430,
    "max_rpm": 430,
    "speed_oil_rpm": 550,
    "weight_g": 369000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23276BK is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 380×680×240 mm to ISO 15, with pressed-steel cage (standard execution). Reading the full code: the number gives the 380×680 mm envelope, — names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. The 150.0 mm radial section over the 380 mm bore carries two roller rows; capacity per millimetre of bore is about 15.3 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Pu 665 kN against C0 9650 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23276BK moves with cleanliness far more than with small C variations. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 380 mm set.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 380 mm bore 23276BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23276BK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 380 mm bearing, and drive-up procedures differ.",
      "Never substitute 23276BK by envelope alone: the 9650 kN C0 and 665 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23276B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 5800/9650 kN ratings, 665 kN Pu and 369000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23276BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23276BK?",
        "a": "23276BK is an NTN double-row spherical roller bearing to ISO 15: 380 mm bore, 680 mm OD and 240 mm width (14.961 × 26.772 × 9.449 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5800 kN, C0 9650 kN, Pu 665 kN, grease limiting speed 430 r/min, oil 550 r/min, mass about 369000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23276BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23276B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23276BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23276BK?",
        "a": "23276BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23276BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5800 kN C / 9650 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23276B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23276B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23276bk",
      "23276BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23980EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23980EMD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 400,
    "D_mm": 540,
    "B_mm": 106,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2370,
    "static_load_kN": 4170,
    "fatigue_load_limit_kN": 215,
    "limiting_speed_rpm": 680,
    "max_rpm": 680,
    "speed_oil_rpm": 870,
    "weight_g": 71400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23980EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 400 mm bore, 540 mm OD, 106 mm width, rated 680 r/min on grease. Digit by digit the code reads as spherical-roller dimension series plus 400 mm bore; the 106 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Equivalent-load planning keeps a radial plus moderate axial combination on 23980EMD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 400 mm set.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 400 mm bore 23980EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 870 r/min needs drain and level design; flooding the 106 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 400 mm bearing, and drive-up procedures differ.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 400 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 400 mm bearing, and drive-up procedures differ.",
      "The 2370/4170 kN ratings, 215 kN Pu and 71400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23980EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23980EMD1?",
        "a": "23980EMD1 is an NTN double-row spherical roller bearing to ISO 15: 400 mm bore, 540 mm OD and 106 mm width (15.748 × 21.26 × 4.173 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2370 kN, C0 4170 kN, Pu 215 kN, grease limiting speed 680 r/min, oil 870 r/min, mass about 71400 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23980EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23980EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23980EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23980EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23980EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23980EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2370 kN C / 4170 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23980EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23980EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23980emd1",
      "＊23980emd1",
      "23980EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23980EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23980EMKD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 400,
    "D_mm": 540,
    "B_mm": 106,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2370,
    "static_load_kN": 4170,
    "fatigue_load_limit_kN": 215,
    "limiting_speed_rpm": 680,
    "max_rpm": 680,
    "speed_oil_rpm": 870,
    "weight_g": 69200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23980EMKD1 denotes the 400 mm bore spherical roller bearing (2370 kN C / 4170 kN C0) in the 23900 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 400 mm (two-digit code ×5, with the 00–03 exception table), and 540 mm OD / 106 mm width follow the general plan. Two symmetric roller rows share the load: C 2370 kN, C0 4170 kN (C0/C ≈ 1.76), with useful axial capacity in either direction alongside the dominant radial load. Speed planning: 680 r/min grease limiting speed is the cage/kinematic ceiling and 870 r/min is the oil-lubricated value for the 400 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Mount 23980EMKD1 on its adapter or withdrawal sleeve on the 400 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 400 mm bore 23980EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 680 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 680 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 2370 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 400 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The 2370/4170 kN ratings, 215 kN Pu and 69200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23980EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23980EMKD1?",
        "a": "23980EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 400 mm bore, 540 mm OD and 106 mm width (15.748 × 21.26 × 4.173 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2370 kN, C0 4170 kN, Pu 215 kN, grease limiting speed 680 r/min, oil 870 r/min, mass about 69200 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23980EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23980EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23980EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23980EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23980EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23980EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2370 kN C / 4170 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23980EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23980EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23980emkd1",
      "＊23980emkd1",
      "23980EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23080B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23080B",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 400,
    "D_mm": 600,
    "B_mm": 148,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 3300,
    "static_load_kN": 6050,
    "fatigue_load_limit_kN": 450,
    "limiting_speed_rpm": 520,
    "max_rpm": 520,
    "speed_oil_rpm": 680,
    "weight_g": 149000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23080B belongs to the 23000 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. Digit by digit the code reads as spherical-roller dimension series plus 400 mm bore; the 148 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The cylindrical bore fits a machined 400 mm shaft seat directly; the same envelope in 23080BK (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Pu 450 kN against C0 6050 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23080B moves with cleanliness far more than with small C variations. Fit the cylindrical-bore 23080B with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 400 mm bore 23080B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The cylindrical-bore 23080B and its tapered-bore counterpart 23080BK share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Oil relubrication toward 680 r/min needs drain and level design; flooding the 148 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 400 mm bearing, and drive-up procedures differ.",
      "Do not confuse EA and EM at the same number: 23080B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 400×600 mm envelope is identical.",
      "The 3300/6050 kN ratings, 450 kN Pu and 149000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23080B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23080B?",
        "a": "23080B is an NTN double-row spherical roller bearing to ISO 15: 400 mm bore, 600 mm OD and 148 mm width (15.748 × 23.622 × 5.827 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3300 kN, C0 6050 kN, Pu 450 kN, grease limiting speed 520 r/min, oil 680 r/min, mass about 149000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23080B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23080BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23080B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23080B?",
        "a": "23080B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23080B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3300 kN C / 6050 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23080BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23080BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23080b",
      "23080B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23080BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23080BK",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 400,
    "D_mm": 600,
    "B_mm": 148,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 3300,
    "static_load_kN": 6050,
    "fatigue_load_limit_kN": 450,
    "limiting_speed_rpm": 520,
    "max_rpm": 520,
    "speed_oil_rpm": 680,
    "weight_g": 144000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23080BK identifies a 400×600×148 mm (15.748 × 23.622 × 5.827 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (K), lubrication feature (none); 23080BK is assembled exactly in that order. NTN prints two speeds for 23080BK: 520 r/min grease and 680 r/min oil — the gap of 160 r/min reflects oil cooling of the heavy roller set. 400 mm bore is 15.748 in and 600 mm OD is 23.622 in; the ISO 15 envelope swaps between brands, but the 3300/6050 kN ratings and cage design are NTN 2203E values. Never mount 23080BK by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 600 mm race.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 400 mm bore 23080BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 680 r/min needs drain and level design; flooding the 148 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 400 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23080B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Oil relubrication toward 680 r/min needs drain and level design; flooding the 148 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 3300/6050 kN ratings, 450 kN Pu and 144000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23080BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23080BK?",
        "a": "23080BK is an NTN double-row spherical roller bearing to ISO 15: 400 mm bore, 600 mm OD and 148 mm width (15.748 × 23.622 × 5.827 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3300 kN, C0 6050 kN, Pu 450 kN, grease limiting speed 520 r/min, oil 680 r/min, mass about 144000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23080BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23080B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23080BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23080BK?",
        "a": "23080BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23080BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3300 kN C / 6050 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23080B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23080B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23080bk",
      "23080BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24080B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24080B",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 400,
    "D_mm": 600,
    "B_mm": 200,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4250,
    "static_load_kN": 8400,
    "fatigue_load_limit_kN": 485,
    "limiting_speed_rpm": 460,
    "max_rpm": 460,
    "speed_oil_rpm": 600,
    "weight_g": 202000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24080B is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 400×600×200 mm to ISO 15, with pressed-steel cage (standard execution). Reading the full code: the number gives the 400×600 mm envelope, — names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and plain outer ring (no D1/W33 groove) completes the order number. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Speed planning: 460 r/min grease limiting speed is the cage/kinematic ceiling and 600 r/min is the oil-lubricated value for the 400 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Fit the cylindrical-bore 24080B with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 400 mm bore 24080B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 24080B by envelope alone: the 8400 kN C0 and 485 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 400 mm bearing, and drive-up procedures differ.",
      "Oil relubrication toward 600 r/min needs drain and level design; flooding the 200 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24080B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 4250/8400 kN ratings, 485 kN Pu and 202000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24080B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24080B?",
        "a": "24080B is an NTN double-row spherical roller bearing to ISO 15: 400 mm bore, 600 mm OD and 200 mm width (15.748 × 23.622 × 7.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4250 kN, C0 8400 kN, Pu 485 kN, grease limiting speed 460 r/min, oil 600 r/min, mass about 202000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24080B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24080BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24080B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24080B?",
        "a": "24080B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24080B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4250 kN C / 8400 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24080BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24080BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24080b",
      "24080B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24080BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24080BK30",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 400,
    "D_mm": 600,
    "B_mm": 200,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4250,
    "static_load_kN": 8400,
    "fatigue_load_limit_kN": 485,
    "limiting_speed_rpm": 460,
    "max_rpm": 460,
    "speed_oil_rpm": 600,
    "weight_g": 200000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24080BK30 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 400×600×200 mm to ISO 15, with pressed-steel cage (standard execution). On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (K30), lubrication feature (none); 24080BK30 is assembled exactly in that order. Two symmetric roller rows share the load: C 4250 kN, C0 8400 kN (C0/C ≈ 1.98), with useful axial capacity in either direction alongside the dominant radial load. 400 mm bore is 15.748 in and 600 mm OD is 23.622 in; the ISO 15 envelope swaps between brands, but the 4250/8400 kN ratings and cage design are NTN 2203E values. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 400 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 400 mm bore 24080BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 24080BK30 by envelope alone: the 8400 kN C0 and 485 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Never substitute 24080BK30 by envelope alone: the 8400 kN C0 and 485 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 460 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 400 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The 4250/8400 kN ratings, 485 kN Pu and 200000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24080BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24080BK30?",
        "a": "24080BK30 is an NTN double-row spherical roller bearing to ISO 15: 400 mm bore, 600 mm OD and 200 mm width (15.748 × 23.622 × 7.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4250 kN, C0 8400 kN, Pu 485 kN, grease limiting speed 460 r/min, oil 600 r/min, mass about 200000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 24080BK30 mounts on a matching adapter or withdrawal sleeve on a plain 400 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24080B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24080BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24080BK30?",
        "a": "24080BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24080BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4250 kN C / 8400 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24080B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24080B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24080bk30",
      "24080BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23180B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23180B",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 400,
    "D_mm": 650,
    "B_mm": 200,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4650,
    "static_load_kN": 8050,
    "fatigue_load_limit_kN": 630,
    "limiting_speed_rpm": 430,
    "max_rpm": 430,
    "speed_oil_rpm": 560,
    "weight_g": 264000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 400 mm shaft, NTN supplies 23180B: sphered outer raceway, two roller rows, pressed-steel cage (standard execution), oil speed 560 r/min. The leading digits are the ISO 15 dimension series (23100 series); the bore code resolves to 400 mm (two-digit code ×5, with the 00–03 exception table), and 650 mm OD / 200 mm width follow the general plan. Open by design, 23180B requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. With about 11.6 kN of C per millimetre of the 400 mm bore, 23180B screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 400 mm set.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 400 mm bore 23180B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 23180B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 400×650 mm envelope is identical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 23180B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The cylindrical-bore 23180B and its tapered-bore counterpart 23180BK share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 4650 kN rating no longer applies.",
      "The 4650/8050 kN ratings, 630 kN Pu and 264000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23180B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23180B?",
        "a": "23180B is an NTN double-row spherical roller bearing to ISO 15: 400 mm bore, 650 mm OD and 200 mm width (15.748 × 25.591 × 7.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4650 kN, C0 8050 kN, Pu 630 kN, grease limiting speed 430 r/min, oil 560 r/min, mass about 264000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23180B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23180BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23180B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23180B?",
        "a": "23180B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23180B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4650 kN C / 8050 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23180BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23180BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23180b",
      "23180B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23180BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23180BK",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 400,
    "D_mm": 650,
    "B_mm": 200,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4650,
    "static_load_kN": 8050,
    "fatigue_load_limit_kN": 630,
    "limiting_speed_rpm": 430,
    "max_rpm": 430,
    "speed_oil_rpm": 560,
    "weight_g": 256000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23180BK belongs to the 23100 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. Numbering ties 23180BK to its envelope and execution: same-number EA versus EM or plain variants share the 400 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. At 4650 kN C and 256000 g mass the 23100 series part is built for shock and vibration; the 200 mm-wide ring needs square abutments to keep both rows equally loaded. With about 11.6 kN of C per millimetre of the 400 mm bore, 23180BK screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Never mount 23180BK by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 650 mm race.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 400 mm bore 23180BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 4650 kN rating no longer applies.",
      "Do not confuse EA and EM at the same number: 23180BK carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 400×650 mm envelope is identical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23180BK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 430 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 4650/8050 kN ratings, 630 kN Pu and 256000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23180BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23180BK?",
        "a": "23180BK is an NTN double-row spherical roller bearing to ISO 15: 400 mm bore, 650 mm OD and 200 mm width (15.748 × 25.591 × 7.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4650 kN, C0 8050 kN, Pu 630 kN, grease limiting speed 430 r/min, oil 560 r/min, mass about 256000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23180BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23180B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23180BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23180BK?",
        "a": "23180BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23180BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4650 kN C / 8050 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23180B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23180B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23180bk",
      "23180BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24180B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24180B",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 400,
    "D_mm": 650,
    "B_mm": 250,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5650,
    "static_load_kN": 10300,
    "fatigue_load_limit_kN": 585,
    "limiting_speed_rpm": 430,
    "max_rpm": 430,
    "speed_oil_rpm": 560,
    "weight_g": 329000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 24180B identifies a 400×650×250 mm (15.748 × 25.591 × 9.843 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 400 mm bore; the 250 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The 125.0 mm radial section over the 400 mm bore carries two roller rows; capacity per millimetre of bore is about 14.1 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Catalogue mass 329000 g (329.00 kg) for the 400×650×250 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 400 mm set.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 400 mm bore 24180B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 430 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 430 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24180B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The cylindrical-bore 24180B and its tapered-bore counterpart 24180BK30 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 5650/10300 kN ratings, 585 kN Pu and 329000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24180B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24180B?",
        "a": "24180B is an NTN double-row spherical roller bearing to ISO 15: 400 mm bore, 650 mm OD and 250 mm width (15.748 × 25.591 × 9.843 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5650 kN, C0 10300 kN, Pu 585 kN, grease limiting speed 430 r/min, oil 560 r/min, mass about 329000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24180B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24180BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24180B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24180B?",
        "a": "24180B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24180B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5650 kN C / 10300 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24180BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24180BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24180b",
      "24180B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24180BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24180BK30",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 400,
    "D_mm": 650,
    "B_mm": 250,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5650,
    "static_load_kN": 10300,
    "fatigue_load_limit_kN": 585,
    "limiting_speed_rpm": 430,
    "max_rpm": 430,
    "speed_oil_rpm": 560,
    "weight_g": 324000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24180BK30 belongs to the 24100 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 400 mm (two-digit code ×5, with the 00–03 exception table), and 650 mm OD / 250 mm width follow the general plan. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Equivalent-load planning keeps a radial plus moderate axial combination on 24180BK30; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 400 mm set.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 400 mm bore 24180BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 24180B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 24180BK30 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 250 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 400 mm bearing, and drive-up procedures differ.",
      "The 5650/10300 kN ratings, 585 kN Pu and 324000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24180BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24180BK30?",
        "a": "24180BK30 is an NTN double-row spherical roller bearing to ISO 15: 400 mm bore, 650 mm OD and 250 mm width (15.748 × 25.591 × 9.843 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5650 kN, C0 10300 kN, Pu 585 kN, grease limiting speed 430 r/min, oil 560 r/min, mass about 324000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24180BK30 mounts on a matching adapter or withdrawal sleeve on a plain 400 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24180B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24180BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24180BK30?",
        "a": "24180BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24180BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5650 kN C / 10300 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24180B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24180B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24180bk30",
      "24180BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23280B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23280B",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 400,
    "D_mm": 720,
    "B_mm": 256,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 6500,
    "static_load_kN": 10600,
    "fatigue_load_limit_kN": 740,
    "limiting_speed_rpm": 400,
    "max_rpm": 400,
    "speed_oil_rpm": 520,
    "weight_g": 457000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23280B with a cylindrical bore and plain outer ring (no D1/W33 groove): 400 mm bore, 720 mm OD, 256 mm width, rated 400 r/min on grease. Numbering ties 23280B to its envelope and execution: same-number EA versus EM or plain variants share the 400 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Suffix reading on 23280B: the bare number is the standard open execution; B marks the standard large-bore internal design on slash-size 230–232 series; quote the full code because each suffix is a distinct article. Grease/oil ratio: the 400 r/min limiting value is .77 of the 520 r/min oil value; heavy 256 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 23280B leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 400 mm bore 23280B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 400 mm bearing, and drive-up procedures differ.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 256 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 400 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 256 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 6500/10600 kN ratings, 740 kN Pu and 457000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23280B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23280B?",
        "a": "23280B is an NTN double-row spherical roller bearing to ISO 15: 400 mm bore, 720 mm OD and 256 mm width (15.748 × 28.346 × 10.079 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 6500 kN, C0 10600 kN, Pu 740 kN, grease limiting speed 400 r/min, oil 520 r/min, mass about 457000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23280B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23280BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23280B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23280B?",
        "a": "23280B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23280B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 6500 kN C / 10600 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23280BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23280BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23280b",
      "23280B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23280BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23280BK",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 400,
    "D_mm": 720,
    "B_mm": 256,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 6500,
    "static_load_kN": 10600,
    "fatigue_load_limit_kN": 740,
    "limiting_speed_rpm": 400,
    "max_rpm": 400,
    "speed_oil_rpm": 520,
    "weight_g": 443000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23280BK is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 400×720×256 mm to ISO 15, with pressed-steel cage (standard execution). The leading digits are the ISO 15 dimension series (23200 series); the bore code resolves to 400 mm (two-digit code ×5, with the 00–03 exception table), and 720 mm OD / 256 mm width follow the general plan. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Catalogue mass 443000 g (443.00 kg) for the 400×720×256 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Never mount 23280BK by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 720 mm race.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 400 mm bore 23280BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 400 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 6500 kN rating no longer applies.",
      "Never substitute 23280BK by envelope alone: the 10600 kN C0 and 740 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 400 mm bearing, and drive-up procedures differ.",
      "The 6500/10600 kN ratings, 740 kN Pu and 443000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23280BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23280BK?",
        "a": "23280BK is an NTN double-row spherical roller bearing to ISO 15: 400 mm bore, 720 mm OD and 256 mm width (15.748 × 28.346 × 10.079 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 6500 kN, C0 10600 kN, Pu 740 kN, grease limiting speed 400 r/min, oil 520 r/min, mass about 443000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23280BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23280B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23280BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23280BK?",
        "a": "23280BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23280BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 6500 kN C / 10600 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23280B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23280B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23280bk",
      "23280BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23984EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23984EMD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 420,
    "D_mm": 560,
    "B_mm": 106,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2390,
    "static_load_kN": 4320,
    "fatigue_load_limit_kN": 230,
    "limiting_speed_rpm": 650,
    "max_rpm": 650,
    "speed_oil_rpm": 830,
    "weight_g": 74900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23984EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 420 mm bore, 560 mm OD, 106 mm width, rated 650 r/min on grease. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 420 mm (two-digit code ×5, with the 00–03 exception table), and 560 mm OD / 106 mm width follow the general plan. The 70.0 mm radial section over the 420 mm bore carries two roller rows; capacity per millimetre of bore is about 5.7 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Catalogue mass 74900 g (74.90 kg) for the 420×560×106 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 23984EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 420 mm bore 23984EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23984EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 650 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23984EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The cylindrical-bore 23984EMD1 and its tapered-bore counterpart 23984EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 2390/4320 kN ratings, 230 kN Pu and 74900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23984EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23984EMD1?",
        "a": "23984EMD1 is an NTN double-row spherical roller bearing to ISO 15: 420 mm bore, 560 mm OD and 106 mm width (16.535 × 22.047 × 4.173 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2390 kN, C0 4320 kN, Pu 230 kN, grease limiting speed 650 r/min, oil 830 r/min, mass about 74900 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23984EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23984EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23984EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23984EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23984EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23984EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2390 kN C / 4320 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23984EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23984EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23984emd1",
      "＊23984emd1",
      "23984EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23984EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23984EMKD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 420,
    "D_mm": 560,
    "B_mm": 106,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2390,
    "static_load_kN": 4320,
    "fatigue_load_limit_kN": 230,
    "limiting_speed_rpm": 650,
    "max_rpm": 650,
    "speed_oil_rpm": 830,
    "weight_g": 72600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23984EMKD1 belongs to the 23900 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 420 mm (two-digit code ×5, with the 00–03 exception table), and 560 mm OD / 106 mm width follow the general plan. Suffix reading on 23984EMKD1: EM identifies the high-capacity execution with a one-piece machined brass cage; K marks the 1:12 tapered bore; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. The 70.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 106 mm-wide ring seats fully on both sides. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 420 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 420 mm bore 23984EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 420 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 650 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23984EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 106 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 2390/4320 kN ratings, 230 kN Pu and 72600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23984EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23984EMKD1?",
        "a": "23984EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 420 mm bore, 560 mm OD and 106 mm width (16.535 × 22.047 × 4.173 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2390 kN, C0 4320 kN, Pu 230 kN, grease limiting speed 650 r/min, oil 830 r/min, mass about 72600 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23984EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23984EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23984EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23984EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23984EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23984EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2390 kN C / 4320 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23984EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23984EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23984emkd1",
      "＊23984emkd1",
      "23984EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23084B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23084B",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 420,
    "D_mm": 620,
    "B_mm": 150,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 3450,
    "static_load_kN": 6400,
    "fatigue_load_limit_kN": 475,
    "limiting_speed_rpm": 490,
    "max_rpm": 490,
    "speed_oil_rpm": 640,
    "weight_g": 157000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 420 mm shaft, NTN supplies 23084B: sphered outer raceway, two roller rows, pressed-steel cage (standard execution), oil speed 640 r/min. The leading digits are the ISO 15 dimension series (23000 series); the bore code resolves to 420 mm (two-digit code ×5, with the 00–03 exception table), and 620 mm OD / 150 mm width follow the general plan. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Grease/oil ratio: the 490 r/min limiting value is .77 of the 640 r/min oil value; heavy 150 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Never mount 23084B by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 620 mm race.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 420 mm bore 23084B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 640 r/min needs drain and level design; flooding the 150 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 420 mm bearing, and drive-up procedures differ.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 420 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 420 mm bearing, and drive-up procedures differ.",
      "The 3450/6400 kN ratings, 475 kN Pu and 157000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23084B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23084B?",
        "a": "23084B is an NTN double-row spherical roller bearing to ISO 15: 420 mm bore, 620 mm OD and 150 mm width (16.535 × 24.409 × 5.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3450 kN, C0 6400 kN, Pu 475 kN, grease limiting speed 490 r/min, oil 640 r/min, mass about 157000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23084B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23084BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23084B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23084B?",
        "a": "23084B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23084B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3450 kN C / 6400 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23084BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23084BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23084b",
      "23084B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23084BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23084BK",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 420,
    "D_mm": 620,
    "B_mm": 150,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 3450,
    "static_load_kN": 6400,
    "fatigue_load_limit_kN": 475,
    "limiting_speed_rpm": 490,
    "max_rpm": 490,
    "speed_oil_rpm": 640,
    "weight_g": 152000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23084BK denotes the 420 mm bore spherical roller bearing (3450 kN C / 6400 kN C0) in the 23000 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (23000 series); the bore code resolves to 420 mm (two-digit code ×5, with the 00–03 exception table), and 620 mm OD / 150 mm width follow the general plan. The 100.0 mm radial section over the 420 mm bore carries two roller rows; capacity per millimetre of bore is about 8.2 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. The 100.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 150 mm-wide ring seats fully on both sides. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 420 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 420 mm bore 23084BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 23084BK carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 420×620 mm envelope is identical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 150 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 490 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23084B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 3450/6400 kN ratings, 475 kN Pu and 152000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23084BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23084BK?",
        "a": "23084BK is an NTN double-row spherical roller bearing to ISO 15: 420 mm bore, 620 mm OD and 150 mm width (16.535 × 24.409 × 5.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3450 kN, C0 6400 kN, Pu 475 kN, grease limiting speed 490 r/min, oil 640 r/min, mass about 152000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23084BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23084B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23084BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23084BK?",
        "a": "23084BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23084BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3450 kN C / 6400 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23084B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23084B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23084bk",
      "23084BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24084B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24084B",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 420,
    "D_mm": 620,
    "B_mm": 200,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4300,
    "static_load_kN": 8450,
    "fatigue_load_limit_kN": 470,
    "limiting_speed_rpm": 440,
    "max_rpm": 440,
    "speed_oil_rpm": 570,
    "weight_g": 210000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 24084B identifies a 420×620×200 mm (16.535 × 24.409 × 7.874 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 420 mm bore; the 200 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Two symmetric roller rows share the load: C 4300 kN, C0 8450 kN (C0/C ≈ 1.97), with useful axial capacity in either direction alongside the dominant radial load. 420 mm bore is 16.535 in and 620 mm OD is 24.409 in; the ISO 15 envelope swaps between brands, but the 4300/8450 kN ratings and cage design are NTN 2203E values. Never mount 24084B by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 620 mm race.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 420 mm bore 24084B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 4300 kN rating no longer applies.",
      "Never substitute 24084B by envelope alone: the 8450 kN C0 and 470 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 440 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 420 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The 4300/8450 kN ratings, 470 kN Pu and 210000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24084B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24084B?",
        "a": "24084B is an NTN double-row spherical roller bearing to ISO 15: 420 mm bore, 620 mm OD and 200 mm width (16.535 × 24.409 × 7.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4300 kN, C0 8450 kN, Pu 470 kN, grease limiting speed 440 r/min, oil 570 r/min, mass about 210000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24084B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24084BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24084B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24084B?",
        "a": "24084B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24084B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4300 kN C / 8450 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24084BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24084BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24084b",
      "24084B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24084BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24084BK30",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 420,
    "D_mm": 620,
    "B_mm": 200,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4300,
    "static_load_kN": 8450,
    "fatigue_load_limit_kN": 470,
    "limiting_speed_rpm": 440,
    "max_rpm": 440,
    "speed_oil_rpm": 570,
    "weight_g": 207000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24084BK30 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 420×620×200 mm to ISO 15, with pressed-steel cage (standard execution). On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (K30), lubrication feature (none); 24084BK30 is assembled exactly in that order. Suffix reading on 24084BK30: the bare number is the standard open execution; K30 marks the 1:30 tapered bore of the wide series; B marks the standard large-bore internal design on slash-size 230–232 series; quote the full code because each suffix is a distinct article. Catalogue mass 207000 g (207.00 kg) for the 420×620×200 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 420 mm bore 24084BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24084BK30 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 420 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Never substitute 24084BK30 by envelope alone: the 8450 kN C0 and 470 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 200 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 4300/8450 kN ratings, 470 kN Pu and 207000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24084BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24084BK30?",
        "a": "24084BK30 is an NTN double-row spherical roller bearing to ISO 15: 420 mm bore, 620 mm OD and 200 mm width (16.535 × 24.409 × 7.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4300 kN, C0 8450 kN, Pu 470 kN, grease limiting speed 440 r/min, oil 570 r/min, mass about 207000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 24084BK30 mounts on a matching adapter or withdrawal sleeve on a plain 420 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24084B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24084BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24084BK30?",
        "a": "24084BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24084BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4300 kN C / 8450 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24084B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24084B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24084bk30",
      "24084BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23184B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23184B",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 420,
    "D_mm": 700,
    "B_mm": 224,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5800,
    "static_load_kN": 9950,
    "fatigue_load_limit_kN": 680,
    "limiting_speed_rpm": 410,
    "max_rpm": 410,
    "speed_oil_rpm": 530,
    "weight_g": 354000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23184B with a cylindrical bore and plain outer ring (no D1/W33 groove): 420 mm bore, 700 mm OD, 224 mm width, rated 410 r/min on grease. Numbering ties 23184B to its envelope and execution: same-number EA versus EM or plain variants share the 420 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the basic cage. The 140.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 224 mm-wide ring seats fully on both sides. Fit the cylindrical-bore 23184B with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 420 mm bore 23184B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The cylindrical-bore 23184B and its tapered-bore counterpart 23184BK share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 410 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 224 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 23184B by envelope alone: the 9950 kN C0 and 680 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The 5800/9950 kN ratings, 680 kN Pu and 354000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23184B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23184B?",
        "a": "23184B is an NTN double-row spherical roller bearing to ISO 15: 420 mm bore, 700 mm OD and 224 mm width (16.535 × 27.559 × 8.819 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5800 kN, C0 9950 kN, Pu 680 kN, grease limiting speed 410 r/min, oil 530 r/min, mass about 354000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23184B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23184BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23184B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23184B?",
        "a": "23184B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23184B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5800 kN C / 9950 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23184BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23184BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23184b",
      "23184B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23184BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23184BK",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 420,
    "D_mm": 700,
    "B_mm": 224,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5800,
    "static_load_kN": 9950,
    "fatigue_load_limit_kN": 680,
    "limiting_speed_rpm": 410,
    "max_rpm": 410,
    "speed_oil_rpm": 530,
    "weight_g": 343000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23184BK is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 420×700×224 mm to ISO 15, with pressed-steel cage (standard execution). Digit by digit the code reads as spherical-roller dimension series plus 420 mm bore; the 224 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Pu 680 kN is the catalogue fatigue load limit for 23184BK, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Equivalent-load planning keeps a radial plus moderate axial combination on 23184BK; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 420 mm set.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 420 mm bore 23184BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 410 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 410 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 23184BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 23184BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 5800/9950 kN ratings, 680 kN Pu and 343000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23184BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23184BK?",
        "a": "23184BK is an NTN double-row spherical roller bearing to ISO 15: 420 mm bore, 700 mm OD and 224 mm width (16.535 × 27.559 × 8.819 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5800 kN, C0 9950 kN, Pu 680 kN, grease limiting speed 410 r/min, oil 530 r/min, mass about 343000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23184BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23184B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23184BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23184BK?",
        "a": "23184BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23184BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5800 kN C / 9950 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23184B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23184B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23184bk",
      "23184BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24184B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24184B",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 420,
    "D_mm": 700,
    "B_mm": 280,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 6850,
    "static_load_kN": 12200,
    "fatigue_load_limit_kN": 755,
    "limiting_speed_rpm": 410,
    "max_rpm": 410,
    "speed_oil_rpm": 530,
    "weight_g": 440000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24184B is the basic execution of NTN's spherical roller range for a 420 mm shaft — 6850 kN basic dynamic capacity in a 440000 g, open ISO 15 envelope. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 420 mm (two-digit code ×5, with the 00–03 exception table), and 700 mm OD / 280 mm width follow the general plan. The cylindrical bore fits a machined 420 mm shaft seat directly; the same envelope in 24184BK30 (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Equivalent-load planning keeps a radial plus moderate axial combination on 24184B; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Fit the cylindrical-bore 24184B with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 420 mm bore 24184B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 24184B by envelope alone: the 12200 kN C0 and 755 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 420 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 6850 kN rating no longer applies.",
      "Do not confuse EA and EM at the same number: 24184B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 420×700 mm envelope is identical.",
      "The 6850/12200 kN ratings, 755 kN Pu and 440000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24184B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24184B?",
        "a": "24184B is an NTN double-row spherical roller bearing to ISO 15: 420 mm bore, 700 mm OD and 280 mm width (16.535 × 27.559 × 11.024 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 6850 kN, C0 12200 kN, Pu 755 kN, grease limiting speed 410 r/min, oil 530 r/min, mass about 440000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24184B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24184BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24184B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24184B?",
        "a": "24184B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24184B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 6850 kN C / 12200 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24184BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24184BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24184b",
      "24184B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24184BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24184BK30",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 420,
    "D_mm": 700,
    "B_mm": 280,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 6850,
    "static_load_kN": 12200,
    "fatigue_load_limit_kN": 755,
    "limiting_speed_rpm": 410,
    "max_rpm": 410,
    "speed_oil_rpm": 530,
    "weight_g": 433000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 24184BK30 denotes the 420 mm bore spherical roller bearing (6850 kN C / 12200 kN C0) in the 24100 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 420 mm (two-digit code ×5, with the 00–03 exception table), and 700 mm OD / 280 mm width follow the general plan. Open by design, 24184BK30 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. 420 mm bore is 16.535 in and 700 mm OD is 27.559 in; the ISO 15 envelope swaps between brands, but the 6850/12200 kN ratings and cage design are NTN 2203E values. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 420 mm bore 24184BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 24184BK30 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 24184B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 410 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 6850 kN rating no longer applies.",
      "The 6850/12200 kN ratings, 755 kN Pu and 433000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24184BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24184BK30?",
        "a": "24184BK30 is an NTN double-row spherical roller bearing to ISO 15: 420 mm bore, 700 mm OD and 280 mm width (16.535 × 27.559 × 11.024 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 6850 kN, C0 12200 kN, Pu 755 kN, grease limiting speed 410 r/min, oil 530 r/min, mass about 433000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24184BK30 mounts on a matching adapter or withdrawal sleeve on a plain 420 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24184B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24184BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24184BK30?",
        "a": "24184BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24184BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 6850 kN C / 12200 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24184B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24184B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24184bk30",
      "24184BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23284B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23284B",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 420,
    "D_mm": 760,
    "B_mm": 272,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 7300,
    "static_load_kN": 12000,
    "fatigue_load_limit_kN": 820,
    "limiting_speed_rpm": 380,
    "max_rpm": 380,
    "speed_oil_rpm": 490,
    "weight_g": 544000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23284B is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 420×760×272 mm to ISO 15, with pressed-steel cage (standard execution). On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (cylindrical), lubrication feature (none); 23284B is assembled exactly in that order. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Speed planning: 380 r/min grease limiting speed is the cage/kinematic ceiling and 490 r/min is the oil-lubricated value for the 420 mm bore; vibrating screens rarely approach either and are load/cage limited instead. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 420 mm set.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 420 mm bore 23284B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 23284B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 420×760 mm envelope is identical.",
      "Oil relubrication toward 490 r/min needs drain and level design; flooding the 272 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Never substitute 23284B by envelope alone: the 12000 kN C0 and 820 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23284B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 7300/12000 kN ratings, 820 kN Pu and 544000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23284B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23284B?",
        "a": "23284B is an NTN double-row spherical roller bearing to ISO 15: 420 mm bore, 760 mm OD and 272 mm width (16.535 × 29.921 × 10.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 7300 kN, C0 12000 kN, Pu 820 kN, grease limiting speed 380 r/min, oil 490 r/min, mass about 544000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23284B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23284BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23284B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23284B?",
        "a": "23284B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23284B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 7300 kN C / 12000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23284BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23284BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23284b",
      "23284B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23284BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23284BK",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 420,
    "D_mm": 760,
    "B_mm": 272,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 7300,
    "static_load_kN": 12000,
    "fatigue_load_limit_kN": 820,
    "limiting_speed_rpm": 380,
    "max_rpm": 380,
    "speed_oil_rpm": 490,
    "weight_g": 528000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23284BK denotes the 420 mm bore spherical roller bearing (7300 kN C / 12000 kN C0) in the 23200 series, the self-aligning choice for heavy combined load. Reading the full code: the number gives the 420×760 mm envelope, — names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. NTN prints two speeds for 23284BK: 380 r/min grease and 490 r/min oil — the gap of 110 r/min reflects oil cooling of the heavy roller set. Grease/oil ratio: the 380 r/min limiting value is .78 of the 490 r/min oil value; heavy 272 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 420 mm set.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 420 mm bore 23284BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23284B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 420 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23284B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Oil relubrication toward 490 r/min needs drain and level design; flooding the 272 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 7300/12000 kN ratings, 820 kN Pu and 528000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23284BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23284BK?",
        "a": "23284BK is an NTN double-row spherical roller bearing to ISO 15: 420 mm bore, 760 mm OD and 272 mm width (16.535 × 29.921 × 10.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 7300 kN, C0 12000 kN, Pu 820 kN, grease limiting speed 380 r/min, oil 490 r/min, mass about 528000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23284BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23284B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23284BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23284BK?",
        "a": "23284BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23284BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 7300 kN C / 12000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23284B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23284B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23284bk",
      "23284BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23988-NTN",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23988",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 440,
    "D_mm": 600,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2260,
    "static_load_kN": 4700,
    "fatigue_load_limit_kN": 325,
    "limiting_speed_rpm": 500,
    "max_rpm": 500,
    "speed_oil_rpm": 650,
    "weight_g": 101000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23988 identifies a 440×600×118 mm (17.323 × 23.622 × 4.646 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 440 mm (two-digit code ×5, with the 00–03 exception table), and 600 mm OD / 118 mm width follow the general plan. Pu 325 kN is the catalogue fatigue load limit for 23988, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Equivalent-load planning keeps a radial plus moderate axial combination on 23988; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Fillet radii on shaft and housing must clear the ring chamfers of the 118 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 440 mm bore 23988 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 23988 carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 440×600 mm envelope is identical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 118 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Do not confuse EA and EM at the same number: 23988 carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 440×600 mm envelope is identical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 23988 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 2260/4700 kN ratings, 325 kN Pu and 101000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23988 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23988?",
        "a": "23988 is an NTN double-row spherical roller bearing to ISO 15: 440 mm bore, 600 mm OD and 118 mm width (17.323 × 23.622 × 4.646 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2260 kN, C0 4700 kN, Pu 325 kN, grease limiting speed 500 r/min, oil 650 r/min, mass about 101000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23988 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23988K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23988 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23988?",
        "a": "23988 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23988 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2260 kN C / 4700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23988",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "23988-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "23988K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23988K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23988",
      "23988-NTN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23988K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23988K",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 440,
    "D_mm": 600,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2260,
    "static_load_kN": 4700,
    "fatigue_load_limit_kN": 325,
    "limiting_speed_rpm": 500,
    "max_rpm": 500,
    "speed_oil_rpm": 650,
    "weight_g": 98000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23988K is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 440×600×118 mm to ISO 15, with pressed-steel cage (standard execution). Reading the full code: the number gives the 440×600 mm envelope, — names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. Two symmetric roller rows share the load: C 2260 kN, C0 4700 kN (C0/C ≈ 2.08), with useful axial capacity in either direction alongside the dominant radial load. With about 5.1 kN of C per millimetre of the 440 mm bore, 23988K screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 440 mm set.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 440 mm bore 23988K is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 23988K in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 500 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 2260 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 440 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The 2260/4700 kN ratings, 325 kN Pu and 98000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23988K (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23988K?",
        "a": "23988K is an NTN double-row spherical roller bearing to ISO 15: 440 mm bore, 600 mm OD and 118 mm width (17.323 × 23.622 × 4.646 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2260 kN, C0 4700 kN, Pu 325 kN, grease limiting speed 500 r/min, oil 650 r/min, mass about 98000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23988K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23988."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23988K is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23988K?",
        "a": "23988K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23988K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2260 kN C / 4700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23988-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23988-NTN — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23988k",
      "23988K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23088B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23088B",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 440,
    "D_mm": 650,
    "B_mm": 157,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 3650,
    "static_load_kN": 6850,
    "fatigue_load_limit_kN": 530,
    "limiting_speed_rpm": 470,
    "max_rpm": 470,
    "speed_oil_rpm": 610,
    "weight_g": 181000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23088B with a cylindrical bore and plain outer ring (no D1/W33 groove): 440 mm bore, 650 mm OD, 157 mm width, rated 470 r/min on grease. Numbering ties 23088B to its envelope and execution: same-number EA versus EM or plain variants share the 440 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Pu 530 kN is the catalogue fatigue load limit for 23088B, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Speed planning: 470 r/min grease limiting speed is the cage/kinematic ceiling and 610 r/min is the oil-lubricated value for the 440 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 440 mm bore 23088B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 440 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Never substitute 23088B by envelope alone: the 6850 kN C0 and 530 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Never substitute 23088B by envelope alone: the 6850 kN C0 and 530 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 23088B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 3650/6850 kN ratings, 530 kN Pu and 181000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23088B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23088B?",
        "a": "23088B is an NTN double-row spherical roller bearing to ISO 15: 440 mm bore, 650 mm OD and 157 mm width (17.323 × 25.591 × 6.181 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3650 kN, C0 6850 kN, Pu 530 kN, grease limiting speed 470 r/min, oil 610 r/min, mass about 181000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23088B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23088BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23088B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23088B?",
        "a": "23088B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23088B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3650 kN C / 6850 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23088BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23088BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23088b",
      "23088B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23088BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23088BK",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 440,
    "D_mm": 650,
    "B_mm": 157,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 3650,
    "static_load_kN": 6850,
    "fatigue_load_limit_kN": 530,
    "limiting_speed_rpm": 470,
    "max_rpm": 470,
    "speed_oil_rpm": 610,
    "weight_g": 175000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23088BK with a 1:12 tapered bore (K) and plain outer ring (no D1/W33 groove): 440 mm bore, 650 mm OD, 157 mm width, rated 470 r/min on grease. Reading the full code: the number gives the 440×650 mm envelope, — names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Pu 530 kN against C0 6850 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23088BK moves with cleanliness far more than with small C variations. Never mount 23088BK by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 650 mm race.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 440 mm bore 23088BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 23088BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Do not confuse EA and EM at the same number: 23088BK carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 440×650 mm envelope is identical.",
      "Do not confuse EA and EM at the same number: 23088BK carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 440×650 mm envelope is identical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23088BK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 3650/6850 kN ratings, 530 kN Pu and 175000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23088BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23088BK?",
        "a": "23088BK is an NTN double-row spherical roller bearing to ISO 15: 440 mm bore, 650 mm OD and 157 mm width (17.323 × 25.591 × 6.181 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3650 kN, C0 6850 kN, Pu 530 kN, grease limiting speed 470 r/min, oil 610 r/min, mass about 175000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23088BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23088B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23088BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23088BK?",
        "a": "23088BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23088BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3650 kN C / 6850 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23088B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23088B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23088bk",
      "23088BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24088B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24088B",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 440,
    "D_mm": 650,
    "B_mm": 212,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4800,
    "static_load_kN": 9450,
    "fatigue_load_limit_kN": 530,
    "limiting_speed_rpm": 420,
    "max_rpm": 420,
    "speed_oil_rpm": 540,
    "weight_g": 245000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24088B is the basic execution of NTN's spherical roller range for a 440 mm shaft — 4800 kN basic dynamic capacity in a 245000 g, open ISO 15 envelope. The leading digits are the ISO 15 dimension series (24000 series); the bore code resolves to 440 mm (two-digit code ×5, with the 00–03 exception table), and 650 mm OD / 212 mm width follow the general plan. NTN prints two speeds for 24088B: 420 r/min grease and 540 r/min oil — the gap of 120 r/min reflects oil cooling of the heavy roller set. Selection: the C0/C ratio of 1.97 (9450/4800 kN) reflects the heavy static and shock proportioning of 24088B; size the equivalent load at the required L10 with shock factor for the application. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 440 mm bore 24088B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 24088B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24088B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 440 mm bearing, and drive-up procedures differ.",
      "Oil relubrication toward 540 r/min needs drain and level design; flooding the 212 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 4800/9450 kN ratings, 530 kN Pu and 245000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24088B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24088B?",
        "a": "24088B is an NTN double-row spherical roller bearing to ISO 15: 440 mm bore, 650 mm OD and 212 mm width (17.323 × 25.591 × 8.346 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4800 kN, C0 9450 kN, Pu 530 kN, grease limiting speed 420 r/min, oil 540 r/min, mass about 245000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24088B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24088BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24088B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24088B?",
        "a": "24088B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24088B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4800 kN C / 9450 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24088BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24088BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24088b",
      "24088B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24088BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24088BK30",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 440,
    "D_mm": 650,
    "B_mm": 212,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4800,
    "static_load_kN": 9450,
    "fatigue_load_limit_kN": 530,
    "limiting_speed_rpm": 420,
    "max_rpm": 420,
    "speed_oil_rpm": 540,
    "weight_g": 241000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 24088BK30 with a 1:30 tapered bore (K30) and plain outer ring (no D1/W33 groove): 440 mm bore, 650 mm OD, 212 mm width, rated 420 r/min on grease. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (K30), lubrication feature (none); 24088BK30 is assembled exactly in that order. Two symmetric roller rows share the load: C 4800 kN, C0 9450 kN (C0/C ≈ 1.97), with useful axial capacity in either direction alongside the dominant radial load. Speed planning: 420 r/min grease limiting speed is the cage/kinematic ceiling and 540 r/min is the oil-lubricated value for the 440 mm bore; vibrating screens rarely approach either and are load/cage limited instead. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 24088BK30 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 440 mm bore 24088BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 24088B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 420 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 4800 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 440 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The 4800/9450 kN ratings, 530 kN Pu and 241000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24088BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24088BK30?",
        "a": "24088BK30 is an NTN double-row spherical roller bearing to ISO 15: 440 mm bore, 650 mm OD and 212 mm width (17.323 × 25.591 × 8.346 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4800 kN, C0 9450 kN, Pu 530 kN, grease limiting speed 420 r/min, oil 540 r/min, mass about 241000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 24088BK30 mounts on a matching adapter or withdrawal sleeve on a plain 440 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24088B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24088BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24088BK30?",
        "a": "24088BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24088BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4800 kN C / 9450 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24088B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24088B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24088bk30",
      "24088BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23188B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23188B",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 440,
    "D_mm": 720,
    "B_mm": 226,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5800,
    "static_load_kN": 10100,
    "fatigue_load_limit_kN": 685,
    "limiting_speed_rpm": 390,
    "max_rpm": 390,
    "speed_oil_rpm": 500,
    "weight_g": 370000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23188B is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 440×720×226 mm to ISO 15, with pressed-steel cage (standard execution). On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (cylindrical), lubrication feature (none); 23188B is assembled exactly in that order. At 5800 kN C and 370000 g mass the 23100 series part is built for shock and vibration; the 226 mm-wide ring needs square abutments to keep both rows equally loaded. Catalogue mass 370000 g (370.00 kg) for the 440×720×226 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Never mount 23188B by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 720 mm race.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 440 mm bore 23188B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 500 r/min needs drain and level design; flooding the 226 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 440 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 23188B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 390 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 5800/10100 kN ratings, 685 kN Pu and 370000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23188B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23188B?",
        "a": "23188B is an NTN double-row spherical roller bearing to ISO 15: 440 mm bore, 720 mm OD and 226 mm width (17.323 × 28.346 × 8.898 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5800 kN, C0 10100 kN, Pu 685 kN, grease limiting speed 390 r/min, oil 500 r/min, mass about 370000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23188B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23188BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23188B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23188B?",
        "a": "23188B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23188B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5800 kN C / 10100 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23188BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23188BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23188b",
      "23188B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23188BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23188BK",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 440,
    "D_mm": 720,
    "B_mm": 226,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5800,
    "static_load_kN": 10100,
    "fatigue_load_limit_kN": 685,
    "limiting_speed_rpm": 390,
    "max_rpm": 390,
    "speed_oil_rpm": 500,
    "weight_g": 358000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23188BK is the basic execution of NTN's spherical roller range for a 440 mm shaft — 5800 kN basic dynamic capacity in a 358000 g, open ISO 15 envelope. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (K), lubrication feature (none); 23188BK is assembled exactly in that order. Open by design, 23188BK requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Speed planning: 390 r/min grease limiting speed is the cage/kinematic ceiling and 500 r/min is the oil-lubricated value for the 440 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Never mount 23188BK by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 720 mm race.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 440 mm bore 23188BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23188BK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 5800 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 440 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 5800 kN rating no longer applies.",
      "The 5800/10100 kN ratings, 685 kN Pu and 358000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23188BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23188BK?",
        "a": "23188BK is an NTN double-row spherical roller bearing to ISO 15: 440 mm bore, 720 mm OD and 226 mm width (17.323 × 28.346 × 8.898 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5800 kN, C0 10100 kN, Pu 685 kN, grease limiting speed 390 r/min, oil 500 r/min, mass about 358000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23188BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23188B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23188BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23188BK?",
        "a": "23188BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23188BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5800 kN C / 10100 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23188B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23188B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23188bk",
      "23188BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24188B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24188B",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 440,
    "D_mm": 720,
    "B_mm": 280,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 7200,
    "static_load_kN": 13100,
    "fatigue_load_limit_kN": 715,
    "limiting_speed_rpm": 390,
    "max_rpm": 390,
    "speed_oil_rpm": 500,
    "weight_g": 456000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 24188B denotes the 440 mm bore spherical roller bearing (7200 kN C / 13100 kN C0) in the 24100 series, the self-aligning choice for heavy combined load. Numbering ties 24188B to its envelope and execution: same-number EA versus EM or plain variants share the 440 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Pu 715 kN against C0 13100 kN anchors the contamination derating; for dirty mining duty the adjusted life of 24188B moves with cleanliness far more than with small C variations. Never mount 24188B by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 720 mm race.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 440 mm bore 24188B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 7200 kN rating no longer applies.",
      "Do not confuse EA and EM at the same number: 24188B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 440×720 mm envelope is identical.",
      "The cylindrical-bore 24188B and its tapered-bore counterpart 24188BK30 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 440 mm bearing, and drive-up procedures differ.",
      "The 7200/13100 kN ratings, 715 kN Pu and 456000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24188B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24188B?",
        "a": "24188B is an NTN double-row spherical roller bearing to ISO 15: 440 mm bore, 720 mm OD and 280 mm width (17.323 × 28.346 × 11.024 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 7200 kN, C0 13100 kN, Pu 715 kN, grease limiting speed 390 r/min, oil 500 r/min, mass about 456000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24188B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24188BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24188B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24188B?",
        "a": "24188B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24188B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 7200 kN C / 13100 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24188BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24188BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24188b",
      "24188B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24188BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24188BK30",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 440,
    "D_mm": 720,
    "B_mm": 280,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 7200,
    "static_load_kN": 13100,
    "fatigue_load_limit_kN": 715,
    "limiting_speed_rpm": 390,
    "max_rpm": 390,
    "speed_oil_rpm": 500,
    "weight_g": 449000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 24188BK30 denotes the 440 mm bore spherical roller bearing (7200 kN C / 13100 kN C0) in the 24100 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 440 mm (two-digit code ×5, with the 00–03 exception table), and 720 mm OD / 280 mm width follow the general plan. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Catalogue mass 449000 g (449.00 kg) for the 440×720×280 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Never mount 24188BK30 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 720 mm race.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 440 mm bore 24188BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 390 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 7200 kN rating no longer applies.",
      "Never substitute 24188BK30 by envelope alone: the 13100 kN C0 and 715 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 440 mm bearing, and drive-up procedures differ.",
      "The 7200/13100 kN ratings, 715 kN Pu and 449000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24188BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24188BK30?",
        "a": "24188BK30 is an NTN double-row spherical roller bearing to ISO 15: 440 mm bore, 720 mm OD and 280 mm width (17.323 × 28.346 × 11.024 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 7200 kN, C0 13100 kN, Pu 715 kN, grease limiting speed 390 r/min, oil 500 r/min, mass about 449000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24188BK30 mounts on a matching adapter or withdrawal sleeve on a plain 440 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24188B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24188BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24188BK30?",
        "a": "24188BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24188BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 7200 kN C / 13100 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24188B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24188B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24188bk30",
      "24188BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23288B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23288B",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 440,
    "D_mm": 790,
    "B_mm": 280,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 7700,
    "static_load_kN": 12800,
    "fatigue_load_limit_kN": 870,
    "limiting_speed_rpm": 360,
    "max_rpm": 360,
    "speed_oil_rpm": 470,
    "weight_g": 600000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23288B identifies a 440×790×280 mm (17.323 × 31.102 × 11.024 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Reading the full code: the number gives the 440×790 mm envelope, — names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and plain outer ring (no D1/W33 groove) completes the order number. Two symmetric roller rows share the load: C 7700 kN, C0 12800 kN (C0/C ≈ 1.66), with useful axial capacity in either direction alongside the dominant radial load. 440 mm bore is 17.323 in and 790 mm OD is 31.102 in; the ISO 15 envelope swaps between brands, but the 7700/12800 kN ratings and cage design are NTN 2203E values. Fit the cylindrical-bore 23288B with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 440 mm bore 23288B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The cylindrical-bore 23288B and its tapered-bore counterpart 23288BK share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 440 mm bearing, and drive-up procedures differ.",
      "Do not confuse EA and EM at the same number: 23288B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 440×790 mm envelope is identical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 440 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The 7700/12800 kN ratings, 870 kN Pu and 600000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23288B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23288B?",
        "a": "23288B is an NTN double-row spherical roller bearing to ISO 15: 440 mm bore, 790 mm OD and 280 mm width (17.323 × 31.102 × 11.024 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 7700 kN, C0 12800 kN, Pu 870 kN, grease limiting speed 360 r/min, oil 470 r/min, mass about 600000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23288B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23288BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23288B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23288B?",
        "a": "23288B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23288B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 7700 kN C / 12800 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23288BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23288BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23288b",
      "23288B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23288BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23288BK",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 440,
    "D_mm": 790,
    "B_mm": 280,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 7700,
    "static_load_kN": 12800,
    "fatigue_load_limit_kN": 870,
    "limiting_speed_rpm": 360,
    "max_rpm": 360,
    "speed_oil_rpm": 470,
    "weight_g": 582000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23288BK with a 1:12 tapered bore (K) and plain outer ring (no D1/W33 groove): 440 mm bore, 790 mm OD, 280 mm width, rated 360 r/min on grease. Numbering ties 23288BK to its envelope and execution: same-number EA versus EM or plain variants share the 440 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Suffix reading on 23288BK: the bare number is the standard open execution; K marks the 1:12 tapered bore; B marks the standard large-bore internal design on slash-size 230–232 series; quote the full code because each suffix is a distinct article. Selection: the C0/C ratio of 1.66 (12800/7700 kN) reflects the heavy static and shock proportioning of 23288BK; size the equivalent load at the required L10 with shock factor for the application. Fillet radii on shaft and housing must clear the ring chamfers of the 280 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 440 mm bore 23288BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 440 mm bearing, and drive-up procedures differ.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 23288BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 360 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 280 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 7700/12800 kN ratings, 870 kN Pu and 582000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23288BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23288BK?",
        "a": "23288BK is an NTN double-row spherical roller bearing to ISO 15: 440 mm bore, 790 mm OD and 280 mm width (17.323 × 31.102 × 11.024 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 7700 kN, C0 12800 kN, Pu 870 kN, grease limiting speed 360 r/min, oil 470 r/min, mass about 582000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23288BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23288B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23288BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23288BK?",
        "a": "23288BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23288BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 7700 kN C / 12800 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23288B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23288B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23288bk",
      "23288BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23992-NTN",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23992",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 460,
    "D_mm": 620,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2340,
    "static_load_kN": 4950,
    "fatigue_load_limit_kN": 325,
    "limiting_speed_rpm": 480,
    "max_rpm": 480,
    "speed_oil_rpm": 620,
    "weight_g": 107000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23992 is the basic execution of NTN's spherical roller range for a 460 mm shaft — 2340 kN basic dynamic capacity in a 107000 g, open ISO 15 envelope. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 460 mm (two-digit code ×5, with the 00–03 exception table), and 620 mm OD / 118 mm width follow the general plan. The 80.0 mm radial section over the 460 mm bore carries two roller rows; capacity per millimetre of bore is about 5.1 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Selection: the C0/C ratio of 2.12 (4950/2340 kN) reflects the heavy static and shock proportioning of 23992; size the equivalent load at the required L10 with shock factor for the application. Never mount 23992 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 620 mm race.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 460 mm bore 23992 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The cylindrical-bore 23992 and its tapered-bore counterpart 23992K share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 460 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 460 mm bearing, and drive-up procedures differ.",
      "The cylindrical-bore 23992 and its tapered-bore counterpart 23992K share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 2340/4950 kN ratings, 325 kN Pu and 107000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23992 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23992?",
        "a": "23992 is an NTN double-row spherical roller bearing to ISO 15: 460 mm bore, 620 mm OD and 118 mm width (18.11 × 24.409 × 4.646 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2340 kN, C0 4950 kN, Pu 325 kN, grease limiting speed 480 r/min, oil 620 r/min, mass about 107000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23992 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23992K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23992 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23992?",
        "a": "23992 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23992 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2340 kN C / 4950 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23992",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "23992-CAK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "23992K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23992K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23992",
      "23992-NTN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23992K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23992K",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 460,
    "D_mm": 620,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2340,
    "static_load_kN": 4950,
    "fatigue_load_limit_kN": 325,
    "limiting_speed_rpm": 480,
    "max_rpm": 480,
    "speed_oil_rpm": 620,
    "weight_g": 104000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23992K identifies a 460×620×118 mm (18.11 × 24.409 × 4.646 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Reading the full code: the number gives the 460×620 mm envelope, — names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. The 1:12 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 460 mm bore assembly. Selection: the C0/C ratio of 2.12 (4950/2340 kN) reflects the heavy static and shock proportioning of 23992K; size the equivalent load at the required L10 with shock factor for the application. Never mount 23992K by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 620 mm race.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 460 mm bore 23992K is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 2340 kN rating no longer applies.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23992: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23992: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Do not confuse EA and EM at the same number: 23992K carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 460×620 mm envelope is identical.",
      "The 2340/4950 kN ratings, 325 kN Pu and 104000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23992K (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23992K?",
        "a": "23992K is an NTN double-row spherical roller bearing to ISO 15: 460 mm bore, 620 mm OD and 118 mm width (18.11 × 24.409 × 4.646 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2340 kN, C0 4950 kN, Pu 325 kN, grease limiting speed 480 r/min, oil 620 r/min, mass about 104000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23992K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23992."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23992K is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23992K?",
        "a": "23992K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23992K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2340 kN C / 4950 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23992-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23992-NTN — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23992k",
      "23992K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23092B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23092B",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 460,
    "D_mm": 680,
    "B_mm": 163,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4000,
    "static_load_kN": 7450,
    "fatigue_load_limit_kN": 560,
    "limiting_speed_rpm": 450,
    "max_rpm": 450,
    "speed_oil_rpm": 580,
    "weight_g": 206000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23092B is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 460×680×163 mm to ISO 15, with pressed-steel cage (standard execution). The leading digits are the ISO 15 dimension series (23000 series); the bore code resolves to 460 mm (two-digit code ×5, with the 00–03 exception table), and 680 mm OD / 163 mm width follow the general plan. The cylindrical bore fits a machined 460 mm shaft seat directly; the same envelope in 23092BK (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Equivalent-load planning keeps a radial plus moderate axial combination on 23092B; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 460 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 460 mm bore 23092B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 4000 kN rating no longer applies.",
      "Oil relubrication toward 580 r/min needs drain and level design; flooding the 163 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 460 mm bearing, and drive-up procedures differ.",
      "Do not confuse EA and EM at the same number: 23092B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 460×680 mm envelope is identical.",
      "The 4000/7450 kN ratings, 560 kN Pu and 206000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23092B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23092B?",
        "a": "23092B is an NTN double-row spherical roller bearing to ISO 15: 460 mm bore, 680 mm OD and 163 mm width (18.11 × 26.772 × 6.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4000 kN, C0 7450 kN, Pu 560 kN, grease limiting speed 450 r/min, oil 580 r/min, mass about 206000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23092B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23092BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23092B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23092B?",
        "a": "23092B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23092B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4000 kN C / 7450 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23092BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23092BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23092b",
      "23092B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23092BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23092BK",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 460,
    "D_mm": 680,
    "B_mm": 163,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4000,
    "static_load_kN": 7450,
    "fatigue_load_limit_kN": 560,
    "limiting_speed_rpm": 450,
    "max_rpm": 450,
    "speed_oil_rpm": 580,
    "weight_g": 200000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23092BK with a 1:12 tapered bore (K) and plain outer ring (no D1/W33 groove): 460 mm bore, 680 mm OD, 163 mm width, rated 450 r/min on grease. Digit by digit the code reads as spherical-roller dimension series plus 460 mm bore; the 163 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Open by design, 23092BK requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Grease/oil ratio: the 450 r/min limiting value is .78 of the 580 r/min oil value; heavy 163 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Fillet radii on shaft and housing must clear the ring chamfers of the 163 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 460 mm bore 23092BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 460 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 23092BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23092B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 4000 kN rating no longer applies.",
      "The 4000/7450 kN ratings, 560 kN Pu and 200000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23092BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23092BK?",
        "a": "23092BK is an NTN double-row spherical roller bearing to ISO 15: 460 mm bore, 680 mm OD and 163 mm width (18.11 × 26.772 × 6.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4000 kN, C0 7450 kN, Pu 560 kN, grease limiting speed 450 r/min, oil 580 r/min, mass about 200000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23092BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23092B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23092BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23092BK?",
        "a": "23092BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23092BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4000 kN C / 7450 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23092B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23092B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23092bk",
      "23092BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24092B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24092B",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 460,
    "D_mm": 680,
    "B_mm": 218,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5100,
    "static_load_kN": 10200,
    "fatigue_load_limit_kN": 590,
    "limiting_speed_rpm": 390,
    "max_rpm": 390,
    "speed_oil_rpm": 510,
    "weight_g": 276000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 24092B denotes the 460 mm bore spherical roller bearing (5100 kN C / 10200 kN C0) in the 24000 series, the self-aligning choice for heavy combined load. Digit by digit the code reads as spherical-roller dimension series plus 460 mm bore; the 218 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Grease/oil ratio: the 390 r/min limiting value is .76 of the 510 r/min oil value; heavy 218 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 460 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 460 mm bore 24092B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 460 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 460 mm bearing, and drive-up procedures differ.",
      "Oil relubrication toward 510 r/min needs drain and level design; flooding the 218 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24092B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 5100/10200 kN ratings, 590 kN Pu and 276000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24092B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24092B?",
        "a": "24092B is an NTN double-row spherical roller bearing to ISO 15: 460 mm bore, 680 mm OD and 218 mm width (18.11 × 26.772 × 8.583 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5100 kN, C0 10200 kN, Pu 590 kN, grease limiting speed 390 r/min, oil 510 r/min, mass about 276000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24092B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24092BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24092B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24092B?",
        "a": "24092B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24092B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5100 kN C / 10200 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24092BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24092BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24092b",
      "24092B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24092BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24092BK30",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 460,
    "D_mm": 680,
    "B_mm": 218,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5100,
    "static_load_kN": 10200,
    "fatigue_load_limit_kN": 590,
    "limiting_speed_rpm": 390,
    "max_rpm": 390,
    "speed_oil_rpm": 510,
    "weight_g": 272000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24092BK30 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 460×680×218 mm to ISO 15, with pressed-steel cage (standard execution). On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (K30), lubrication feature (none); 24092BK30 is assembled exactly in that order. The 110.0 mm radial section over the 460 mm bore carries two roller rows; capacity per millimetre of bore is about 11.1 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. With about 11.1 kN of C per millimetre of the 460 mm bore, 24092BK30 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 460 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 460 mm bore 24092BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 510 r/min needs drain and level design; flooding the 218 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24092BK30 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 5100 kN rating no longer applies.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 24092B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 5100/10200 kN ratings, 590 kN Pu and 272000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24092BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24092BK30?",
        "a": "24092BK30 is an NTN double-row spherical roller bearing to ISO 15: 460 mm bore, 680 mm OD and 218 mm width (18.11 × 26.772 × 8.583 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5100 kN, C0 10200 kN, Pu 590 kN, grease limiting speed 390 r/min, oil 510 r/min, mass about 272000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 24092BK30 mounts on a matching adapter or withdrawal sleeve on a plain 460 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24092B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24092BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24092BK30?",
        "a": "24092BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24092BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5100 kN C / 10200 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24092B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24092B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24092bk30",
      "24092BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23192B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23192B",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 460,
    "D_mm": 760,
    "B_mm": 240,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 6350,
    "static_load_kN": 11400,
    "fatigue_load_limit_kN": 775,
    "limiting_speed_rpm": 360,
    "max_rpm": 360,
    "speed_oil_rpm": 470,
    "weight_g": 443000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23192B identifies a 460×760×240 mm (18.11 × 29.921 × 9.449 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Numbering ties 23192B to its envelope and execution: same-number EA versus EM or plain variants share the 460 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Two symmetric roller rows share the load: C 6350 kN, C0 11400 kN (C0/C ≈ 1.80), with useful axial capacity in either direction alongside the dominant radial load. Speed planning: 360 r/min grease limiting speed is the cage/kinematic ceiling and 470 r/min is the oil-lubricated value for the 460 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 460 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 460 mm bore 23192B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 23192B by envelope alone: the 11400 kN C0 and 775 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 23192B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Oil relubrication toward 470 r/min needs drain and level design; flooding the 240 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 460 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The 6350/11400 kN ratings, 775 kN Pu and 443000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23192B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23192B?",
        "a": "23192B is an NTN double-row spherical roller bearing to ISO 15: 460 mm bore, 760 mm OD and 240 mm width (18.11 × 29.921 × 9.449 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 6350 kN, C0 11400 kN, Pu 775 kN, grease limiting speed 360 r/min, oil 470 r/min, mass about 443000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23192B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23192BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23192B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23192B?",
        "a": "23192B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23192B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 6350 kN C / 11400 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23192BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23192BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23192b",
      "23192B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23192BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23192BK",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 460,
    "D_mm": 760,
    "B_mm": 240,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 6350,
    "static_load_kN": 11400,
    "fatigue_load_limit_kN": 775,
    "limiting_speed_rpm": 360,
    "max_rpm": 360,
    "speed_oil_rpm": 470,
    "weight_g": 429000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23192BK denotes the 460 mm bore spherical roller bearing (6350 kN C / 11400 kN C0) in the 23100 series, the self-aligning choice for heavy combined load. Reading the full code: the number gives the 460×760 mm envelope, — names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. Suffix reading on 23192BK: the bare number is the standard open execution; K marks the 1:12 tapered bore; B marks the standard large-bore internal design on slash-size 230–232 series; quote the full code because each suffix is a distinct article. 460 mm bore is 18.11 in and 760 mm OD is 29.921 in; the ISO 15 envelope swaps between brands, but the 6350/11400 kN ratings and cage design are NTN 2203E values. Mount 23192BK on its adapter or withdrawal sleeve on the 460 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 460 mm bore 23192BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 23192BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 460 mm bearing, and drive-up procedures differ.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23192BK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 240 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 6350/11400 kN ratings, 775 kN Pu and 429000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23192BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23192BK?",
        "a": "23192BK is an NTN double-row spherical roller bearing to ISO 15: 460 mm bore, 760 mm OD and 240 mm width (18.11 × 29.921 × 9.449 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 6350 kN, C0 11400 kN, Pu 775 kN, grease limiting speed 360 r/min, oil 470 r/min, mass about 429000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23192BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23192B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23192BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23192BK?",
        "a": "23192BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23192BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 6350 kN C / 11400 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23192B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23192B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23192bk",
      "23192BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24192B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24192B",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 460,
    "D_mm": 760,
    "B_mm": 300,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 7900,
    "static_load_kN": 14500,
    "fatigue_load_limit_kN": 805,
    "limiting_speed_rpm": 360,
    "max_rpm": 360,
    "speed_oil_rpm": 470,
    "weight_g": 550000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24192B belongs to the 24100 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 460 mm (two-digit code ×5, with the 00–03 exception table), and 760 mm OD / 300 mm width follow the general plan. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the basic cage. Selection: the C0/C ratio of 1.84 (14500/7900 kN) reflects the heavy static and shock proportioning of 24192B; size the equivalent load at the required L10 with shock factor for the application. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 460 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 460 mm bore 24192B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 470 r/min needs drain and level design; flooding the 300 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 360 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 300 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 24192B by envelope alone: the 14500 kN C0 and 805 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The 7900/14500 kN ratings, 805 kN Pu and 550000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24192B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24192B?",
        "a": "24192B is an NTN double-row spherical roller bearing to ISO 15: 460 mm bore, 760 mm OD and 300 mm width (18.11 × 29.921 × 11.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 7900 kN, C0 14500 kN, Pu 805 kN, grease limiting speed 360 r/min, oil 470 r/min, mass about 550000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24192B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24192BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24192B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24192B?",
        "a": "24192B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24192B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 7900 kN C / 14500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24192BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24192BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24192b",
      "24192B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24192BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24192BK30",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 460,
    "D_mm": 760,
    "B_mm": 300,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 7900,
    "static_load_kN": 14500,
    "fatigue_load_limit_kN": 805,
    "limiting_speed_rpm": 360,
    "max_rpm": 360,
    "speed_oil_rpm": 470,
    "weight_g": 541000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24192BK30 belongs to the 24100 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 460 mm (two-digit code ×5, with the 00–03 exception table), and 760 mm OD / 300 mm width follow the general plan. NTN prints two speeds for 24192BK30: 360 r/min grease and 470 r/min oil — the gap of 110 r/min reflects oil cooling of the heavy roller set. 460 mm bore is 18.11 in and 760 mm OD is 29.921 in; the ISO 15 envelope swaps between brands, but the 7900/14500 kN ratings and cage design are NTN 2203E values. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 24192BK30 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 460 mm bore 24192BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 24192BK30 by envelope alone: the 14500 kN C0 and 805 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 360 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 360 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Oil relubrication toward 470 r/min needs drain and level design; flooding the 300 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 7900/14500 kN ratings, 805 kN Pu and 541000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24192BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24192BK30?",
        "a": "24192BK30 is an NTN double-row spherical roller bearing to ISO 15: 460 mm bore, 760 mm OD and 300 mm width (18.11 × 29.921 × 11.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 7900 kN, C0 14500 kN, Pu 805 kN, grease limiting speed 360 r/min, oil 470 r/min, mass about 541000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24192BK30 mounts on a matching adapter or withdrawal sleeve on a plain 460 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24192B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24192BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24192BK30?",
        "a": "24192BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24192BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 7900 kN C / 14500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24192B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24192B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24192bk30",
      "24192BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23292B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23292B",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 460,
    "D_mm": 830,
    "B_mm": 296,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 8650,
    "static_load_kN": 14500,
    "fatigue_load_limit_kN": 925,
    "limiting_speed_rpm": 340,
    "max_rpm": 340,
    "speed_oil_rpm": 440,
    "weight_g": 704000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23292B is the basic execution of NTN's spherical roller range for a 460 mm shaft — 8650 kN basic dynamic capacity in a 704000 g, open ISO 15 envelope. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (cylindrical), lubrication feature (none); 23292B is assembled exactly in that order. The cylindrical bore fits a machined 460 mm shaft seat directly; the same envelope in 23292BK (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Catalogue mass 704000 g (704.00 kg) for the 460×830×296 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 460 mm bore 23292B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 340 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 296 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23292B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Do not confuse EA and EM at the same number: 23292B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 460×830 mm envelope is identical.",
      "The 8650/14500 kN ratings, 925 kN Pu and 704000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23292B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23292B?",
        "a": "23292B is an NTN double-row spherical roller bearing to ISO 15: 460 mm bore, 830 mm OD and 296 mm width (18.11 × 32.677 × 11.654 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 8650 kN, C0 14500 kN, Pu 925 kN, grease limiting speed 340 r/min, oil 440 r/min, mass about 704000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23292B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23292BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23292B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23292B?",
        "a": "23292B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23292B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 8650 kN C / 14500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23292BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23292BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23292b",
      "23292B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23292BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23292BK",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 460,
    "D_mm": 830,
    "B_mm": 296,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 8650,
    "static_load_kN": 14500,
    "fatigue_load_limit_kN": 925,
    "limiting_speed_rpm": 340,
    "max_rpm": 340,
    "speed_oil_rpm": 440,
    "weight_g": 683000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23292BK with a 1:12 tapered bore (K) and plain outer ring (no D1/W33 groove): 460 mm bore, 830 mm OD, 296 mm width, rated 340 r/min on grease. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (K), lubrication feature (none); 23292BK is assembled exactly in that order. Pu 925 kN is the catalogue fatigue load limit for 23292BK, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. With about 18.8 kN of C per millimetre of the 460 mm bore, 23292BK screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Mount 23292BK on its adapter or withdrawal sleeve on the 460 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 460 mm bore 23292BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23292BK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Never substitute 23292BK by envelope alone: the 14500 kN C0 and 925 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Never substitute 23292BK by envelope alone: the 14500 kN C0 and 925 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 23292BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 8650/14500 kN ratings, 925 kN Pu and 683000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23292BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23292BK?",
        "a": "23292BK is an NTN double-row spherical roller bearing to ISO 15: 460 mm bore, 830 mm OD and 296 mm width (18.11 × 32.677 × 11.654 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 8650 kN, C0 14500 kN, Pu 925 kN, grease limiting speed 340 r/min, oil 440 r/min, mass about 683000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23292BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23292B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23292BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23292BK?",
        "a": "23292BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23292BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 8650 kN C / 14500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23292B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23292B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23292bk",
      "23292BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23996-NTN",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23996",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 480,
    "D_mm": 650,
    "B_mm": 128,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2590,
    "static_load_kN": 5500,
    "fatigue_load_limit_kN": 365,
    "limiting_speed_rpm": 450,
    "max_rpm": 450,
    "speed_oil_rpm": 590,
    "weight_g": 123000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23996 identifies a 480×650×128 mm (18.898 × 25.591 × 5.039 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 480 mm (two-digit code ×5, with the 00–03 exception table), and 650 mm OD / 128 mm width follow the general plan. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Equivalent-load planning keeps a radial plus moderate axial combination on 23996; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Fillet radii on shaft and housing must clear the ring chamfers of the 128 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 480 mm bore 23996 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 23996 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 450 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Do not confuse EA and EM at the same number: 23996 carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 480×650 mm envelope is identical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 480 mm bearing, and drive-up procedures differ.",
      "The 2590/5500 kN ratings, 365 kN Pu and 123000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23996 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23996?",
        "a": "23996 is an NTN double-row spherical roller bearing to ISO 15: 480 mm bore, 650 mm OD and 128 mm width (18.898 × 25.591 × 5.039 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2590 kN, C0 5500 kN, Pu 365 kN, grease limiting speed 450 r/min, oil 590 r/min, mass about 123000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23996 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23996K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23996 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23996?",
        "a": "23996 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23996 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2590 kN C / 5500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23996",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 480×650×128 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "23996-CAK-W33",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 480×650×128 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "23996K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23996K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23996",
      "23996-NTN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23996K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23996K",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 480,
    "D_mm": 650,
    "B_mm": 128,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2590,
    "static_load_kN": 5500,
    "fatigue_load_limit_kN": 365,
    "limiting_speed_rpm": 450,
    "max_rpm": 450,
    "speed_oil_rpm": 590,
    "weight_g": 119000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23996K is the basic execution of NTN's spherical roller range for a 480 mm shaft — 2590 kN basic dynamic capacity in a 119000 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 480 mm bore; the 128 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. With about 5.4 kN of C per millimetre of the 480 mm bore, 23996K screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 480 mm bore 23996K is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 23996K in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 23996K in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 128 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 480 mm bearing, and drive-up procedures differ.",
      "The 2590/5500 kN ratings, 365 kN Pu and 119000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23996K (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23996K?",
        "a": "23996K is an NTN double-row spherical roller bearing to ISO 15: 480 mm bore, 650 mm OD and 128 mm width (18.898 × 25.591 × 5.039 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2590 kN, C0 5500 kN, Pu 365 kN, grease limiting speed 450 r/min, oil 590 r/min, mass about 119000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23996K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23996."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23996K is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23996K?",
        "a": "23996K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23996K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2590 kN C / 5500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23996-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23996-NTN — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23996k",
      "23996K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23096B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23096B",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 480,
    "D_mm": 700,
    "B_mm": 165,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4050,
    "static_load_kN": 7700,
    "fatigue_load_limit_kN": 570,
    "limiting_speed_rpm": 420,
    "max_rpm": 420,
    "speed_oil_rpm": 550,
    "weight_g": 217000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23096B identifies a 480×700×165 mm (18.898 × 27.559 × 6.496 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Numbering ties 23096B to its envelope and execution: same-number EA versus EM or plain variants share the 480 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Pu 570 kN against C0 7700 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23096B moves with cleanliness far more than with small C variations. Fillet radii on shaft and housing must clear the ring chamfers of the 165 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 480 mm bore 23096B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 23096B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 480 mm bearing, and drive-up procedures differ.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 480 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 480 mm bearing, and drive-up procedures differ.",
      "The 4050/7700 kN ratings, 570 kN Pu and 217000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23096B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23096B?",
        "a": "23096B is an NTN double-row spherical roller bearing to ISO 15: 480 mm bore, 700 mm OD and 165 mm width (18.898 × 27.559 × 6.496 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4050 kN, C0 7700 kN, Pu 570 kN, grease limiting speed 420 r/min, oil 550 r/min, mass about 217000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23096B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23096BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23096B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23096B?",
        "a": "23096B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23096B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4050 kN C / 7700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23096BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23096BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23096b",
      "23096B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23096BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23096BK",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 480,
    "D_mm": 700,
    "B_mm": 165,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4050,
    "static_load_kN": 7700,
    "fatigue_load_limit_kN": 570,
    "limiting_speed_rpm": 420,
    "max_rpm": 420,
    "speed_oil_rpm": 550,
    "weight_g": 209000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23096BK is the basic execution of NTN's spherical roller range for a 480 mm shaft — 4050 kN basic dynamic capacity in a 209000 g, open ISO 15 envelope. Reading the full code: the number gives the 480×700 mm envelope, — names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. The 1:12 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 480 mm bore assembly. Equivalent-load planning keeps a radial plus moderate axial combination on 23096BK; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 480 mm bore 23096BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 420 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23096BK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 420 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Do not confuse EA and EM at the same number: 23096BK carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 480×700 mm envelope is identical.",
      "The 4050/7700 kN ratings, 570 kN Pu and 209000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23096BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23096BK?",
        "a": "23096BK is an NTN double-row spherical roller bearing to ISO 15: 480 mm bore, 700 mm OD and 165 mm width (18.898 × 27.559 × 6.496 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4050 kN, C0 7700 kN, Pu 570 kN, grease limiting speed 420 r/min, oil 550 r/min, mass about 209000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23096BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23096B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23096BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23096BK?",
        "a": "23096BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23096BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4050 kN C / 7700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23096B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23096B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23096bk",
      "23096BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24096B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24096B",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 480,
    "D_mm": 700,
    "B_mm": 218,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5200,
    "static_load_kN": 10500,
    "fatigue_load_limit_kN": 610,
    "limiting_speed_rpm": 380,
    "max_rpm": 380,
    "speed_oil_rpm": 490,
    "weight_g": 285000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24096B belongs to the 24000 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (24000 series); the bore code resolves to 480 mm (two-digit code ×5, with the 00–03 exception table), and 700 mm OD / 218 mm width follow the general plan. Two symmetric roller rows share the load: C 5200 kN, C0 10500 kN (C0/C ≈ 2.02), with useful axial capacity in either direction alongside the dominant radial load. Speed planning: 380 r/min grease limiting speed is the cage/kinematic ceiling and 490 r/min is the oil-lubricated value for the 480 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Fillet radii on shaft and housing must clear the ring chamfers of the 218 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 480 mm bore 24096B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24096B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Never substitute 24096B by envelope alone: the 10500 kN C0 and 610 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 380 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 480 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The 5200/10500 kN ratings, 610 kN Pu and 285000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24096B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24096B?",
        "a": "24096B is an NTN double-row spherical roller bearing to ISO 15: 480 mm bore, 700 mm OD and 218 mm width (18.898 × 27.559 × 8.583 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5200 kN, C0 10500 kN, Pu 610 kN, grease limiting speed 380 r/min, oil 490 r/min, mass about 285000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24096B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24096BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24096B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24096B?",
        "a": "24096B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24096B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5200 kN C / 10500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24096BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24096BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24096b",
      "24096B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24096BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24096BK30",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 480,
    "D_mm": 700,
    "B_mm": 218,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5200,
    "static_load_kN": 10500,
    "fatigue_load_limit_kN": 610,
    "limiting_speed_rpm": 380,
    "max_rpm": 380,
    "speed_oil_rpm": 490,
    "weight_g": 280000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24096BK30 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 480×700×218 mm to ISO 15, with pressed-steel cage (standard execution). On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (K30), lubrication feature (none); 24096BK30 is assembled exactly in that order. Two symmetric roller rows share the load: C 5200 kN, C0 10500 kN (C0/C ≈ 2.02), with useful axial capacity in either direction alongside the dominant radial load. Pu 610 kN against C0 10500 kN anchors the contamination derating; for dirty mining duty the adjusted life of 24096BK30 moves with cleanliness far more than with small C variations. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 480 mm bore 24096BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 480 mm bearing, and drive-up procedures differ.",
      "Do not confuse EA and EM at the same number: 24096BK30 carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 480×700 mm envelope is identical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 24096BK30 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 480 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The 5200/10500 kN ratings, 610 kN Pu and 280000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24096BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24096BK30?",
        "a": "24096BK30 is an NTN double-row spherical roller bearing to ISO 15: 480 mm bore, 700 mm OD and 218 mm width (18.898 × 27.559 × 8.583 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5200 kN, C0 10500 kN, Pu 610 kN, grease limiting speed 380 r/min, oil 490 r/min, mass about 280000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 24096BK30 mounts on a matching adapter or withdrawal sleeve on a plain 480 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24096B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24096BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24096BK30?",
        "a": "24096BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24096BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5200 kN C / 10500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24096B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24096B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24096bk30",
      "24096BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23196B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23196B",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 480,
    "D_mm": 790,
    "B_mm": 248,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 6900,
    "static_load_kN": 12300,
    "fatigue_load_limit_kN": 860,
    "limiting_speed_rpm": 350,
    "max_rpm": 350,
    "speed_oil_rpm": 450,
    "weight_g": 492000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23196B is the basic execution of NTN's spherical roller range for a 480 mm shaft — 6900 kN basic dynamic capacity in a 492000 g, open ISO 15 envelope. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (cylindrical), lubrication feature (none); 23196B is assembled exactly in that order. NTN prints two speeds for 23196B: 350 r/min grease and 450 r/min oil — the gap of 100 r/min reflects oil cooling of the heavy roller set. 480 mm bore is 18.898 in and 790 mm OD is 31.102 in; the ISO 15 envelope swaps between brands, but the 6900/12300 kN ratings and cage design are NTN 2203E values. Fillet radii on shaft and housing must clear the ring chamfers of the 248 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 480 mm bore 23196B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 6900 kN rating no longer applies.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 350 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 350 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Oil relubrication toward 450 r/min needs drain and level design; flooding the 248 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 6900/12300 kN ratings, 860 kN Pu and 492000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23196B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23196B?",
        "a": "23196B is an NTN double-row spherical roller bearing to ISO 15: 480 mm bore, 790 mm OD and 248 mm width (18.898 × 31.102 × 9.764 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 6900 kN, C0 12300 kN, Pu 860 kN, grease limiting speed 350 r/min, oil 450 r/min, mass about 492000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23196B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23196BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23196B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23196B?",
        "a": "23196B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23196B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 6900 kN C / 12300 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23196BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23196BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23196b",
      "23196B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23196BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23196BK",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 480,
    "D_mm": 790,
    "B_mm": 248,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 6900,
    "static_load_kN": 12300,
    "fatigue_load_limit_kN": 860,
    "limiting_speed_rpm": 350,
    "max_rpm": 350,
    "speed_oil_rpm": 450,
    "weight_g": 477000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 480 mm shaft, NTN supplies 23196BK: sphered outer raceway, two roller rows, pressed-steel cage (standard execution), oil speed 450 r/min. Numbering ties 23196BK to its envelope and execution: same-number EA versus EM or plain variants share the 480 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. The 155.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 248 mm-wide ring seats fully on both sides. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 480 mm bore 23196BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 23196BK by envelope alone: the 12300 kN C0 and 860 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23196B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 23196BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23196BK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 6900/12300 kN ratings, 860 kN Pu and 477000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23196BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23196BK?",
        "a": "23196BK is an NTN double-row spherical roller bearing to ISO 15: 480 mm bore, 790 mm OD and 248 mm width (18.898 × 31.102 × 9.764 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 6900 kN, C0 12300 kN, Pu 860 kN, grease limiting speed 350 r/min, oil 450 r/min, mass about 477000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23196BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23196B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23196BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23196BK?",
        "a": "23196BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23196BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 6900 kN C / 12300 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23196B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23196B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23196bk",
      "23196BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24196B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24196B",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 480,
    "D_mm": 790,
    "B_mm": 308,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 8250,
    "static_load_kN": 15300,
    "fatigue_load_limit_kN": 860,
    "limiting_speed_rpm": 350,
    "max_rpm": 350,
    "speed_oil_rpm": 450,
    "weight_g": 608000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 480 mm shaft, NTN supplies 24196B: sphered outer raceway, two roller rows, pressed-steel cage (standard execution), oil speed 450 r/min. Numbering ties 24196B to its envelope and execution: same-number EA versus EM or plain variants share the 480 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. At 8250 kN C and 608000 g mass the 24100 series part is built for shock and vibration; the 308 mm-wide ring needs square abutments to keep both rows equally loaded. With about 17.2 kN of C per millimetre of the 480 mm bore, 24196B screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Fillet radii on shaft and housing must clear the ring chamfers of the 308 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 480 mm bore 24196B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 480 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 480 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 24196B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 350 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 8250/15300 kN ratings, 860 kN Pu and 608000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24196B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24196B?",
        "a": "24196B is an NTN double-row spherical roller bearing to ISO 15: 480 mm bore, 790 mm OD and 308 mm width (18.898 × 31.102 × 12.126 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 8250 kN, C0 15300 kN, Pu 860 kN, grease limiting speed 350 r/min, oil 450 r/min, mass about 608000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24196B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24196BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24196B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24196B?",
        "a": "24196B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24196B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 8250 kN C / 15300 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24196BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24196BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24196b",
      "24196B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24196BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24196BK30",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 480,
    "D_mm": 790,
    "B_mm": 308,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 8250,
    "static_load_kN": 15300,
    "fatigue_load_limit_kN": 860,
    "limiting_speed_rpm": 350,
    "max_rpm": 350,
    "speed_oil_rpm": 450,
    "weight_g": 600000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 24196BK30 denotes the 480 mm bore spherical roller bearing (8250 kN C / 15300 kN C0) in the 24100 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 480 mm (two-digit code ×5, with the 00–03 exception table), and 790 mm OD / 308 mm width follow the general plan. The 1:30 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 480 mm bore assembly. Catalogue mass 600000 g (600.00 kg) for the 480×790×308 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Never mount 24196BK30 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 790 mm race.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 480 mm bore 24196BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24196BK30 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 24196BK30 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Never substitute 24196BK30 by envelope alone: the 15300 kN C0 and 860 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Do not confuse EA and EM at the same number: 24196BK30 carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 480×790 mm envelope is identical.",
      "The 8250/15300 kN ratings, 860 kN Pu and 600000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24196BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24196BK30?",
        "a": "24196BK30 is an NTN double-row spherical roller bearing to ISO 15: 480 mm bore, 790 mm OD and 308 mm width (18.898 × 31.102 × 12.126 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 8250 kN, C0 15300 kN, Pu 860 kN, grease limiting speed 350 r/min, oil 450 r/min, mass about 600000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24196BK30 mounts on a matching adapter or withdrawal sleeve on a plain 480 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24196B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24196BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24196BK30?",
        "a": "24196BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24196BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 8250 kN C / 15300 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24196B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24196B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24196bk30",
      "24196BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23296B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23296B",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 480,
    "D_mm": 870,
    "B_mm": 310,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 9200,
    "static_load_kN": 15500,
    "fatigue_load_limit_kN": 1000,
    "limiting_speed_rpm": 320,
    "max_rpm": 320,
    "speed_oil_rpm": 420,
    "weight_g": 814000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23296B denotes the 480 mm bore spherical roller bearing (9200 kN C / 15500 kN C0) in the 23200 series, the self-aligning choice for heavy combined load. Reading the full code: the number gives the 480×870 mm envelope, — names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and plain outer ring (no D1/W33 groove) completes the order number. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Equivalent-load planning keeps a radial plus moderate axial combination on 23296B; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 480 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 480 mm bore 23296B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 23296B by envelope alone: the 15500 kN C0 and 1000 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Oil relubrication toward 420 r/min needs drain and level design; flooding the 310 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 9200 kN rating no longer applies.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 480 mm bearing, and drive-up procedures differ.",
      "The 9200/15500 kN ratings, 1000 kN Pu and 814000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23296B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23296B?",
        "a": "23296B is an NTN double-row spherical roller bearing to ISO 15: 480 mm bore, 870 mm OD and 310 mm width (18.898 × 34.252 × 12.205 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 9200 kN, C0 15500 kN, Pu 1000 kN, grease limiting speed 320 r/min, oil 420 r/min, mass about 814000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23296B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23296BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23296B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23296B?",
        "a": "23296B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23296B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 9200 kN C / 15500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23296BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23296BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23296b",
      "23296B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23296BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23296BK",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 480,
    "D_mm": 870,
    "B_mm": 310,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 9200,
    "static_load_kN": 15500,
    "fatigue_load_limit_kN": 1000,
    "limiting_speed_rpm": 320,
    "max_rpm": 320,
    "speed_oil_rpm": 420,
    "weight_g": 790000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23296BK is the basic execution of NTN's spherical roller range for a 480 mm shaft — 9200 kN basic dynamic capacity in a 790000 g, open ISO 15 envelope. The leading digits are the ISO 15 dimension series (23200 series); the bore code resolves to 480 mm (two-digit code ×5, with the 00–03 exception table), and 870 mm OD / 310 mm width follow the general plan. The 195.0 mm radial section over the 480 mm bore carries two roller rows; capacity per millimetre of bore is about 19.2 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Equivalent-load planning keeps a radial plus moderate axial combination on 23296BK; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 23296BK leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 480 mm bore 23296BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 420 r/min needs drain and level design; flooding the 310 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Oil relubrication toward 420 r/min needs drain and level design; flooding the 310 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23296B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23296B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 9200/15500 kN ratings, 1000 kN Pu and 790000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23296BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23296BK?",
        "a": "23296BK is an NTN double-row spherical roller bearing to ISO 15: 480 mm bore, 870 mm OD and 310 mm width (18.898 × 34.252 × 12.205 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 9200 kN, C0 15500 kN, Pu 1000 kN, grease limiting speed 320 r/min, oil 420 r/min, mass about 790000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23296BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23296B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23296BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23296BK?",
        "a": "23296BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23296BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 9200 kN C / 15500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23296B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23296B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23296bk",
      "23296BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-500",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/500",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 500,
    "D_mm": 670,
    "B_mm": 128,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2640,
    "static_load_kN": 5600,
    "fatigue_load_limit_kN": 460,
    "limiting_speed_rpm": 430,
    "max_rpm": 430,
    "speed_oil_rpm": 560,
    "weight_g": 131000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 239/500 denotes the 500 mm bore spherical roller bearing (2640 kN C / 5600 kN C0) in the 23900 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 500 mm (two-digit code ×5, with the 00–03 exception table), and 670 mm OD / 128 mm width follow the general plan. Pu 460 kN is the catalogue fatigue load limit for 239/500, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. The 85.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 128 mm-wide ring seats fully on both sides. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 239/500 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 500 mm bore 239/500 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The cylindrical-bore 239/500 and its tapered-bore counterpart 239/500K share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 500 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 239/500 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 239/500 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 2640/5600 kN ratings, 460 kN Pu and 131000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/500 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/500?",
        "a": "239/500 is an NTN double-row spherical roller bearing to ISO 15: 500 mm bore, 670 mm OD and 128 mm width (19.685 × 26.378 × 5.039 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2640 kN, C0 5600 kN, Pu 460 kN, grease limiting speed 430 r/min, oil 560 r/min, mass about 131000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "239/500 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 239/500K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/500 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/500?",
        "a": "239/500 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/500 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2640 kN C / 5600 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-500K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 239-500K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-500"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-500K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/500K",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 500,
    "D_mm": 670,
    "B_mm": 128,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2640,
    "static_load_kN": 5600,
    "fatigue_load_limit_kN": 460,
    "limiting_speed_rpm": 430,
    "max_rpm": 430,
    "speed_oil_rpm": 560,
    "weight_g": 127000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "239/500K belongs to the 23900 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. Reading the full code: the number gives the 500×670 mm envelope, — names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. Open by design, 239/500K requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Grease/oil ratio: the 430 r/min limiting value is .77 of the 560 r/min oil value; heavy 128 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Mount 239/500K on its adapter or withdrawal sleeve on the 500 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 500 mm bore 239/500K is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 430 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 2640 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 500 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 2640 kN rating no longer applies.",
      "The 2640/5600 kN ratings, 460 kN Pu and 127000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/500K (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/500K?",
        "a": "239/500K is an NTN double-row spherical roller bearing to ISO 15: 500 mm bore, 670 mm OD and 128 mm width (19.685 × 26.378 × 5.039 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2640 kN, C0 5600 kN, Pu 460 kN, grease limiting speed 430 r/min, oil 560 r/min, mass about 127000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 239/500K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 239/500."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/500K is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/500K?",
        "a": "239/500K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/500K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2640 kN C / 5600 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-500",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 239-500 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-500k",
      "239-500K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "230-500B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 230/500B",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 500,
    "D_mm": 720,
    "B_mm": 167,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4250,
    "static_load_kN": 8300,
    "fatigue_load_limit_kN": 645,
    "limiting_speed_rpm": 410,
    "max_rpm": 410,
    "speed_oil_rpm": 530,
    "weight_g": 226000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "230/500B is the basic execution of NTN's spherical roller range for a 500 mm shaft — 4250 kN basic dynamic capacity in a 226000 g, open ISO 15 envelope. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (cylindrical), lubrication feature (none); 230/500B is assembled exactly in that order. The 110.0 mm radial section over the 500 mm bore carries two roller rows; capacity per millimetre of bore is about 8.5 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. With about 8.5 kN of C per millimetre of the 500 mm bore, 230/500B screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Fit the cylindrical-bore 230/500B with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 500 mm bore 230/500B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 230/500B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 500 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 500 mm bearing, and drive-up procedures differ.",
      "The cylindrical-bore 230/500B and its tapered-bore counterpart 230/500BK share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 4250/8300 kN ratings, 645 kN Pu and 226000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 230/500B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 230/500B?",
        "a": "230/500B is an NTN double-row spherical roller bearing to ISO 15: 500 mm bore, 720 mm OD and 167 mm width (19.685 × 28.346 × 6.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4250 kN, C0 8300 kN, Pu 645 kN, grease limiting speed 410 r/min, oil 530 r/min, mass about 226000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "230/500B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 230/500BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 230/500B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 230/500B?",
        "a": "230/500B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 230/500B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4250 kN C / 8300 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "230-500BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 230-500BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "230-500b",
      "230-500B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "230-500BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 230/500BK",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 500,
    "D_mm": 720,
    "B_mm": 167,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4250,
    "static_load_kN": 8300,
    "fatigue_load_limit_kN": 645,
    "limiting_speed_rpm": 410,
    "max_rpm": 410,
    "speed_oil_rpm": 530,
    "weight_g": 218000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "230/500BK belongs to the 23000 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (K), lubrication feature (none); 230/500BK is assembled exactly in that order. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Catalogue mass 218000 g (218.00 kg) for the 500×720×167 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Mount 230/500BK on its adapter or withdrawal sleeve on the 500 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 500 mm bore 230/500BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 167 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 500 mm bearing, and drive-up procedures differ.",
      "Oil relubrication toward 530 r/min needs drain and level design; flooding the 167 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 230/500BK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 4250/8300 kN ratings, 645 kN Pu and 218000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 230/500BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 230/500BK?",
        "a": "230/500BK is an NTN double-row spherical roller bearing to ISO 15: 500 mm bore, 720 mm OD and 167 mm width (19.685 × 28.346 × 6.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4250 kN, C0 8300 kN, Pu 645 kN, grease limiting speed 410 r/min, oil 530 r/min, mass about 218000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 230/500BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 230/500B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 230/500BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 230/500BK?",
        "a": "230/500BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 230/500BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4250 kN C / 8300 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "230-500B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 230-500B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "230-500bk",
      "230-500BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "240-500B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 240/500B",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 500,
    "D_mm": 720,
    "B_mm": 218,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5300,
    "static_load_kN": 10900,
    "fatigue_load_limit_kN": 640,
    "limiting_speed_rpm": 350,
    "max_rpm": 350,
    "speed_oil_rpm": 460,
    "weight_g": 295000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 240/500B with a cylindrical bore and plain outer ring (no D1/W33 groove): 500 mm bore, 720 mm OD, 218 mm width, rated 350 r/min on grease. The leading digits are the ISO 15 dimension series (24000 series); the bore code resolves to 500 mm (two-digit code ×5, with the 00–03 exception table), and 720 mm OD / 218 mm width follow the general plan. Open by design, 240/500B requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Grease/oil ratio: the 350 r/min limiting value is .76 of the 460 r/min oil value; heavy 218 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 500 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 500 mm bore 240/500B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 500 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 218 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 240/500B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 5300 kN rating no longer applies.",
      "The 5300/10900 kN ratings, 640 kN Pu and 295000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/500B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 240/500B?",
        "a": "240/500B is an NTN double-row spherical roller bearing to ISO 15: 500 mm bore, 720 mm OD and 218 mm width (19.685 × 28.346 × 8.583 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5300 kN, C0 10900 kN, Pu 640 kN, grease limiting speed 350 r/min, oil 460 r/min, mass about 295000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "240/500B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 240/500BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 240/500B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 240/500B?",
        "a": "240/500B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 240/500B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5300 kN C / 10900 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "240-500BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 240-500BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "240-500b",
      "240-500B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "240-500BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 240/500BK30",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 500,
    "D_mm": 720,
    "B_mm": 218,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5300,
    "static_load_kN": 10900,
    "fatigue_load_limit_kN": 640,
    "limiting_speed_rpm": 350,
    "max_rpm": 350,
    "speed_oil_rpm": 460,
    "weight_g": 290000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 240/500BK30 with a 1:30 tapered bore (K30) and plain outer ring (no D1/W33 groove): 500 mm bore, 720 mm OD, 218 mm width, rated 350 r/min on grease. Reading the full code: the number gives the 500×720 mm envelope, — names the cage/capacity execution, K30 marks the 1:30 tapered bore for sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. Suffix reading on 240/500BK30: the bare number is the standard open execution; K30 marks the 1:30 tapered bore of the wide series; B marks the standard large-bore internal design on slash-size 230–232 series; quote the full code because each suffix is a distinct article. The 110.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 218 mm-wide ring seats fully on both sides. Never mount 240/500BK30 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 720 mm race.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 500 mm bore 240/500BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 218 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Oil relubrication toward 460 r/min needs drain and level design; flooding the 218 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 240/500BK30 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 218 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 5300/10900 kN ratings, 640 kN Pu and 290000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/500BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 240/500BK30?",
        "a": "240/500BK30 is an NTN double-row spherical roller bearing to ISO 15: 500 mm bore, 720 mm OD and 218 mm width (19.685 × 28.346 × 8.583 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5300 kN, C0 10900 kN, Pu 640 kN, grease limiting speed 350 r/min, oil 460 r/min, mass about 290000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 240/500BK30 mounts on a matching adapter or withdrawal sleeve on a plain 500 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 240/500B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 240/500BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 240/500BK30?",
        "a": "240/500BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 240/500BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5300 kN C / 10900 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "240-500B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 240-500B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "240-500bk30",
      "240-500BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "231-500B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 231/500B",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 500,
    "D_mm": 830,
    "B_mm": 264,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 7700,
    "static_load_kN": 13700,
    "fatigue_load_limit_kN": 875,
    "limiting_speed_rpm": 330,
    "max_rpm": 330,
    "speed_oil_rpm": 430,
    "weight_g": 584000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "231/500B is the basic execution of NTN's spherical roller range for a 500 mm shaft — 7700 kN basic dynamic capacity in a 584000 g, open ISO 15 envelope. The leading digits are the ISO 15 dimension series (23100 series); the bore code resolves to 500 mm (two-digit code ×5, with the 00–03 exception table), and 830 mm OD / 264 mm width follow the general plan. Two symmetric roller rows share the load: C 7700 kN, C0 13700 kN (C0/C ≈ 1.78), with useful axial capacity in either direction alongside the dominant radial load. Pu 875 kN against C0 13700 kN anchors the contamination derating; for dirty mining duty the adjusted life of 231/500B moves with cleanliness far more than with small C variations. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 500 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 500 mm bore 231/500B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 7700 kN rating no longer applies.",
      "Oil relubrication toward 430 r/min needs drain and level design; flooding the 264 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 264 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 500 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The 7700/13700 kN ratings, 875 kN Pu and 584000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 231/500B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 231/500B?",
        "a": "231/500B is an NTN double-row spherical roller bearing to ISO 15: 500 mm bore, 830 mm OD and 264 mm width (19.685 × 32.677 × 10.394 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 7700 kN, C0 13700 kN, Pu 875 kN, grease limiting speed 330 r/min, oil 430 r/min, mass about 584000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "231/500B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 231/500BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 231/500B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 231/500B?",
        "a": "231/500B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 231/500B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 7700 kN C / 13700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "231-500BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 231-500BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "231-500b",
      "231-500B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "231-500BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 231/500BK",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 500,
    "D_mm": 830,
    "B_mm": 264,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 7700,
    "static_load_kN": 13700,
    "fatigue_load_limit_kN": 875,
    "limiting_speed_rpm": 330,
    "max_rpm": 330,
    "speed_oil_rpm": 430,
    "weight_g": 566000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "231/500BK is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 500×830×264 mm to ISO 15, with pressed-steel cage (standard execution). The leading digits are the ISO 15 dimension series (23100 series); the bore code resolves to 500 mm (two-digit code ×5, with the 00–03 exception table), and 830 mm OD / 264 mm width follow the general plan. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the basic cage. 500 mm bore is 19.685 in and 830 mm OD is 32.677 in; the ISO 15 envelope swaps between brands, but the 7700/13700 kN ratings and cage design are NTN 2203E values. Mount 231/500BK on its adapter or withdrawal sleeve on the 500 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 500 mm bore 231/500BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 500 mm bearing, and drive-up procedures differ.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 7700 kN rating no longer applies.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 231/500B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Never substitute 231/500BK by envelope alone: the 13700 kN C0 and 875 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The 7700/13700 kN ratings, 875 kN Pu and 566000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 231/500BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 231/500BK?",
        "a": "231/500BK is an NTN double-row spherical roller bearing to ISO 15: 500 mm bore, 830 mm OD and 264 mm width (19.685 × 32.677 × 10.394 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 7700 kN, C0 13700 kN, Pu 875 kN, grease limiting speed 330 r/min, oil 430 r/min, mass about 566000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 231/500BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 231/500B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 231/500BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 231/500BK?",
        "a": "231/500BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 231/500BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 7700 kN C / 13700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "231-500B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 231-500B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "231-500bk",
      "231-500BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "241-500B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 241/500B",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 500,
    "D_mm": 830,
    "B_mm": 325,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 9000,
    "static_load_kN": 16700,
    "fatigue_load_limit_kN": 870,
    "limiting_speed_rpm": 330,
    "max_rpm": 330,
    "speed_oil_rpm": 430,
    "weight_g": 716000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 241/500B with a cylindrical bore and plain outer ring (no D1/W33 groove): 500 mm bore, 830 mm OD, 325 mm width, rated 330 r/min on grease. Reading the full code: the number gives the 500×830 mm envelope, — names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and plain outer ring (no D1/W33 groove) completes the order number. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. With about 18.0 kN of C per millimetre of the 500 mm bore, 241/500B screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 500 mm set.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 500 mm bore 241/500B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 430 r/min needs drain and level design; flooding the 325 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 241/500B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 241/500B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 500 mm bearing, and drive-up procedures differ.",
      "The 9000/16700 kN ratings, 870 kN Pu and 716000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 241/500B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 241/500B?",
        "a": "241/500B is an NTN double-row spherical roller bearing to ISO 15: 500 mm bore, 830 mm OD and 325 mm width (19.685 × 32.677 × 12.795 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 9000 kN, C0 16700 kN, Pu 870 kN, grease limiting speed 330 r/min, oil 430 r/min, mass about 716000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "241/500B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 241/500BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 241/500B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 241/500B?",
        "a": "241/500B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 241/500B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 9000 kN C / 16700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "241-500BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 241-500BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "241-500b",
      "241-500B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "241-500BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 241/500BK30",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 500,
    "D_mm": 830,
    "B_mm": 325,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 9000,
    "static_load_kN": 16700,
    "fatigue_load_limit_kN": 870,
    "limiting_speed_rpm": 330,
    "max_rpm": 330,
    "speed_oil_rpm": 430,
    "weight_g": 705000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 500 mm shaft, NTN supplies 241/500BK30: sphered outer raceway, two roller rows, pressed-steel cage (standard execution), oil speed 430 r/min. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 500 mm (two-digit code ×5, with the 00–03 exception table), and 830 mm OD / 325 mm width follow the general plan. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. The 165.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 325 mm-wide ring seats fully on both sides. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 241/500BK30 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 500 mm bore 241/500BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 330 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Oil relubrication toward 430 r/min needs drain and level design; flooding the 325 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 9000 kN rating no longer applies.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 500 mm bearing, and drive-up procedures differ.",
      "The 9000/16700 kN ratings, 870 kN Pu and 705000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 241/500BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 241/500BK30?",
        "a": "241/500BK30 is an NTN double-row spherical roller bearing to ISO 15: 500 mm bore, 830 mm OD and 325 mm width (19.685 × 32.677 × 12.795 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 9000 kN, C0 16700 kN, Pu 870 kN, grease limiting speed 330 r/min, oil 430 r/min, mass about 705000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 241/500BK30 mounts on a matching adapter or withdrawal sleeve on a plain 500 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 241/500B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 241/500BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 241/500BK30?",
        "a": "241/500BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 241/500BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 9000 kN C / 16700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "241-500B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 241-500B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "241-500bk30",
      "241-500BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "232-500B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 232/500B",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 500,
    "D_mm": 920,
    "B_mm": 336,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 10500,
    "static_load_kN": 17800,
    "fatigue_load_limit_kN": 1100,
    "limiting_speed_rpm": 310,
    "max_rpm": 310,
    "speed_oil_rpm": 400,
    "weight_g": 1000000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 232/500B denotes the 500 mm bore spherical roller bearing (10500 kN C / 17800 kN C0) in the 23200 series, the self-aligning choice for heavy combined load. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (cylindrical), lubrication feature (none); 232/500B is assembled exactly in that order. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Catalogue mass 1000000 g (1000.00 kg) for the 500×920×336 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 500 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 500 mm bore 232/500B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 400 r/min needs drain and level design; flooding the 336 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 336 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The cylindrical-bore 232/500B and its tapered-bore counterpart 232/500BK share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 232/500B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 10500/17800 kN ratings, 1100 kN Pu and 1000000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 232/500B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 232/500B?",
        "a": "232/500B is an NTN double-row spherical roller bearing to ISO 15: 500 mm bore, 920 mm OD and 336 mm width (19.685 × 36.22 × 13.228 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 10500 kN, C0 17800 kN, Pu 1100 kN, grease limiting speed 310 r/min, oil 400 r/min, mass about 1000000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "232/500B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 232/500BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 232/500B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 232/500B?",
        "a": "232/500B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 232/500B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 10500 kN C / 17800 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "232-500BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 232-500BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "232-500b",
      "232-500B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "232-500BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 232/500BK",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 500,
    "D_mm": 920,
    "B_mm": 336,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 10500,
    "static_load_kN": 17800,
    "fatigue_load_limit_kN": 1100,
    "limiting_speed_rpm": 310,
    "max_rpm": 310,
    "speed_oil_rpm": 400,
    "weight_g": 971000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 232/500BK denotes the 500 mm bore spherical roller bearing (10500 kN C / 17800 kN C0) in the 23200 series, the self-aligning choice for heavy combined load. Reading the full code: the number gives the 500×920 mm envelope, — names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Grease/oil ratio: the 310 r/min limiting value is .78 of the 400 r/min oil value; heavy 336 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 500 mm set.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 500 mm bore 232/500BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 232/500BK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 310 r/min grease rating is lost to abrasive wear long before fatigue.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 500 mm bearing, and drive-up procedures differ.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 232/500BK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 10500/17800 kN ratings, 1100 kN Pu and 971000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 232/500BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 232/500BK?",
        "a": "232/500BK is an NTN double-row spherical roller bearing to ISO 15: 500 mm bore, 920 mm OD and 336 mm width (19.685 × 36.22 × 13.228 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 10500 kN, C0 17800 kN, Pu 1100 kN, grease limiting speed 310 r/min, oil 400 r/min, mass about 971000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 232/500BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 232/500B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 232/500BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 232/500BK?",
        "a": "232/500BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 232/500BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 10500 kN C / 17800 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "232-500B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 232-500B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "232-500bk",
      "232-500BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-530",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/530",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 530,
    "D_mm": 710,
    "B_mm": 136,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2940,
    "static_load_kN": 6450,
    "fatigue_load_limit_kN": 400,
    "limiting_speed_rpm": 400,
    "max_rpm": 400,
    "speed_oil_rpm": 520,
    "weight_g": 157000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "239/530 is the basic execution of NTN's spherical roller range for a 530 mm shaft — 2940 kN basic dynamic capacity in a 157000 g, open ISO 15 envelope. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (cylindrical), lubrication feature (none); 239/530 is assembled exactly in that order. The cylindrical bore fits a machined 530 mm shaft seat directly; the same envelope in 239/530K (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Pu 400 kN against C0 6450 kN anchors the contamination derating; for dirty mining duty the adjusted life of 239/530 moves with cleanliness far more than with small C variations. Fillet radii on shaft and housing must clear the ring chamfers of the 136 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 530 mm bore 239/530 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 530 mm bearing, and drive-up procedures differ.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 239/530 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Never substitute 239/530 by envelope alone: the 6450 kN C0 and 400 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Do not confuse EA and EM at the same number: 239/530 carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 530×710 mm envelope is identical.",
      "The 2940/6450 kN ratings, 400 kN Pu and 157000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/530 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/530?",
        "a": "239/530 is an NTN double-row spherical roller bearing to ISO 15: 530 mm bore, 710 mm OD and 136 mm width (20.866 × 27.953 × 5.354 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2940 kN, C0 6450 kN, Pu 400 kN, grease limiting speed 400 r/min, oil 520 r/min, mass about 157000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "239/530 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 239/530K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/530 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/530?",
        "a": "239/530 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/530 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2940 kN C / 6450 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-530K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 239-530K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-530"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-530K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/530K",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 530,
    "D_mm": 710,
    "B_mm": 136,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2940,
    "static_load_kN": 6450,
    "fatigue_load_limit_kN": 400,
    "limiting_speed_rpm": 400,
    "max_rpm": 400,
    "speed_oil_rpm": 520,
    "weight_g": 152000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 239/530K identifies a 530×710×136 mm (20.866 × 27.953 × 5.354 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Reading the full code: the number gives the 530×710 mm envelope, — names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. Suffix reading on 239/530K: the bare number is the standard open execution; K marks the 1:12 tapered bore; quote the full code because each suffix is a distinct article. Grease/oil ratio: the 400 r/min limiting value is .77 of the 520 r/min oil value; heavy 136 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 530 mm set.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 530 mm bore 239/530K is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 530 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Never substitute 239/530K by envelope alone: the 6450 kN C0 and 400 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 530 mm bearing, and drive-up procedures differ.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 136 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 2940/6450 kN ratings, 400 kN Pu and 152000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/530K (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/530K?",
        "a": "239/530K is an NTN double-row spherical roller bearing to ISO 15: 530 mm bore, 710 mm OD and 136 mm width (20.866 × 27.953 × 5.354 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2940 kN, C0 6450 kN, Pu 400 kN, grease limiting speed 400 r/min, oil 520 r/min, mass about 152000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 239/530K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 239/530."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/530K is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/530K?",
        "a": "239/530K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/530K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2940 kN C / 6450 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-530",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 239-530 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-530k",
      "239-530K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "230-530B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 230/530B",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 530,
    "D_mm": 780,
    "B_mm": 185,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4850,
    "static_load_kN": 9350,
    "fatigue_load_limit_kN": 710,
    "limiting_speed_rpm": 380,
    "max_rpm": 380,
    "speed_oil_rpm": 490,
    "weight_g": 306000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 230/530B with a cylindrical bore and plain outer ring (no D1/W33 groove): 530 mm bore, 780 mm OD, 185 mm width, rated 380 r/min on grease. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (cylindrical), lubrication feature (none); 230/530B is assembled exactly in that order. Pu 710 kN is the catalogue fatigue load limit for 230/530B, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. With about 9.2 kN of C per millimetre of the 530 mm bore, 230/530B screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 530 mm set.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 530 mm bore 230/530B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 380 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Oil relubrication toward 490 r/min needs drain and level design; flooding the 185 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 380 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 230/530B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 4850/9350 kN ratings, 710 kN Pu and 306000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 230/530B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 230/530B?",
        "a": "230/530B is an NTN double-row spherical roller bearing to ISO 15: 530 mm bore, 780 mm OD and 185 mm width (20.866 × 30.709 × 7.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4850 kN, C0 9350 kN, Pu 710 kN, grease limiting speed 380 r/min, oil 490 r/min, mass about 306000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "230/530B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 230/530BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 230/530B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 230/530B?",
        "a": "230/530B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 230/530B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4850 kN C / 9350 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "230-530BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 230-530BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "230-530b",
      "230-530B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "230-530BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 230/530BK",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 530,
    "D_mm": 780,
    "B_mm": 185,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4850,
    "static_load_kN": 9350,
    "fatigue_load_limit_kN": 710,
    "limiting_speed_rpm": 380,
    "max_rpm": 380,
    "speed_oil_rpm": 490,
    "weight_g": 295000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "230/530BK is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 530×780×185 mm to ISO 15, with pressed-steel cage (standard execution). The leading digits are the ISO 15 dimension series (23000 series); the bore code resolves to 530 mm (two-digit code ×5, with the 00–03 exception table), and 780 mm OD / 185 mm width follow the general plan. The 125.0 mm radial section over the 530 mm bore carries two roller rows; capacity per millimetre of bore is about 9.2 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Speed planning: 380 r/min grease limiting speed is the cage/kinematic ceiling and 490 r/min is the oil-lubricated value for the 530 mm bore; vibrating screens rarely approach either and are load/cage limited instead. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 230/530BK leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 530 mm bore 230/530BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 490 r/min needs drain and level design; flooding the 185 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 230/530BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 230/530BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 230/530B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 4850/9350 kN ratings, 710 kN Pu and 295000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 230/530BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 230/530BK?",
        "a": "230/530BK is an NTN double-row spherical roller bearing to ISO 15: 530 mm bore, 780 mm OD and 185 mm width (20.866 × 30.709 × 7.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4850 kN, C0 9350 kN, Pu 710 kN, grease limiting speed 380 r/min, oil 490 r/min, mass about 295000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 230/530BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 230/530B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 230/530BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 230/530BK?",
        "a": "230/530BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 230/530BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4850 kN C / 9350 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "230-530B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 230-530B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "230-530bk",
      "230-530BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "240-530B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 240/530B",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 530,
    "D_mm": 780,
    "B_mm": 250,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 6200,
    "static_load_kN": 12700,
    "fatigue_load_limit_kN": 700,
    "limiting_speed_rpm": 330,
    "max_rpm": 330,
    "speed_oil_rpm": 430,
    "weight_g": 413000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "240/530B is the basic execution of NTN's spherical roller range for a 530 mm shaft — 6200 kN basic dynamic capacity in a 413000 g, open ISO 15 envelope. The leading digits are the ISO 15 dimension series (24000 series); the bore code resolves to 530 mm (two-digit code ×5, with the 00–03 exception table), and 780 mm OD / 250 mm width follow the general plan. At 6200 kN C and 413000 g mass the 24000 series part is built for shock and vibration; the 250 mm-wide ring needs square abutments to keep both rows equally loaded. 530 mm bore is 20.866 in and 780 mm OD is 30.709 in; the ISO 15 envelope swaps between brands, but the 6200/12700 kN ratings and cage design are NTN 2203E values. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 240/530B leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 530 mm bore 240/530B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 240/530B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 530×780 mm envelope is identical.",
      "Do not confuse EA and EM at the same number: 240/530B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 530×780 mm envelope is identical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 240/530B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 330 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 6200/12700 kN ratings, 700 kN Pu and 413000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/530B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 240/530B?",
        "a": "240/530B is an NTN double-row spherical roller bearing to ISO 15: 530 mm bore, 780 mm OD and 250 mm width (20.866 × 30.709 × 9.843 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 6200 kN, C0 12700 kN, Pu 700 kN, grease limiting speed 330 r/min, oil 430 r/min, mass about 413000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "240/530B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 240/530BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 240/530B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 240/530B?",
        "a": "240/530B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 240/530B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 6200 kN C / 12700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "240-530BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 240-530BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "240-530b",
      "240-530B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "240-530BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 240/530BK30",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 530,
    "D_mm": 780,
    "B_mm": 250,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 6200,
    "static_load_kN": 12700,
    "fatigue_load_limit_kN": 700,
    "limiting_speed_rpm": 330,
    "max_rpm": 330,
    "speed_oil_rpm": 430,
    "weight_g": 406000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "240/530BK30 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 530×780×250 mm to ISO 15, with pressed-steel cage (standard execution). The leading digits are the ISO 15 dimension series (24000 series); the bore code resolves to 530 mm (two-digit code ×5, with the 00–03 exception table), and 780 mm OD / 250 mm width follow the general plan. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Equivalent-load planning keeps a radial plus moderate axial combination on 240/530BK30; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Mount 240/530BK30 on its adapter or withdrawal sleeve on the 530 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 530 mm bore 240/530BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 530 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 530 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 330 r/min grease rating is lost to abrasive wear long before fatigue.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 530 mm bearing, and drive-up procedures differ.",
      "The 6200/12700 kN ratings, 700 kN Pu and 406000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/530BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 240/530BK30?",
        "a": "240/530BK30 is an NTN double-row spherical roller bearing to ISO 15: 530 mm bore, 780 mm OD and 250 mm width (20.866 × 30.709 × 9.843 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 6200 kN, C0 12700 kN, Pu 700 kN, grease limiting speed 330 r/min, oil 430 r/min, mass about 406000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 240/530BK30 mounts on a matching adapter or withdrawal sleeve on a plain 530 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 240/530B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 240/530BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 240/530BK30?",
        "a": "240/530BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 240/530BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 6200 kN C / 12700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "240-530B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 240-530B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "240-530bk30",
      "240-530BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "231-530B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 231/530B",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 530,
    "D_mm": 870,
    "B_mm": 272,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 7800,
    "static_load_kN": 14200,
    "fatigue_load_limit_kN": 920,
    "limiting_speed_rpm": 310,
    "max_rpm": 310,
    "speed_oil_rpm": 400,
    "weight_g": 653000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 231/530B with a cylindrical bore and plain outer ring (no D1/W33 groove): 530 mm bore, 870 mm OD, 272 mm width, rated 310 r/min on grease. The leading digits are the ISO 15 dimension series (23100 series); the bore code resolves to 530 mm (two-digit code ×5, with the 00–03 exception table), and 870 mm OD / 272 mm width follow the general plan. The cylindrical bore fits a machined 530 mm shaft seat directly; the same envelope in 231/530BK (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Pu 920 kN against C0 14200 kN anchors the contamination derating; for dirty mining duty the adjusted life of 231/530B moves with cleanliness far more than with small C variations. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 530 mm bore 231/530B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 272 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The cylindrical-bore 231/530B and its tapered-bore counterpart 231/530BK share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The cylindrical-bore 231/530B and its tapered-bore counterpart 231/530BK share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Do not confuse EA and EM at the same number: 231/530B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 530×870 mm envelope is identical.",
      "The 7800/14200 kN ratings, 920 kN Pu and 653000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 231/530B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 231/530B?",
        "a": "231/530B is an NTN double-row spherical roller bearing to ISO 15: 530 mm bore, 870 mm OD and 272 mm width (20.866 × 34.252 × 10.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 7800 kN, C0 14200 kN, Pu 920 kN, grease limiting speed 310 r/min, oil 400 r/min, mass about 653000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "231/530B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 231/530BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 231/530B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 231/530B?",
        "a": "231/530B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 231/530B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 7800 kN C / 14200 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "231-530BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 231-530BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "231-530b",
      "231-530B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "231-530BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 231/530BK",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 530,
    "D_mm": 870,
    "B_mm": 272,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 7800,
    "static_load_kN": 14200,
    "fatigue_load_limit_kN": 920,
    "limiting_speed_rpm": 310,
    "max_rpm": 310,
    "speed_oil_rpm": 400,
    "weight_g": 633000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 231/530BK denotes the 530 mm bore spherical roller bearing (7800 kN C / 14200 kN C0) in the 23100 series, the self-aligning choice for heavy combined load. Reading the full code: the number gives the 530×870 mm envelope, — names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Catalogue mass 633000 g (633.00 kg) for the 530×870×272 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 231/530BK leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 530 mm bore 231/530BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 231/530BK by envelope alone: the 14200 kN C0 and 920 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Never substitute 231/530BK by envelope alone: the 14200 kN C0 and 920 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 7800 kN rating no longer applies.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 231/530BK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 7800/14200 kN ratings, 920 kN Pu and 633000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 231/530BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 231/530BK?",
        "a": "231/530BK is an NTN double-row spherical roller bearing to ISO 15: 530 mm bore, 870 mm OD and 272 mm width (20.866 × 34.252 × 10.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 7800 kN, C0 14200 kN, Pu 920 kN, grease limiting speed 310 r/min, oil 400 r/min, mass about 633000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 231/530BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 231/530B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 231/530BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 231/530BK?",
        "a": "231/530BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 231/530BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 7800 kN C / 14200 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "231-530B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 231-530B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "231-530bk",
      "231-530BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "241-530B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 241/530B",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 530,
    "D_mm": 870,
    "B_mm": 335,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 9250,
    "static_load_kN": 17400,
    "fatigue_load_limit_kN": 910,
    "limiting_speed_rpm": 310,
    "max_rpm": 310,
    "speed_oil_rpm": 400,
    "weight_g": 800000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 241/530B denotes the 530 mm bore spherical roller bearing (9250 kN C / 17400 kN C0) in the 24100 series, the self-aligning choice for heavy combined load. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (cylindrical), lubrication feature (none); 241/530B is assembled exactly in that order. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the basic cage. Grease/oil ratio: the 310 r/min limiting value is .78 of the 400 r/min oil value; heavy 335 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 241/530B leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 530 mm bore 241/530B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 335 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 530 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Do not confuse EA and EM at the same number: 241/530B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 530×870 mm envelope is identical.",
      "Never substitute 241/530B by envelope alone: the 17400 kN C0 and 910 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The 9250/17400 kN ratings, 910 kN Pu and 800000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 241/530B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 241/530B?",
        "a": "241/530B is an NTN double-row spherical roller bearing to ISO 15: 530 mm bore, 870 mm OD and 335 mm width (20.866 × 34.252 × 13.189 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 9250 kN, C0 17400 kN, Pu 910 kN, grease limiting speed 310 r/min, oil 400 r/min, mass about 800000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "241/530B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 241/530BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 241/530B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 241/530B?",
        "a": "241/530B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 241/530B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 9250 kN C / 17400 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "241-530BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 241-530BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "241-530b",
      "241-530B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "241-530BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 241/530BK30",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 530,
    "D_mm": 870,
    "B_mm": 335,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 9250,
    "static_load_kN": 17400,
    "fatigue_load_limit_kN": 910,
    "limiting_speed_rpm": 310,
    "max_rpm": 310,
    "speed_oil_rpm": 400,
    "weight_g": 788000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 241/530BK30 with a 1:30 tapered bore (K30) and plain outer ring (no D1/W33 groove): 530 mm bore, 870 mm OD, 335 mm width, rated 310 r/min on grease. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (K30), lubrication feature (none); 241/530BK30 is assembled exactly in that order. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Equivalent-load planning keeps a radial plus moderate axial combination on 241/530BK30; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Fillet radii on shaft and housing must clear the ring chamfers of the 335 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 530 mm bore 241/530BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 241/530BK30 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 530 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 335 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 241/530BK30 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 9250/17400 kN ratings, 910 kN Pu and 788000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 241/530BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 241/530BK30?",
        "a": "241/530BK30 is an NTN double-row spherical roller bearing to ISO 15: 530 mm bore, 870 mm OD and 335 mm width (20.866 × 34.252 × 13.189 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 9250 kN, C0 17400 kN, Pu 910 kN, grease limiting speed 310 r/min, oil 400 r/min, mass about 788000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 241/530BK30 mounts on a matching adapter or withdrawal sleeve on a plain 530 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 241/530B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 241/530BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 241/530BK30?",
        "a": "241/530BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 241/530BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 9250 kN C / 17400 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "241-530B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 241-530B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "241-530bk30",
      "241-530BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "232-530B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 232/530B",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 530,
    "D_mm": 980,
    "B_mm": 355,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 11500,
    "static_load_kN": 19800,
    "fatigue_load_limit_kN": 1210,
    "limiting_speed_rpm": 280,
    "max_rpm": 280,
    "speed_oil_rpm": 370,
    "weight_g": 1200000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "232/530B is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 530×980×355 mm to ISO 15, with pressed-steel cage (standard execution). On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (cylindrical), lubrication feature (none); 232/530B is assembled exactly in that order. At 11500 kN C and 1200000 g mass the 23200 series part is built for shock and vibration; the 355 mm-wide ring needs square abutments to keep both rows equally loaded. Pu 1210 kN against C0 19800 kN anchors the contamination derating; for dirty mining duty the adjusted life of 232/530B moves with cleanliness far more than with small C variations. Never mount 232/530B by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 980 mm race.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 530 mm bore 232/530B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 530 mm bearing, and drive-up procedures differ.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 232/530B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Never substitute 232/530B by envelope alone: the 19800 kN C0 and 1210 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 280 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 11500/19800 kN ratings, 1210 kN Pu and 1200000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 232/530B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 232/530B?",
        "a": "232/530B is an NTN double-row spherical roller bearing to ISO 15: 530 mm bore, 980 mm OD and 355 mm width (20.866 × 38.583 × 13.976 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 11500 kN, C0 19800 kN, Pu 1210 kN, grease limiting speed 280 r/min, oil 370 r/min, mass about 1200000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "232/530B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 232/530BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 232/530B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 232/530B?",
        "a": "232/530B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 232/530B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 11500 kN C / 19800 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "232-530BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 232-530BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "232-530b",
      "232-530B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "232-530BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 232/530BK",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 530,
    "D_mm": 980,
    "B_mm": 355,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 11500,
    "static_load_kN": 19800,
    "fatigue_load_limit_kN": 1210,
    "limiting_speed_rpm": 280,
    "max_rpm": 280,
    "speed_oil_rpm": 370,
    "weight_g": 1170000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "232/530BK is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 530×980×355 mm to ISO 15, with pressed-steel cage (standard execution). Numbering ties 232/530BK to its envelope and execution: same-number EA versus EM or plain variants share the 530 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Suffix reading on 232/530BK: the bare number is the standard open execution; K marks the 1:12 tapered bore; B marks the standard large-bore internal design on slash-size 230–232 series; quote the full code because each suffix is a distinct article. With about 21.7 kN of C per millimetre of the 530 mm bore, 232/530BK screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Mount 232/530BK on its adapter or withdrawal sleeve on the 530 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 530 mm bore 232/530BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 232/530B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 232/530BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 280 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 355 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 11500/19800 kN ratings, 1210 kN Pu and 1170000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 232/530BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 232/530BK?",
        "a": "232/530BK is an NTN double-row spherical roller bearing to ISO 15: 530 mm bore, 980 mm OD and 355 mm width (20.866 × 38.583 × 13.976 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 11500 kN, C0 19800 kN, Pu 1210 kN, grease limiting speed 280 r/min, oil 370 r/min, mass about 1170000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 232/530BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 232/530B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 232/530BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 232/530BK?",
        "a": "232/530BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 232/530BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 11500 kN C / 19800 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "232-530B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 232-530B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "232-530bk",
      "232-530BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-560",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/560",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 560,
    "D_mm": 750,
    "B_mm": 140,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 3200,
    "static_load_kN": 6900,
    "fatigue_load_limit_kN": 525,
    "limiting_speed_rpm": 380,
    "max_rpm": 380,
    "speed_oil_rpm": 490,
    "weight_g": 182000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 239/560 identifies a 560×750×140 mm (22.047 × 29.528 × 5.512 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 560 mm bore; the 140 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. NTN prints two speeds for 239/560: 380 r/min grease and 490 r/min oil — the gap of 110 r/min reflects oil cooling of the heavy roller set. 560 mm bore is 22.047 in and 750 mm OD is 29.528 in; the ISO 15 envelope swaps between brands, but the 3200/6900 kN ratings and cage design are NTN 2203E values. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 560 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 560 mm bore 239/560 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 3200 kN rating no longer applies.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 239/560 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 560 mm bearing, and drive-up procedures differ.",
      "Oil relubrication toward 490 r/min needs drain and level design; flooding the 140 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 3200/6900 kN ratings, 525 kN Pu and 182000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/560 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/560?",
        "a": "239/560 is an NTN double-row spherical roller bearing to ISO 15: 560 mm bore, 750 mm OD and 140 mm width (22.047 × 29.528 × 5.512 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3200 kN, C0 6900 kN, Pu 525 kN, grease limiting speed 380 r/min, oil 490 r/min, mass about 182000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "239/560 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 239/560K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/560 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/560?",
        "a": "239/560 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/560 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3200 kN C / 6900 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-560K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 239-560K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-560"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-560K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/560K",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 560,
    "D_mm": 750,
    "B_mm": 140,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 3200,
    "static_load_kN": 6900,
    "fatigue_load_limit_kN": 525,
    "limiting_speed_rpm": 380,
    "max_rpm": 380,
    "speed_oil_rpm": 490,
    "weight_g": 176000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 560 mm shaft, NTN supplies 239/560K: sphered outer raceway, two roller rows, pressed-steel cage (standard execution), oil speed 490 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (K), lubrication feature (none); 239/560K is assembled exactly in that order. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the basic cage. Equivalent-load planning keeps a radial plus moderate axial combination on 239/560K; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Fillet radii on shaft and housing must clear the ring chamfers of the 140 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 560 mm bore 239/560K is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 380 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 380 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 140 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 239/560K by envelope alone: the 6900 kN C0 and 525 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The 3200/6900 kN ratings, 525 kN Pu and 176000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/560K (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/560K?",
        "a": "239/560K is an NTN double-row spherical roller bearing to ISO 15: 560 mm bore, 750 mm OD and 140 mm width (22.047 × 29.528 × 5.512 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3200 kN, C0 6900 kN, Pu 525 kN, grease limiting speed 380 r/min, oil 490 r/min, mass about 176000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 239/560K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 239/560."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/560K is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/560K?",
        "a": "239/560K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/560K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3200 kN C / 6900 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-560",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 239-560 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-560k",
      "239-560K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "230-560B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 230/560B",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 560,
    "D_mm": 820,
    "B_mm": 195,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5350,
    "static_load_kN": 10500,
    "fatigue_load_limit_kN": 800,
    "limiting_speed_rpm": 350,
    "max_rpm": 350,
    "speed_oil_rpm": 450,
    "weight_g": 353000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 230/560B denotes the 560 mm bore spherical roller bearing (5350 kN C / 10500 kN C0) in the 23000 series, the self-aligning choice for heavy combined load. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (cylindrical), lubrication feature (none); 230/560B is assembled exactly in that order. The cylindrical bore fits a machined 560 mm shaft seat directly; the same envelope in 230/560BK (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Catalogue mass 353000 g (353.00 kg) for the 560×820×195 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Fillet radii on shaft and housing must clear the ring chamfers of the 195 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 560 mm bore 230/560B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 560 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The cylindrical-bore 230/560B and its tapered-bore counterpart 230/560BK share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The cylindrical-bore 230/560B and its tapered-bore counterpart 230/560BK share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Do not confuse EA and EM at the same number: 230/560B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 560×820 mm envelope is identical.",
      "The 5350/10500 kN ratings, 800 kN Pu and 353000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 230/560B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 230/560B?",
        "a": "230/560B is an NTN double-row spherical roller bearing to ISO 15: 560 mm bore, 820 mm OD and 195 mm width (22.047 × 32.283 × 7.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5350 kN, C0 10500 kN, Pu 800 kN, grease limiting speed 350 r/min, oil 450 r/min, mass about 353000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "230/560B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 230/560BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 230/560B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 230/560B?",
        "a": "230/560B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 230/560B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5350 kN C / 10500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "230-560BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 230-560BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "230-560b",
      "230-560B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "230-560BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 230/560BK",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 560,
    "D_mm": 820,
    "B_mm": 195,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5350,
    "static_load_kN": 10500,
    "fatigue_load_limit_kN": 800,
    "limiting_speed_rpm": 350,
    "max_rpm": 350,
    "speed_oil_rpm": 450,
    "weight_g": 340000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 230/560BK denotes the 560 mm bore spherical roller bearing (5350 kN C / 10500 kN C0) in the 23000 series, the self-aligning choice for heavy combined load. Reading the full code: the number gives the 560×820 mm envelope, — names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. Pu 800 kN is the catalogue fatigue load limit for 230/560BK, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. The 130.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 195 mm-wide ring seats fully on both sides. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 560 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 560 mm bore 230/560BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 560 mm bearing, and drive-up procedures differ.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 5350 kN rating no longer applies.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 195 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 230/560BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 5350/10500 kN ratings, 800 kN Pu and 340000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 230/560BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 230/560BK?",
        "a": "230/560BK is an NTN double-row spherical roller bearing to ISO 15: 560 mm bore, 820 mm OD and 195 mm width (22.047 × 32.283 × 7.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5350 kN, C0 10500 kN, Pu 800 kN, grease limiting speed 350 r/min, oil 450 r/min, mass about 340000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 230/560BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 230/560B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 230/560BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 230/560BK?",
        "a": "230/560BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 230/560BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5350 kN C / 10500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "230-560B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 230-560B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "230-560bk",
      "230-560BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "240-560B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 240/560B",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 560,
    "D_mm": 820,
    "B_mm": 258,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 6750,
    "static_load_kN": 14100,
    "fatigue_load_limit_kN": 750,
    "limiting_speed_rpm": 310,
    "max_rpm": 310,
    "speed_oil_rpm": 400,
    "weight_g": 467000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 240/560B with a cylindrical bore and plain outer ring (no D1/W33 groove): 560 mm bore, 820 mm OD, 258 mm width, rated 310 r/min on grease. The leading digits are the ISO 15 dimension series (24000 series); the bore code resolves to 560 mm (two-digit code ×5, with the 00–03 exception table), and 820 mm OD / 258 mm width follow the general plan. Two symmetric roller rows share the load: C 6750 kN, C0 14100 kN (C0/C ≈ 2.09), with useful axial capacity in either direction alongside the dominant radial load. 560 mm bore is 22.047 in and 820 mm OD is 32.283 in; the ISO 15 envelope swaps between brands, but the 6750/14100 kN ratings and cage design are NTN 2203E values. Fillet radii on shaft and housing must clear the ring chamfers of the 258 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 560 mm bore 240/560B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 6750 kN rating no longer applies.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 560 mm bearing, and drive-up procedures differ.",
      "Do not confuse EA and EM at the same number: 240/560B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 560×820 mm envelope is identical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 560 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The 6750/14100 kN ratings, 750 kN Pu and 467000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/560B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 240/560B?",
        "a": "240/560B is an NTN double-row spherical roller bearing to ISO 15: 560 mm bore, 820 mm OD and 258 mm width (22.047 × 32.283 × 10.157 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 6750 kN, C0 14100 kN, Pu 750 kN, grease limiting speed 310 r/min, oil 400 r/min, mass about 467000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "240/560B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 240/560BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 240/560B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 240/560B?",
        "a": "240/560B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 240/560B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 6750 kN C / 14100 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "240-560BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 240-560BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "240-560b",
      "240-560B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "240-560BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 240/560BK30",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 560,
    "D_mm": 820,
    "B_mm": 258,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 6750,
    "static_load_kN": 14100,
    "fatigue_load_limit_kN": 750,
    "limiting_speed_rpm": 310,
    "max_rpm": 310,
    "speed_oil_rpm": 400,
    "weight_g": 459000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 240/560BK30 identifies a 560×820×258 mm (22.047 × 32.283 × 10.157 in) spherical roller bearing, 1:30 tapered bore (K30), to the ISO 15 boundary plan. Reading the full code: the number gives the 560×820 mm envelope, — names the cage/capacity execution, K30 marks the 1:30 tapered bore for sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. With about 12.1 kN of C per millimetre of the 560 mm bore, 240/560BK30 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 560 mm set.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 560 mm bore 240/560BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 310 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 240/560BK30 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 560 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 240/560BK30 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 6750/14100 kN ratings, 750 kN Pu and 459000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/560BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 240/560BK30?",
        "a": "240/560BK30 is an NTN double-row spherical roller bearing to ISO 15: 560 mm bore, 820 mm OD and 258 mm width (22.047 × 32.283 × 10.157 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 6750 kN, C0 14100 kN, Pu 750 kN, grease limiting speed 310 r/min, oil 400 r/min, mass about 459000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 240/560BK30 mounts on a matching adapter or withdrawal sleeve on a plain 560 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 240/560B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 240/560BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 240/560BK30?",
        "a": "240/560BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 240/560BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 6750 kN C / 14100 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "240-560B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 240-560B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "240-560bk30",
      "240-560BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "231-560B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 231/560B",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 560,
    "D_mm": 920,
    "B_mm": 280,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 8550,
    "static_load_kN": 15500,
    "fatigue_load_limit_kN": 1000,
    "limiting_speed_rpm": 280,
    "max_rpm": 280,
    "speed_oil_rpm": 370,
    "weight_g": 752000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 231/560B denotes the 560 mm bore spherical roller bearing (8550 kN C / 15500 kN C0) in the 23100 series, the self-aligning choice for heavy combined load. Digit by digit the code reads as spherical-roller dimension series plus 560 mm bore; the 280 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. NTN prints two speeds for 231/560B: 280 r/min grease and 370 r/min oil — the gap of 90 r/min reflects oil cooling of the heavy roller set. Catalogue mass 752000 g (752.00 kg) for the 560×920×280 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Fit the cylindrical-bore 231/560B with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 560 mm bore 231/560B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 8550 kN rating no longer applies.",
      "Do not confuse EA and EM at the same number: 231/560B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 560×920 mm envelope is identical.",
      "Never substitute 231/560B by envelope alone: the 15500 kN C0 and 1000 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Oil relubrication toward 370 r/min needs drain and level design; flooding the 280 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 8550/15500 kN ratings, 1000 kN Pu and 752000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 231/560B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 231/560B?",
        "a": "231/560B is an NTN double-row spherical roller bearing to ISO 15: 560 mm bore, 920 mm OD and 280 mm width (22.047 × 36.22 × 11.024 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 8550 kN, C0 15500 kN, Pu 1000 kN, grease limiting speed 280 r/min, oil 370 r/min, mass about 752000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "231/560B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 231/560BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 231/560B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 231/560B?",
        "a": "231/560B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 231/560B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 8550 kN C / 15500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "231-560BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 231-560BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "231-560b",
      "231-560B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "231-560BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 231/560BK",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 560,
    "D_mm": 920,
    "B_mm": 280,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 8550,
    "static_load_kN": 15500,
    "fatigue_load_limit_kN": 1000,
    "limiting_speed_rpm": 280,
    "max_rpm": 280,
    "speed_oil_rpm": 370,
    "weight_g": 729000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 231/560BK with a 1:12 tapered bore (K) and plain outer ring (no D1/W33 groove): 560 mm bore, 920 mm OD, 280 mm width, rated 280 r/min on grease. Numbering ties 231/560BK to its envelope and execution: same-number EA versus EM or plain variants share the 560 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The 180.0 mm radial section over the 560 mm bore carries two roller rows; capacity per millimetre of bore is about 15.3 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Speed planning: 280 r/min grease limiting speed is the cage/kinematic ceiling and 370 r/min is the oil-lubricated value for the 560 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 560 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 560 mm bore 231/560BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 231/560BK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 280 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 231/560BK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 231/560B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 8550/15500 kN ratings, 1000 kN Pu and 729000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 231/560BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 231/560BK?",
        "a": "231/560BK is an NTN double-row spherical roller bearing to ISO 15: 560 mm bore, 920 mm OD and 280 mm width (22.047 × 36.22 × 11.024 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 8550 kN, C0 15500 kN, Pu 1000 kN, grease limiting speed 280 r/min, oil 370 r/min, mass about 729000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 231/560BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 231/560B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 231/560BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 231/560BK?",
        "a": "231/560BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 231/560BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 8550 kN C / 15500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "231-560B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 231-560B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "231-560bk",
      "231-560BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "241-560B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 241/560B",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 560,
    "D_mm": 920,
    "B_mm": 355,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 11100,
    "static_load_kN": 20800,
    "fatigue_load_limit_kN": 1030,
    "limiting_speed_rpm": 280,
    "max_rpm": 280,
    "speed_oil_rpm": 370,
    "weight_g": 948000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 241/560B with a cylindrical bore and plain outer ring (no D1/W33 groove): 560 mm bore, 920 mm OD, 355 mm width, rated 280 r/min on grease. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (cylindrical), lubrication feature (none); 241/560B is assembled exactly in that order. Suffix reading on 241/560B: the bare number is the standard open execution; B marks the standard large-bore internal design on slash-size 230–232 series; quote the full code because each suffix is a distinct article. 560 mm bore is 22.047 in and 920 mm OD is 36.22 in; the ISO 15 envelope swaps between brands, but the 11100/20800 kN ratings and cage design are NTN 2203E values. Fit the cylindrical-bore 241/560B with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 560 mm bore 241/560B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 370 r/min needs drain and level design; flooding the 355 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 241/560B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 280 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 355 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 11100/20800 kN ratings, 1030 kN Pu and 948000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 241/560B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 241/560B?",
        "a": "241/560B is an NTN double-row spherical roller bearing to ISO 15: 560 mm bore, 920 mm OD and 355 mm width (22.047 × 36.22 × 13.976 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 11100 kN, C0 20800 kN, Pu 1030 kN, grease limiting speed 280 r/min, oil 370 r/min, mass about 948000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "241/560B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 241/560BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 241/560B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 241/560B?",
        "a": "241/560B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 241/560B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 11100 kN C / 20800 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "241-560BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 241-560BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "241-560b",
      "241-560B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "241-560BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 241/560BK30",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 560,
    "D_mm": 920,
    "B_mm": 355,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 11100,
    "static_load_kN": 20800,
    "fatigue_load_limit_kN": 1030,
    "limiting_speed_rpm": 280,
    "max_rpm": 280,
    "speed_oil_rpm": 370,
    "weight_g": 934000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "241/560BK30 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 560×920×355 mm to ISO 15, with pressed-steel cage (standard execution). The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 560 mm (two-digit code ×5, with the 00–03 exception table), and 920 mm OD / 355 mm width follow the general plan. Pu 1030 kN is the catalogue fatigue load limit for 241/560BK30, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. With about 19.8 kN of C per millimetre of the 560 mm bore, 241/560BK30 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 560 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 560 mm bore 241/560BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 241/560BK30 by envelope alone: the 20800 kN C0 and 1030 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 241/560BK30 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Oil relubrication toward 370 r/min needs drain and level design; flooding the 355 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 241/560BK30 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 11100/20800 kN ratings, 1030 kN Pu and 934000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 241/560BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 241/560BK30?",
        "a": "241/560BK30 is an NTN double-row spherical roller bearing to ISO 15: 560 mm bore, 920 mm OD and 355 mm width (22.047 × 36.22 × 13.976 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 11100 kN, C0 20800 kN, Pu 1030 kN, grease limiting speed 280 r/min, oil 370 r/min, mass about 934000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 241/560BK30 mounts on a matching adapter or withdrawal sleeve on a plain 560 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 241/560B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 241/560BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 241/560BK30?",
        "a": "241/560BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 241/560BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 11100 kN C / 20800 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "241-560B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 241-560B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "241-560bk30",
      "241-560BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "232-560B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 232/560B",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 560,
    "D_mm": 1030,
    "B_mm": 365,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 12300,
    "static_load_kN": 21100,
    "fatigue_load_limit_kN": 1320,
    "limiting_speed_rpm": 260,
    "max_rpm": 260,
    "speed_oil_rpm": 340,
    "weight_g": 1360000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 232/560B denotes the 560 mm bore spherical roller bearing (12300 kN C / 21100 kN C0) in the 23200 series, the self-aligning choice for heavy combined load. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (cylindrical), lubrication feature (none); 232/560B is assembled exactly in that order. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Pu 1320 kN against C0 21100 kN anchors the contamination derating; for dirty mining duty the adjusted life of 232/560B moves with cleanliness far more than with small C variations. Fillet radii on shaft and housing must clear the ring chamfers of the 365 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 560 mm bore 232/560B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 232/560B by envelope alone: the 21100 kN C0 and 1320 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 560 mm bearing, and drive-up procedures differ.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 560 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 560 mm bearing, and drive-up procedures differ.",
      "The 12300/21100 kN ratings, 1320 kN Pu and 1360000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 232/560B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 232/560B?",
        "a": "232/560B is an NTN double-row spherical roller bearing to ISO 15: 560 mm bore, 1030 mm OD and 365 mm width (22.047 × 40.551 × 14.37 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 12300 kN, C0 21100 kN, Pu 1320 kN, grease limiting speed 260 r/min, oil 340 r/min, mass about 1360000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "232/560B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 232/560BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 232/560B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 232/560B?",
        "a": "232/560B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 232/560B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 12300 kN C / 21100 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "232-560BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 232-560BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "232-560b",
      "232-560B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "232-560BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 232/560BK",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 560,
    "D_mm": 1030,
    "B_mm": 365,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 12300,
    "static_load_kN": 21100,
    "fatigue_load_limit_kN": 1320,
    "limiting_speed_rpm": 260,
    "max_rpm": 260,
    "speed_oil_rpm": 340,
    "weight_g": 1320000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 232/560BK denotes the 560 mm bore spherical roller bearing (12300 kN C / 21100 kN C0) in the 23200 series, the self-aligning choice for heavy combined load. Digit by digit the code reads as spherical-roller dimension series plus 560 mm bore; the 365 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. NTN prints two speeds for 232/560BK: 260 r/min grease and 340 r/min oil — the gap of 80 r/min reflects oil cooling of the heavy roller set. Pu 1320 kN against C0 21100 kN anchors the contamination derating; for dirty mining duty the adjusted life of 232/560BK moves with cleanliness far more than with small C variations. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 232/560BK leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 560 mm bore 232/560BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 232/560BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 12300 kN rating no longer applies.",
      "Oil relubrication toward 340 r/min needs drain and level design; flooding the 365 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Oil relubrication toward 340 r/min needs drain and level design; flooding the 365 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 12300/21100 kN ratings, 1320 kN Pu and 1320000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 232/560BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 232/560BK?",
        "a": "232/560BK is an NTN double-row spherical roller bearing to ISO 15: 560 mm bore, 1030 mm OD and 365 mm width (22.047 × 40.551 × 14.37 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 12300 kN, C0 21100 kN, Pu 1320 kN, grease limiting speed 260 r/min, oil 340 r/min, mass about 1320000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 232/560BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 232/560B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 232/560BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 232/560BK?",
        "a": "232/560BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 232/560BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 12300 kN C / 21100 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "232-560B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 232-560B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "232-560bk",
      "232-560BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-600",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/600",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 600,
    "D_mm": 800,
    "B_mm": 150,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 3600,
    "static_load_kN": 8000,
    "fatigue_load_limit_kN": 490,
    "limiting_speed_rpm": 350,
    "max_rpm": 350,
    "speed_oil_rpm": 450,
    "weight_g": 218000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "239/600 is the basic execution of NTN's spherical roller range for a 600 mm shaft — 3600 kN basic dynamic capacity in a 218000 g, open ISO 15 envelope. Reading the full code: the number gives the 600×800 mm envelope, — names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and plain outer ring (no D1/W33 groove) completes the order number. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Pu 490 kN against C0 8000 kN anchors the contamination derating; for dirty mining duty the adjusted life of 239/600 moves with cleanliness far more than with small C variations. Fillet radii on shaft and housing must clear the ring chamfers of the 150 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 600 mm bore 239/600 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 450 r/min needs drain and level design; flooding the 150 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 600 mm bearing, and drive-up procedures differ.",
      "Oil relubrication toward 450 r/min needs drain and level design; flooding the 150 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 239/600 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 3600/8000 kN ratings, 490 kN Pu and 218000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/600 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/600?",
        "a": "239/600 is an NTN double-row spherical roller bearing to ISO 15: 600 mm bore, 800 mm OD and 150 mm width (23.622 × 31.496 × 5.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3600 kN, C0 8000 kN, Pu 490 kN, grease limiting speed 350 r/min, oil 450 r/min, mass about 218000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "239/600 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 239/600K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/600 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/600?",
        "a": "239/600 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/600 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3600 kN C / 8000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-600K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 239-600K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-600"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-600K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/600K",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 600,
    "D_mm": 800,
    "B_mm": 150,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 3600,
    "static_load_kN": 8000,
    "fatigue_load_limit_kN": 490,
    "limiting_speed_rpm": 350,
    "max_rpm": 350,
    "speed_oil_rpm": 450,
    "weight_g": 211000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 600 mm shaft, NTN supplies 239/600K: sphered outer raceway, two roller rows, pressed-steel cage (standard execution), oil speed 450 r/min. Digit by digit the code reads as spherical-roller dimension series plus 600 mm bore; the 150 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The 1:12 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 600 mm bore assembly. Selection: the C0/C ratio of 2.22 (8000/3600 kN) reflects the heavy static and shock proportioning of 239/600K; size the equivalent load at the required L10 with shock factor for the application. Mount 239/600K on its adapter or withdrawal sleeve on the 600 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 600 mm bore 239/600K is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 150 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 239/600K on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 350 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Do not confuse EA and EM at the same number: 239/600K carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 600×800 mm envelope is identical.",
      "The 3600/8000 kN ratings, 490 kN Pu and 211000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/600K (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/600K?",
        "a": "239/600K is an NTN double-row spherical roller bearing to ISO 15: 600 mm bore, 800 mm OD and 150 mm width (23.622 × 31.496 × 5.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3600 kN, C0 8000 kN, Pu 490 kN, grease limiting speed 350 r/min, oil 450 r/min, mass about 211000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 239/600K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 239/600."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/600K is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/600K?",
        "a": "239/600K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/600K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3600 kN C / 8000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-600",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 239-600 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-600k",
      "239-600K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "230-600B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 230/600B",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 600,
    "D_mm": 870,
    "B_mm": 200,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5800,
    "static_load_kN": 12000,
    "fatigue_load_limit_kN": 835,
    "limiting_speed_rpm": 310,
    "max_rpm": 310,
    "speed_oil_rpm": 420,
    "weight_g": 400000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 230/600B denotes the 600 mm bore spherical roller bearing (5800 kN C / 12000 kN C0) in the 23000 series, the self-aligning choice for heavy combined load. Reading the full code: the number gives the 600×870 mm envelope, — names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and plain outer ring (no D1/W33 groove) completes the order number. Pu 835 kN is the catalogue fatigue load limit for 230/600B, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Grease/oil ratio: the 310 r/min limiting value is .74 of the 420 r/min oil value; heavy 200 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 600 mm set.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 600 mm bore 230/600B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 5800 kN rating no longer applies.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 600 mm bearing, and drive-up procedures differ.",
      "The cylindrical-bore 230/600B and its tapered-bore counterpart 230/600BK share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 230/600B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 5800/12000 kN ratings, 835 kN Pu and 400000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 230/600B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 230/600B?",
        "a": "230/600B is an NTN double-row spherical roller bearing to ISO 15: 600 mm bore, 870 mm OD and 200 mm width (23.622 × 34.252 × 7.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5800 kN, C0 12000 kN, Pu 835 kN, grease limiting speed 310 r/min, oil 420 r/min, mass about 400000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "230/600B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 230/600BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 230/600B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 230/600B?",
        "a": "230/600B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 230/600B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5800 kN C / 12000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "230-600BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 230-600BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "230-600b",
      "230-600B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "230-600BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 230/600BK",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 600,
    "D_mm": 870,
    "B_mm": 200,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5800,
    "static_load_kN": 12000,
    "fatigue_load_limit_kN": 835,
    "limiting_speed_rpm": 310,
    "max_rpm": 310,
    "speed_oil_rpm": 420,
    "weight_g": 386000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "230/600BK is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 600×870×200 mm to ISO 15, with pressed-steel cage (standard execution). Numbering ties 230/600BK to its envelope and execution: same-number EA versus EM or plain variants share the 600 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Open by design, 230/600BK requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Pu 835 kN against C0 12000 kN anchors the contamination derating; for dirty mining duty the adjusted life of 230/600BK moves with cleanliness far more than with small C variations. Mount 230/600BK on its adapter or withdrawal sleeve on the 600 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 600 mm bore 230/600BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 230/600BK carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 600×870 mm envelope is identical.",
      "Never substitute 230/600BK by envelope alone: the 12000 kN C0 and 835 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 200 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 5800 kN rating no longer applies.",
      "The 5800/12000 kN ratings, 835 kN Pu and 386000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 230/600BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 230/600BK?",
        "a": "230/600BK is an NTN double-row spherical roller bearing to ISO 15: 600 mm bore, 870 mm OD and 200 mm width (23.622 × 34.252 × 7.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5800 kN, C0 12000 kN, Pu 835 kN, grease limiting speed 310 r/min, oil 420 r/min, mass about 386000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 230/600BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 230/600B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 230/600BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 230/600BK?",
        "a": "230/600BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 230/600BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5800 kN C / 12000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "230-600B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 230-600B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "230-600bk",
      "230-600BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "240-600B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 240/600B",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 600,
    "D_mm": 870,
    "B_mm": 272,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 7150,
    "static_load_kN": 15600,
    "fatigue_load_limit_kN": 750,
    "limiting_speed_rpm": 280,
    "max_rpm": 280,
    "speed_oil_rpm": 370,
    "weight_g": 544000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "240/600B is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 600×870×272 mm to ISO 15, with pressed-steel cage (standard execution). Numbering ties 240/600B to its envelope and execution: same-number EA versus EM or plain variants share the 600 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Suffix reading on 240/600B: the bare number is the standard open execution; B marks the standard large-bore internal design on slash-size 230–232 series; quote the full code because each suffix is a distinct article. The 135.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 272 mm-wide ring seats fully on both sides. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 600 mm bore 240/600B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 370 r/min needs drain and level design; flooding the 272 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The cylindrical-bore 240/600B and its tapered-bore counterpart 240/600BK30 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Do not confuse EA and EM at the same number: 240/600B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 600×870 mm envelope is identical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 272 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 7150/15600 kN ratings, 750 kN Pu and 544000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/600B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 240/600B?",
        "a": "240/600B is an NTN double-row spherical roller bearing to ISO 15: 600 mm bore, 870 mm OD and 272 mm width (23.622 × 34.252 × 10.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 7150 kN, C0 15600 kN, Pu 750 kN, grease limiting speed 280 r/min, oil 370 r/min, mass about 544000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "240/600B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 240/600BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 240/600B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 240/600B?",
        "a": "240/600B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 240/600B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 7150 kN C / 15600 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "240-600BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 240-600BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "240-600b",
      "240-600B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "240-600BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 240/600BK30",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 600,
    "D_mm": 870,
    "B_mm": 272,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 7150,
    "static_load_kN": 15600,
    "fatigue_load_limit_kN": 750,
    "limiting_speed_rpm": 280,
    "max_rpm": 280,
    "speed_oil_rpm": 370,
    "weight_g": 535000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "240/600BK30 is the basic execution of NTN's spherical roller range for a 600 mm shaft — 7150 kN basic dynamic capacity in a 535000 g, open ISO 15 envelope. Numbering ties 240/600BK30 to its envelope and execution: same-number EA versus EM or plain variants share the 600 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Open by design, 240/600BK30 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Speed planning: 280 r/min grease limiting speed is the cage/kinematic ceiling and 370 r/min is the oil-lubricated value for the 600 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Never mount 240/600BK30 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 870 mm race.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 600 mm bore 240/600BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 600 mm bearing, and drive-up procedures differ.",
      "Do not confuse EA and EM at the same number: 240/600BK30 carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 600×870 mm envelope is identical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 7150 kN rating no longer applies.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 7150 kN rating no longer applies.",
      "The 7150/15600 kN ratings, 750 kN Pu and 535000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/600BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 240/600BK30?",
        "a": "240/600BK30 is an NTN double-row spherical roller bearing to ISO 15: 600 mm bore, 870 mm OD and 272 mm width (23.622 × 34.252 × 10.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 7150 kN, C0 15600 kN, Pu 750 kN, grease limiting speed 280 r/min, oil 370 r/min, mass about 535000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 240/600BK30 mounts on a matching adapter or withdrawal sleeve on a plain 600 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 240/600B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 240/600BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 240/600BK30?",
        "a": "240/600BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 240/600BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 7150 kN C / 15600 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "240-600B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 240-600B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "240-600bk30",
      "240-600BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "231-600B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 231/600B",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 600,
    "D_mm": 980,
    "B_mm": 300,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 10000,
    "static_load_kN": 18400,
    "fatigue_load_limit_kN": 1160,
    "limiting_speed_rpm": 260,
    "max_rpm": 260,
    "speed_oil_rpm": 340,
    "weight_g": 908000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "231/600B belongs to the 23100 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. Numbering ties 231/600B to its envelope and execution: same-number EA versus EM or plain variants share the 600 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. 600 mm bore is 23.622 in and 980 mm OD is 38.583 in; the ISO 15 envelope swaps between brands, but the 10000/18400 kN ratings and cage design are NTN 2203E values. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 600 mm set.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 600 mm bore 231/600B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 231/600B by envelope alone: the 18400 kN C0 and 1160 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Oil relubrication toward 340 r/min needs drain and level design; flooding the 300 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 10000 kN rating no longer applies.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 600 mm bearing, and drive-up procedures differ.",
      "The 10000/18400 kN ratings, 1160 kN Pu and 908000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 231/600B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 231/600B?",
        "a": "231/600B is an NTN double-row spherical roller bearing to ISO 15: 600 mm bore, 980 mm OD and 300 mm width (23.622 × 38.583 × 11.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 10000 kN, C0 18400 kN, Pu 1160 kN, grease limiting speed 260 r/min, oil 340 r/min, mass about 908000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "231/600B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 231/600BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 231/600B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 231/600B?",
        "a": "231/600B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 231/600B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 10000 kN C / 18400 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "231-600BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 231-600BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "231-600b",
      "231-600B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "231-600BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 231/600BK",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 600,
    "D_mm": 980,
    "B_mm": 300,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 10000,
    "static_load_kN": 18400,
    "fatigue_load_limit_kN": 1160,
    "limiting_speed_rpm": 260,
    "max_rpm": 260,
    "speed_oil_rpm": 340,
    "weight_g": 880000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "231/600BK belongs to the 23100 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. Digit by digit the code reads as spherical-roller dimension series plus 600 mm bore; the 300 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Pu 1160 kN is the catalogue fatigue load limit for 231/600BK, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Catalogue mass 880000 g (880.00 kg) for the 600×980×300 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 600 mm bore 231/600BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 300 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 231/600BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 600 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 231/600BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 10000/18400 kN ratings, 1160 kN Pu and 880000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 231/600BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 231/600BK?",
        "a": "231/600BK is an NTN double-row spherical roller bearing to ISO 15: 600 mm bore, 980 mm OD and 300 mm width (23.622 × 38.583 × 11.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 10000 kN, C0 18400 kN, Pu 1160 kN, grease limiting speed 260 r/min, oil 340 r/min, mass about 880000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 231/600BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 231/600B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 231/600BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 231/600BK?",
        "a": "231/600BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 231/600BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 10000 kN C / 18400 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "231-600B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 231-600B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "231-600bk",
      "231-600BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "241-600B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 241/600B",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 600,
    "D_mm": 980,
    "B_mm": 375,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 11900,
    "static_load_kN": 23200,
    "fatigue_load_limit_kN": 1130,
    "limiting_speed_rpm": 260,
    "max_rpm": 260,
    "speed_oil_rpm": 340,
    "weight_g": 1130000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "241/600B is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 600×980×375 mm to ISO 15, with pressed-steel cage (standard execution). Digit by digit the code reads as spherical-roller dimension series plus 600 mm bore; the 375 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the basic cage. Grease/oil ratio: the 260 r/min limiting value is .76 of the 340 r/min oil value; heavy 375 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 241/600B leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 600 mm bore 241/600B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The cylindrical-bore 241/600B and its tapered-bore counterpart 241/600BK30 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Do not confuse EA and EM at the same number: 241/600B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 600×980 mm envelope is identical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 260 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Never substitute 241/600B by envelope alone: the 23200 kN C0 and 1130 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The 11900/23200 kN ratings, 1130 kN Pu and 1130000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 241/600B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 241/600B?",
        "a": "241/600B is an NTN double-row spherical roller bearing to ISO 15: 600 mm bore, 980 mm OD and 375 mm width (23.622 × 38.583 × 14.764 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 11900 kN, C0 23200 kN, Pu 1130 kN, grease limiting speed 260 r/min, oil 340 r/min, mass about 1130000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "241/600B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 241/600BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 241/600B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 241/600B?",
        "a": "241/600B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 241/600B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 11900 kN C / 23200 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "241-600BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 241-600BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "241-600b",
      "241-600B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "241-600BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 241/600BK30",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 600,
    "D_mm": 980,
    "B_mm": 375,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 11900,
    "static_load_kN": 23200,
    "fatigue_load_limit_kN": 1130,
    "limiting_speed_rpm": 260,
    "max_rpm": 260,
    "speed_oil_rpm": 340,
    "weight_g": 1110000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 241/600BK30 identifies a 600×980×375 mm (23.622 × 38.583 × 14.764 in) spherical roller bearing, 1:30 tapered bore (K30), to the ISO 15 boundary plan. Reading the full code: the number gives the 600×980 mm envelope, — names the cage/capacity execution, K30 marks the 1:30 tapered bore for sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. NTN prints two speeds for 241/600BK30: 260 r/min grease and 340 r/min oil — the gap of 80 r/min reflects oil cooling of the heavy roller set. Speed planning: 260 r/min grease limiting speed is the cage/kinematic ceiling and 340 r/min is the oil-lubricated value for the 600 mm bore; vibrating screens rarely approach either and are load/cage limited instead. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 241/600BK30 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 600 mm bore 241/600BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 241/600BK30 carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 600×980 mm envelope is identical.",
      "Do not confuse EA and EM at the same number: 241/600BK30 carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 600×980 mm envelope is identical.",
      "Never substitute 241/600BK30 by envelope alone: the 23200 kN C0 and 1130 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Oil relubrication toward 340 r/min needs drain and level design; flooding the 375 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 11900/23200 kN ratings, 1130 kN Pu and 1110000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 241/600BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 241/600BK30?",
        "a": "241/600BK30 is an NTN double-row spherical roller bearing to ISO 15: 600 mm bore, 980 mm OD and 375 mm width (23.622 × 38.583 × 14.764 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 11900 kN, C0 23200 kN, Pu 1130 kN, grease limiting speed 260 r/min, oil 340 r/min, mass about 1110000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 241/600BK30 mounts on a matching adapter or withdrawal sleeve on a plain 600 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 241/600B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 241/600BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 241/600BK30?",
        "a": "241/600BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 241/600BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 11900 kN C / 23200 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "241-600B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 241-600B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "241-600bk30",
      "241-600BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "232-600B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 232/600B",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 600,
    "D_mm": 1090,
    "B_mm": 388,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 13600,
    "static_load_kN": 23700,
    "fatigue_load_limit_kN": 930,
    "limiting_speed_rpm": 250,
    "max_rpm": 250,
    "speed_oil_rpm": 320,
    "weight_g": 1540000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "232/600B belongs to the 23200 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. Reading the full code: the number gives the 600×1090 mm envelope, — names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and plain outer ring (no D1/W33 groove) completes the order number. The 245.0 mm radial section over the 600 mm bore carries two roller rows; capacity per millimetre of bore is about 22.7 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. 600 mm bore is 23.622 in and 1090 mm OD is 42.913 in; the ISO 15 envelope swaps between brands, but the 13600/23700 kN ratings and cage design are NTN 2203E values. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 600 mm bore 232/600B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The cylindrical-bore 232/600B and its tapered-bore counterpart 232/600BK share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The cylindrical-bore 232/600B and its tapered-bore counterpart 232/600BK share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 600 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The cylindrical-bore 232/600B and its tapered-bore counterpart 232/600BK share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 13600/23700 kN ratings, 930 kN Pu and 1540000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 232/600B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 232/600B?",
        "a": "232/600B is an NTN double-row spherical roller bearing to ISO 15: 600 mm bore, 1090 mm OD and 388 mm width (23.622 × 42.913 × 15.276 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 13600 kN, C0 23700 kN, Pu 930 kN, grease limiting speed 250 r/min, oil 320 r/min, mass about 1540000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "232/600B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 232/600BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 232/600B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 232/600B?",
        "a": "232/600B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 232/600B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 13600 kN C / 23700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "232-600BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 232-600BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "232-600b",
      "232-600B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "232-600BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 232/600BK",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 600,
    "D_mm": 1090,
    "B_mm": 388,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 13600,
    "static_load_kN": 23700,
    "fatigue_load_limit_kN": 930,
    "limiting_speed_rpm": 250,
    "max_rpm": 250,
    "speed_oil_rpm": 320,
    "weight_g": 1490000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "232/600BK is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 600×1090×388 mm to ISO 15, with pressed-steel cage (standard execution). Numbering ties 232/600BK to its envelope and execution: same-number EA versus EM or plain variants share the 600 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The 245.0 mm radial section over the 600 mm bore carries two roller rows; capacity per millimetre of bore is about 22.7 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Equivalent-load planning keeps a radial plus moderate axial combination on 232/600BK; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 600 mm bore 232/600BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 388 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 232/600BK by envelope alone: the 23700 kN C0 and 930 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Oil relubrication toward 320 r/min needs drain and level design; flooding the 388 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 232/600B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 13600/23700 kN ratings, 930 kN Pu and 1490000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 232/600BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 232/600BK?",
        "a": "232/600BK is an NTN double-row spherical roller bearing to ISO 15: 600 mm bore, 1090 mm OD and 388 mm width (23.622 × 42.913 × 15.276 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 13600 kN, C0 23700 kN, Pu 930 kN, grease limiting speed 250 r/min, oil 320 r/min, mass about 1490000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 232/600BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 232/600B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 232/600BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 232/600BK?",
        "a": "232/600BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 232/600BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 13600 kN C / 23700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "232-600B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 232-600B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "232-600bk",
      "232-600BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-630",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/630",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 630,
    "D_mm": 850,
    "B_mm": 165,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4100,
    "static_load_kN": 9250,
    "fatigue_load_limit_kN": 545,
    "limiting_speed_rpm": 320,
    "max_rpm": 320,
    "speed_oil_rpm": 420,
    "weight_g": 277000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 239/630 identifies a 630×850×165 mm (24.803 × 33.465 × 6.496 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Numbering ties 239/630 to its envelope and execution: same-number EA versus EM or plain variants share the 630 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. At 4100 kN C and 277000 g mass the 23900 series part is built for shock and vibration; the 165 mm-wide ring needs square abutments to keep both rows equally loaded. Catalogue mass 277000 g (277.00 kg) for the 630×850×165 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 630 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 630 mm bore 239/630 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 165 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 165 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 165 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 320 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 4100/9250 kN ratings, 545 kN Pu and 277000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/630 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/630?",
        "a": "239/630 is an NTN double-row spherical roller bearing to ISO 15: 630 mm bore, 850 mm OD and 165 mm width (24.803 × 33.465 × 6.496 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4100 kN, C0 9250 kN, Pu 545 kN, grease limiting speed 320 r/min, oil 420 r/min, mass about 277000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "239/630 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 239/630K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/630 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/630?",
        "a": "239/630 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/630 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4100 kN C / 9250 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-630K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 239-630K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-630"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-630K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/630K",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 630,
    "D_mm": 850,
    "B_mm": 165,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4100,
    "static_load_kN": 9250,
    "fatigue_load_limit_kN": 545,
    "limiting_speed_rpm": 320,
    "max_rpm": 320,
    "speed_oil_rpm": 420,
    "weight_g": 268000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "239/630K is the basic execution of NTN's spherical roller range for a 630 mm shaft — 4100 kN basic dynamic capacity in a 268000 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 630 mm bore; the 165 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. NTN prints two speeds for 239/630K: 320 r/min grease and 420 r/min oil — the gap of 100 r/min reflects oil cooling of the heavy roller set. The 110.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 165 mm-wide ring seats fully on both sides. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 239/630K leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 630 mm bore 239/630K is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 420 r/min needs drain and level design; flooding the 165 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 630 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 239/630: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Oil relubrication toward 420 r/min needs drain and level design; flooding the 165 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 4100/9250 kN ratings, 545 kN Pu and 268000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/630K (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/630K?",
        "a": "239/630K is an NTN double-row spherical roller bearing to ISO 15: 630 mm bore, 850 mm OD and 165 mm width (24.803 × 33.465 × 6.496 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4100 kN, C0 9250 kN, Pu 545 kN, grease limiting speed 320 r/min, oil 420 r/min, mass about 268000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 239/630K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 239/630."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/630K is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/630K?",
        "a": "239/630K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/630K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4100 kN C / 9250 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-630",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 239-630 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-630k",
      "239-630K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "230-630B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 230/630B",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 630,
    "D_mm": 920,
    "B_mm": 212,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 6550,
    "static_load_kN": 13000,
    "fatigue_load_limit_kN": 950,
    "limiting_speed_rpm": 310,
    "max_rpm": 310,
    "speed_oil_rpm": 400,
    "weight_g": 481000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "230/630B is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 630×920×212 mm to ISO 15, with pressed-steel cage (standard execution). Reading the full code: the number gives the 630×920 mm envelope, — names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and plain outer ring (no D1/W33 groove) completes the order number. At 6550 kN C and 481000 g mass the 23000 series part is built for shock and vibration; the 212 mm-wide ring needs square abutments to keep both rows equally loaded. Grease/oil ratio: the 310 r/min limiting value is .78 of the 400 r/min oil value; heavy 212 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 230/630B leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 630 mm bore 230/630B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 212 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 230/630B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 6550 kN rating no longer applies.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 310 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 6550/13000 kN ratings, 950 kN Pu and 481000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 230/630B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 230/630B?",
        "a": "230/630B is an NTN double-row spherical roller bearing to ISO 15: 630 mm bore, 920 mm OD and 212 mm width (24.803 × 36.22 × 8.346 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 6550 kN, C0 13000 kN, Pu 950 kN, grease limiting speed 310 r/min, oil 400 r/min, mass about 481000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "230/630B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 230/630BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 230/630B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 230/630B?",
        "a": "230/630B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 230/630B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 6550 kN C / 13000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "230-630BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 230-630BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "230-630b",
      "230-630B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "230-630BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 230/630BK",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 630,
    "D_mm": 920,
    "B_mm": 212,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 6550,
    "static_load_kN": 13000,
    "fatigue_load_limit_kN": 950,
    "limiting_speed_rpm": 310,
    "max_rpm": 310,
    "speed_oil_rpm": 400,
    "weight_g": 464000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 230/630BK denotes the 630 mm bore spherical roller bearing (6550 kN C / 13000 kN C0) in the 23000 series, the self-aligning choice for heavy combined load. Digit by digit the code reads as spherical-roller dimension series plus 630 mm bore; the 212 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Suffix reading on 230/630BK: the bare number is the standard open execution; K marks the 1:12 tapered bore; B marks the standard large-bore internal design on slash-size 230–232 series; quote the full code because each suffix is a distinct article. Selection: the C0/C ratio of 1.98 (13000/6550 kN) reflects the heavy static and shock proportioning of 230/630BK; size the equivalent load at the required L10 with shock factor for the application. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 230/630BK leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 630 mm bore 230/630BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 6550 kN rating no longer applies.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 310 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 230/630B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 212 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 6550/13000 kN ratings, 950 kN Pu and 464000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 230/630BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 230/630BK?",
        "a": "230/630BK is an NTN double-row spherical roller bearing to ISO 15: 630 mm bore, 920 mm OD and 212 mm width (24.803 × 36.22 × 8.346 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 6550 kN, C0 13000 kN, Pu 950 kN, grease limiting speed 310 r/min, oil 400 r/min, mass about 464000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 230/630BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 230/630B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 230/630BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 230/630BK?",
        "a": "230/630BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 230/630BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 6550 kN C / 13000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "230-630B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 230-630B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "230-630bk",
      "230-630BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "240-630B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 240/630B",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 630,
    "D_mm": 920,
    "B_mm": 290,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 8400,
    "static_load_kN": 17900,
    "fatigue_load_limit_kN": 915,
    "limiting_speed_rpm": 270,
    "max_rpm": 270,
    "speed_oil_rpm": 350,
    "weight_g": 657000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 240/630B denotes the 630 mm bore spherical roller bearing (8400 kN C / 17900 kN C0) in the 24000 series, the self-aligning choice for heavy combined load. Numbering ties 240/630B to its envelope and execution: same-number EA versus EM or plain variants share the 630 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Pu 915 kN is the catalogue fatigue load limit for 240/630B, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. The 145.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 290 mm-wide ring seats fully on both sides. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 240/630B leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 630 mm bore 240/630B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 630 mm bearing, and drive-up procedures differ.",
      "Never substitute 240/630B by envelope alone: the 17900 kN C0 and 915 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Never substitute 240/630B by envelope alone: the 17900 kN C0 and 915 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 240/630B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 8400/17900 kN ratings, 915 kN Pu and 657000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/630B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 240/630B?",
        "a": "240/630B is an NTN double-row spherical roller bearing to ISO 15: 630 mm bore, 920 mm OD and 290 mm width (24.803 × 36.22 × 11.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 8400 kN, C0 17900 kN, Pu 915 kN, grease limiting speed 270 r/min, oil 350 r/min, mass about 657000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "240/630B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 240/630BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 240/630B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 240/630B?",
        "a": "240/630B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 240/630B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 8400 kN C / 17900 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "240-630BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 240-630BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "240-630b",
      "240-630B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "240-630BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 240/630BK30",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 630,
    "D_mm": 920,
    "B_mm": 290,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 8400,
    "static_load_kN": 17900,
    "fatigue_load_limit_kN": 915,
    "limiting_speed_rpm": 270,
    "max_rpm": 270,
    "speed_oil_rpm": 350,
    "weight_g": 646000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 240/630BK30 denotes the 630 mm bore spherical roller bearing (8400 kN C / 17900 kN C0) in the 24000 series, the self-aligning choice for heavy combined load. Reading the full code: the number gives the 630×920 mm envelope, — names the cage/capacity execution, K30 marks the 1:30 tapered bore for sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. NTN prints two speeds for 240/630BK30: 270 r/min grease and 350 r/min oil — the gap of 80 r/min reflects oil cooling of the heavy roller set. Selection: the C0/C ratio of 2.13 (17900/8400 kN) reflects the heavy static and shock proportioning of 240/630BK30; size the equivalent load at the required L10 with shock factor for the application. Mount 240/630BK30 on its adapter or withdrawal sleeve on the 630 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 630 mm bore 240/630BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 8400 kN rating no longer applies.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 240/630B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 290 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Oil relubrication toward 350 r/min needs drain and level design; flooding the 290 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 8400/17900 kN ratings, 915 kN Pu and 646000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/630BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 240/630BK30?",
        "a": "240/630BK30 is an NTN double-row spherical roller bearing to ISO 15: 630 mm bore, 920 mm OD and 290 mm width (24.803 × 36.22 × 11.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 8400 kN, C0 17900 kN, Pu 915 kN, grease limiting speed 270 r/min, oil 350 r/min, mass about 646000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 240/630BK30 mounts on a matching adapter or withdrawal sleeve on a plain 630 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 240/630B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 240/630BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 240/630BK30?",
        "a": "240/630BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 240/630BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 8400 kN C / 17900 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "240-630B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 240-630B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "240-630bk30",
      "240-630BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "231-630B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 231/630B",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 630,
    "D_mm": 1030,
    "B_mm": 315,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 10700,
    "static_load_kN": 19900,
    "fatigue_load_limit_kN": 1190,
    "limiting_speed_rpm": 250,
    "max_rpm": 250,
    "speed_oil_rpm": 320,
    "weight_g": 1050000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "231/630B is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 630×1030×315 mm to ISO 15, with pressed-steel cage (standard execution). Numbering ties 231/630B to its envelope and execution: same-number EA versus EM or plain variants share the 630 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Open by design, 231/630B requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. With about 17.0 kN of C per millimetre of the 630 mm bore, 231/630B screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Never mount 231/630B by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 1030 mm race.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 630 mm bore 231/630B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 231/630B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 10700 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 630 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 10700 kN rating no longer applies.",
      "The 10700/19900 kN ratings, 1190 kN Pu and 1050000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 231/630B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 231/630B?",
        "a": "231/630B is an NTN double-row spherical roller bearing to ISO 15: 630 mm bore, 1030 mm OD and 315 mm width (24.803 × 40.551 × 12.402 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 10700 kN, C0 19900 kN, Pu 1190 kN, grease limiting speed 250 r/min, oil 320 r/min, mass about 1050000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "231/630B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 231/630BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 231/630B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 231/630B?",
        "a": "231/630B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 231/630B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 10700 kN C / 19900 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "231-630BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 231-630BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "231-630b",
      "231-630B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "231-630BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 231/630BK",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 630,
    "D_mm": 1030,
    "B_mm": 315,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 10700,
    "static_load_kN": 19900,
    "fatigue_load_limit_kN": 1190,
    "limiting_speed_rpm": 250,
    "max_rpm": 250,
    "speed_oil_rpm": 320,
    "weight_g": 1020000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "231/630BK is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 630×1030×315 mm to ISO 15, with pressed-steel cage (standard execution). On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (K), lubrication feature (none); 231/630BK is assembled exactly in that order. The 200.0 mm radial section over the 630 mm bore carries two roller rows; capacity per millimetre of bore is about 17.0 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Pu 1190 kN against C0 19900 kN anchors the contamination derating; for dirty mining duty the adjusted life of 231/630BK moves with cleanliness far more than with small C variations. Never mount 231/630BK by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 1030 mm race.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 630 mm bore 231/630BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 320 r/min needs drain and level design; flooding the 315 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 10700 kN rating no longer applies.",
      "Do not confuse EA and EM at the same number: 231/630BK carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 630×1030 mm envelope is identical.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 231/630B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 10700/19900 kN ratings, 1190 kN Pu and 1020000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 231/630BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 231/630BK?",
        "a": "231/630BK is an NTN double-row spherical roller bearing to ISO 15: 630 mm bore, 1030 mm OD and 315 mm width (24.803 × 40.551 × 12.402 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 10700 kN, C0 19900 kN, Pu 1190 kN, grease limiting speed 250 r/min, oil 320 r/min, mass about 1020000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 231/630BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 231/630B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 231/630BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 231/630BK?",
        "a": "231/630BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 231/630BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 10700 kN C / 19900 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "231-630B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 231-630B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "231-630bk",
      "231-630BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "241-630B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 241/630B",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 630,
    "D_mm": 1030,
    "B_mm": 400,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 12900,
    "static_load_kN": 25000,
    "fatigue_load_limit_kN": 1200,
    "limiting_speed_rpm": 250,
    "max_rpm": 250,
    "speed_oil_rpm": 320,
    "weight_g": 1330000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "241/630B belongs to the 24100 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. Digit by digit the code reads as spherical-roller dimension series plus 630 mm bore; the 400 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Grease/oil ratio: the 250 r/min limiting value is .78 of the 320 r/min oil value; heavy 400 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Fillet radii on shaft and housing must clear the ring chamfers of the 400 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 630 mm bore 241/630B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 241/630B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 630 mm bearing, and drive-up procedures differ.",
      "Oil relubrication toward 320 r/min needs drain and level design; flooding the 400 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 241/630B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 12900/25000 kN ratings, 1200 kN Pu and 1330000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 241/630B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 241/630B?",
        "a": "241/630B is an NTN double-row spherical roller bearing to ISO 15: 630 mm bore, 1030 mm OD and 400 mm width (24.803 × 40.551 × 15.748 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 12900 kN, C0 25000 kN, Pu 1200 kN, grease limiting speed 250 r/min, oil 320 r/min, mass about 1330000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "241/630B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 241/630BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 241/630B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 241/630B?",
        "a": "241/630B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 241/630B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 12900 kN C / 25000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "241-630BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 241-630BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "241-630b",
      "241-630B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "241-630BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 241/630BK30",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 630,
    "D_mm": 1030,
    "B_mm": 400,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 12900,
    "static_load_kN": 25000,
    "fatigue_load_limit_kN": 1200,
    "limiting_speed_rpm": 250,
    "max_rpm": 250,
    "speed_oil_rpm": 320,
    "weight_g": 1310000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "241/630BK30 is the basic execution of NTN's spherical roller range for a 630 mm shaft — 12900 kN basic dynamic capacity in a 1310000 g, open ISO 15 envelope. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 630 mm (two-digit code ×5, with the 00–03 exception table), and 1030 mm OD / 400 mm width follow the general plan. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the basic cage. Selection: the C0/C ratio of 1.94 (25000/12900 kN) reflects the heavy static and shock proportioning of 241/630BK30; size the equivalent load at the required L10 with shock factor for the application. Fillet radii on shaft and housing must clear the ring chamfers of the 400 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 630 mm bore 241/630BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 241/630BK30 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 241/630B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 241/630BK30 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Never substitute 241/630BK30 by envelope alone: the 25000 kN C0 and 1200 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The 12900/25000 kN ratings, 1200 kN Pu and 1310000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 241/630BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 241/630BK30?",
        "a": "241/630BK30 is an NTN double-row spherical roller bearing to ISO 15: 630 mm bore, 1030 mm OD and 400 mm width (24.803 × 40.551 × 15.748 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 12900 kN, C0 25000 kN, Pu 1200 kN, grease limiting speed 250 r/min, oil 320 r/min, mass about 1310000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 241/630BK30 mounts on a matching adapter or withdrawal sleeve on a plain 630 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 241/630B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 241/630BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 241/630BK30?",
        "a": "241/630BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 241/630BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 12900 kN C / 25000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "241-630B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 241-630B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "241-630bk30",
      "241-630BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "232-630B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 232/630B",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 630,
    "D_mm": 1150,
    "B_mm": 412,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 15200,
    "static_load_kN": 26800,
    "fatigue_load_limit_kN": 1540,
    "limiting_speed_rpm": 230,
    "max_rpm": 230,
    "speed_oil_rpm": 300,
    "weight_g": 1900000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 232/630B identifies a 630×1150×412 mm (24.803 × 45.276 × 16.22 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Reading the full code: the number gives the 630×1150 mm envelope, — names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and plain outer ring (no D1/W33 groove) completes the order number. Pu 1540 kN is the catalogue fatigue load limit for 232/630B, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. 630 mm bore is 24.803 in and 1150 mm OD is 45.276 in; the ISO 15 envelope swaps between brands, but the 15200/26800 kN ratings and cage design are NTN 2203E values. Never mount 232/630B by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 1150 mm race.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 630 mm bore 232/630B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 232/630B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Do not confuse EA and EM at the same number: 232/630B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 630×1150 mm envelope is identical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 630 mm bearing, and drive-up procedures differ.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 232/630B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 15200/26800 kN ratings, 1540 kN Pu and 1900000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 232/630B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 232/630B?",
        "a": "232/630B is an NTN double-row spherical roller bearing to ISO 15: 630 mm bore, 1150 mm OD and 412 mm width (24.803 × 45.276 × 16.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 15200 kN, C0 26800 kN, Pu 1540 kN, grease limiting speed 230 r/min, oil 300 r/min, mass about 1900000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "232/630B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 232/630BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 232/630B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 232/630B?",
        "a": "232/630B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 232/630B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 15200 kN C / 26800 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "232-630BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 232-630BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "232-630b",
      "232-630B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "232-630BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 232/630BK",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 630,
    "D_mm": 1150,
    "B_mm": 412,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 15200,
    "static_load_kN": 26800,
    "fatigue_load_limit_kN": 1540,
    "limiting_speed_rpm": 230,
    "max_rpm": 230,
    "speed_oil_rpm": 300,
    "weight_g": 1840000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 232/630BK denotes the 630 mm bore spherical roller bearing (15200 kN C / 26800 kN C0) in the 23200 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (23200 series); the bore code resolves to 630 mm (two-digit code ×5, with the 00–03 exception table), and 1150 mm OD / 412 mm width follow the general plan. Pu 1540 kN is the catalogue fatigue load limit for 232/630BK, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Catalogue mass 1840000 g (1840.00 kg) for the 630×1150×412 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Mount 232/630BK on its adapter or withdrawal sleeve on the 630 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 630 mm bore 232/630BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 232/630BK by envelope alone: the 26800 kN C0 and 1540 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 230 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 232/630BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 232/630BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 15200/26800 kN ratings, 1540 kN Pu and 1840000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 232/630BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 232/630BK?",
        "a": "232/630BK is an NTN double-row spherical roller bearing to ISO 15: 630 mm bore, 1150 mm OD and 412 mm width (24.803 × 45.276 × 16.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 15200 kN, C0 26800 kN, Pu 1540 kN, grease limiting speed 230 r/min, oil 300 r/min, mass about 1840000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 232/630BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 232/630B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 232/630BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 232/630BK?",
        "a": "232/630BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 232/630BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 15200 kN C / 26800 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "232-630B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 232-630B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "232-630bk",
      "232-630BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-670",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/670",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 670,
    "D_mm": 900,
    "B_mm": 170,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4550,
    "static_load_kN": 10300,
    "fatigue_load_limit_kN": 795,
    "limiting_speed_rpm": 300,
    "max_rpm": 300,
    "speed_oil_rpm": 390,
    "weight_g": 317000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "239/670 is the basic execution of NTN's spherical roller range for a 670 mm shaft — 4550 kN basic dynamic capacity in a 317000 g, open ISO 15 envelope. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (cylindrical), lubrication feature (none); 239/670 is assembled exactly in that order. Suffix reading on 239/670: the bare number is the standard open execution; quote the full code because each suffix is a distinct article. Equivalent-load planning keeps a radial plus moderate axial combination on 239/670; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Fillet radii on shaft and housing must clear the ring chamfers of the 170 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 670 mm bore 239/670 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 300 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Oil relubrication toward 390 r/min needs drain and level design; flooding the 170 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 239/670 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 170 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 4550/10300 kN ratings, 795 kN Pu and 317000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/670 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/670?",
        "a": "239/670 is an NTN double-row spherical roller bearing to ISO 15: 670 mm bore, 900 mm OD and 170 mm width (26.378 × 35.433 × 6.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4550 kN, C0 10300 kN, Pu 795 kN, grease limiting speed 300 r/min, oil 390 r/min, mass about 317000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "239/670 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 239/670K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/670 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/670?",
        "a": "239/670 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/670 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4550 kN C / 10300 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-670K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 239-670K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-670"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-670K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/670K",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 670,
    "D_mm": 900,
    "B_mm": 170,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4550,
    "static_load_kN": 10300,
    "fatigue_load_limit_kN": 795,
    "limiting_speed_rpm": 300,
    "max_rpm": 300,
    "speed_oil_rpm": 390,
    "weight_g": 307000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "239/670K belongs to the 23900 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (K), lubrication feature (none); 239/670K is assembled exactly in that order. The 115.0 mm radial section over the 670 mm bore carries two roller rows; capacity per millimetre of bore is about 6.8 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Pu 795 kN against C0 10300 kN anchors the contamination derating; for dirty mining duty the adjusted life of 239/670K moves with cleanliness far more than with small C variations. Mount 239/670K on its adapter or withdrawal sleeve on the 670 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 670 mm bore 239/670K is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 239/670K carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 670×900 mm envelope is identical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 170 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 300 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 239/670: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 4550/10300 kN ratings, 795 kN Pu and 307000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/670K (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/670K?",
        "a": "239/670K is an NTN double-row spherical roller bearing to ISO 15: 670 mm bore, 900 mm OD and 170 mm width (26.378 × 35.433 × 6.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4550 kN, C0 10300 kN, Pu 795 kN, grease limiting speed 300 r/min, oil 390 r/min, mass about 307000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 239/670K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 239/670."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/670K is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/670K?",
        "a": "239/670K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/670K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4550 kN C / 10300 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-670",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 239-670 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-670k",
      "239-670K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "230-670B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 230/670B",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 670,
    "D_mm": 980,
    "B_mm": 230,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 7300,
    "static_load_kN": 14600,
    "fatigue_load_limit_kN": 1000,
    "limiting_speed_rpm": 280,
    "max_rpm": 280,
    "speed_oil_rpm": 360,
    "weight_g": 594000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "230/670B is the basic execution of NTN's spherical roller range for a 670 mm shaft — 7300 kN basic dynamic capacity in a 594000 g, open ISO 15 envelope. Numbering ties 230/670B to its envelope and execution: same-number EA versus EM or plain variants share the 670 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Suffix reading on 230/670B: the bare number is the standard open execution; B marks the standard large-bore internal design on slash-size 230–232 series; quote the full code because each suffix is a distinct article. Selection: the C0/C ratio of 2.00 (14600/7300 kN) reflects the heavy static and shock proportioning of 230/670B; size the equivalent load at the required L10 with shock factor for the application. Fit the cylindrical-bore 230/670B with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 670 mm bore 230/670B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 670 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Do not confuse EA and EM at the same number: 230/670B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 670×980 mm envelope is identical.",
      "Oil relubrication toward 360 r/min needs drain and level design; flooding the 230 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 230 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 7300/14600 kN ratings, 1000 kN Pu and 594000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 230/670B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 230/670B?",
        "a": "230/670B is an NTN double-row spherical roller bearing to ISO 15: 670 mm bore, 980 mm OD and 230 mm width (26.378 × 38.583 × 9.055 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 7300 kN, C0 14600 kN, Pu 1000 kN, grease limiting speed 280 r/min, oil 360 r/min, mass about 594000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "230/670B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 230/670BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 230/670B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 230/670B?",
        "a": "230/670B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 230/670B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 7300 kN C / 14600 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "230-670BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 230-670BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "230-670b",
      "230-670B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "230-670BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 230/670BK",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 670,
    "D_mm": 980,
    "B_mm": 230,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 7300,
    "static_load_kN": 14600,
    "fatigue_load_limit_kN": 1000,
    "limiting_speed_rpm": 280,
    "max_rpm": 280,
    "speed_oil_rpm": 360,
    "weight_g": 573000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "230/670BK is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 670×980×230 mm to ISO 15, with pressed-steel cage (standard execution). Reading the full code: the number gives the 670×980 mm envelope, — names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Selection: the C0/C ratio of 2.00 (14600/7300 kN) reflects the heavy static and shock proportioning of 230/670BK; size the equivalent load at the required L10 with shock factor for the application. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 670 mm bore 230/670BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 230/670BK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 230/670B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 670 mm bearing, and drive-up procedures differ.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 670 mm bearing, and drive-up procedures differ.",
      "The 7300/14600 kN ratings, 1000 kN Pu and 573000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 230/670BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 230/670BK?",
        "a": "230/670BK is an NTN double-row spherical roller bearing to ISO 15: 670 mm bore, 980 mm OD and 230 mm width (26.378 × 38.583 × 9.055 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 7300 kN, C0 14600 kN, Pu 1000 kN, grease limiting speed 280 r/min, oil 360 r/min, mass about 573000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 230/670BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 230/670B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 230/670BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 230/670BK?",
        "a": "230/670BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 230/670BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 7300 kN C / 14600 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "230-670B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 230-670B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "230-670bk",
      "230-670BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "240-670B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 240/670B",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 670,
    "D_mm": 980,
    "B_mm": 308,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 9650,
    "static_load_kN": 20600,
    "fatigue_load_limit_kN": 1040,
    "limiting_speed_rpm": 250,
    "max_rpm": 250,
    "speed_oil_rpm": 320,
    "weight_g": 794000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 240/670B with a cylindrical bore and plain outer ring (no D1/W33 groove): 670 mm bore, 980 mm OD, 308 mm width, rated 250 r/min on grease. Digit by digit the code reads as spherical-roller dimension series plus 670 mm bore; the 308 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The 155.0 mm radial section over the 670 mm bore carries two roller rows; capacity per millimetre of bore is about 14.4 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Pu 1040 kN against C0 20600 kN anchors the contamination derating; for dirty mining duty the adjusted life of 240/670B moves with cleanliness far more than with small C variations. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 670 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 670 mm bore 240/670B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 9650 kN rating no longer applies.",
      "Oil relubrication toward 320 r/min needs drain and level design; flooding the 308 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The cylindrical-bore 240/670B and its tapered-bore counterpart 240/670BK30 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The cylindrical-bore 240/670B and its tapered-bore counterpart 240/670BK30 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 9650/20600 kN ratings, 1040 kN Pu and 794000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/670B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 240/670B?",
        "a": "240/670B is an NTN double-row spherical roller bearing to ISO 15: 670 mm bore, 980 mm OD and 308 mm width (26.378 × 38.583 × 12.126 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 9650 kN, C0 20600 kN, Pu 1040 kN, grease limiting speed 250 r/min, oil 320 r/min, mass about 794000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "240/670B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 240/670BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 240/670B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 240/670B?",
        "a": "240/670B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 240/670B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 9650 kN C / 20600 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "240-670BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 240-670BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "240-670b",
      "240-670B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "240-670BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 240/670BK30",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 670,
    "D_mm": 980,
    "B_mm": 308,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 9650,
    "static_load_kN": 20600,
    "fatigue_load_limit_kN": 1040,
    "limiting_speed_rpm": 250,
    "max_rpm": 250,
    "speed_oil_rpm": 320,
    "weight_g": 781000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "240/670BK30 belongs to the 24000 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. Reading the full code: the number gives the 670×980 mm envelope, — names the cage/capacity execution, K30 marks the 1:30 tapered bore for sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. Pu 1040 kN is the catalogue fatigue load limit for 240/670BK30, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Grease/oil ratio: the 250 r/min limiting value is .78 of the 320 r/min oil value; heavy 308 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 670 mm bore 240/670BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 308 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 240/670B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 9650 kN rating no longer applies.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 240/670BK30 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 9650/20600 kN ratings, 1040 kN Pu and 781000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/670BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 240/670BK30?",
        "a": "240/670BK30 is an NTN double-row spherical roller bearing to ISO 15: 670 mm bore, 980 mm OD and 308 mm width (26.378 × 38.583 × 12.126 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 9650 kN, C0 20600 kN, Pu 1040 kN, grease limiting speed 250 r/min, oil 320 r/min, mass about 781000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 240/670BK30 mounts on a matching adapter or withdrawal sleeve on a plain 670 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 240/670B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 240/670BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 240/670BK30?",
        "a": "240/670BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 240/670BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 9650 kN C / 20600 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "240-670B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 240-670B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "240-670bk30",
      "240-670BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "231-670B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 231/670B",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 670,
    "D_mm": 1090,
    "B_mm": 336,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 12500,
    "static_load_kN": 23600,
    "fatigue_load_limit_kN": 1400,
    "limiting_speed_rpm": 230,
    "max_rpm": 230,
    "speed_oil_rpm": 300,
    "weight_g": 1250000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 231/670B denotes the 670 mm bore spherical roller bearing (12500 kN C / 23600 kN C0) in the 23100 series, the self-aligning choice for heavy combined load. Digit by digit the code reads as spherical-roller dimension series plus 670 mm bore; the 336 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The cylindrical bore fits a machined 670 mm shaft seat directly; the same envelope in 231/670BK (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Equivalent-load planning keeps a radial plus moderate axial combination on 231/670B; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 670 mm set.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 670 mm bore 231/670B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 300 r/min needs drain and level design; flooding the 336 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 670 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 12500 kN rating no longer applies.",
      "Do not confuse EA and EM at the same number: 231/670B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 670×1090 mm envelope is identical.",
      "The 12500/23600 kN ratings, 1400 kN Pu and 1250000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 231/670B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 231/670B?",
        "a": "231/670B is an NTN double-row spherical roller bearing to ISO 15: 670 mm bore, 1090 mm OD and 336 mm width (26.378 × 42.913 × 13.228 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 12500 kN, C0 23600 kN, Pu 1400 kN, grease limiting speed 230 r/min, oil 300 r/min, mass about 1250000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "231/670B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 231/670BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 231/670B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 231/670B?",
        "a": "231/670B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 231/670B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 12500 kN C / 23600 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "231-670BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 231-670BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "231-670b",
      "231-670B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "231-670BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 231/670BK",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 670,
    "D_mm": 1090,
    "B_mm": 336,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 12500,
    "static_load_kN": 23600,
    "fatigue_load_limit_kN": 1400,
    "limiting_speed_rpm": 230,
    "max_rpm": 230,
    "speed_oil_rpm": 300,
    "weight_g": 1210000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "231/670BK belongs to the 23100 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. Numbering ties 231/670BK to its envelope and execution: same-number EA versus EM or plain variants share the 670 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. At 12500 kN C and 1210000 g mass the 23100 series part is built for shock and vibration; the 336 mm-wide ring needs square abutments to keep both rows equally loaded. Pu 1400 kN against C0 23600 kN anchors the contamination derating; for dirty mining duty the adjusted life of 231/670BK moves with cleanliness far more than with small C variations. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 231/670BK leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 670 mm bore 231/670BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 231/670BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 670 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 231/670BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 230 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 12500/23600 kN ratings, 1400 kN Pu and 1210000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 231/670BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 231/670BK?",
        "a": "231/670BK is an NTN double-row spherical roller bearing to ISO 15: 670 mm bore, 1090 mm OD and 336 mm width (26.378 × 42.913 × 13.228 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 12500 kN, C0 23600 kN, Pu 1400 kN, grease limiting speed 230 r/min, oil 300 r/min, mass about 1210000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 231/670BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 231/670B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 231/670BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 231/670BK?",
        "a": "231/670BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 231/670BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 12500 kN C / 23600 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "231-670B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 231-670B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "231-670bk",
      "231-670BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "241-670B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 241/670B",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 670,
    "D_mm": 1090,
    "B_mm": 412,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 14100,
    "static_load_kN": 28000,
    "fatigue_load_limit_kN": 1340,
    "limiting_speed_rpm": 230,
    "max_rpm": 230,
    "speed_oil_rpm": 300,
    "weight_g": 1530000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 241/670B with a cylindrical bore and plain outer ring (no D1/W33 groove): 670 mm bore, 1090 mm OD, 412 mm width, rated 230 r/min on grease. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (cylindrical), lubrication feature (none); 241/670B is assembled exactly in that order. Two symmetric roller rows share the load: C 14100 kN, C0 28000 kN (C0/C ≈ 1.99), with useful axial capacity in either direction alongside the dominant radial load. Selection: the C0/C ratio of 1.99 (28000/14100 kN) reflects the heavy static and shock proportioning of 241/670B; size the equivalent load at the required L10 with shock factor for the application. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 670 mm set.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 670 mm bore 241/670B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 241/670B by envelope alone: the 28000 kN C0 and 1340 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The cylindrical-bore 241/670B and its tapered-bore counterpart 241/670BK30 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Never substitute 241/670B by envelope alone: the 28000 kN C0 and 1340 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 670 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The 14100/28000 kN ratings, 1340 kN Pu and 1530000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 241/670B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 241/670B?",
        "a": "241/670B is an NTN double-row spherical roller bearing to ISO 15: 670 mm bore, 1090 mm OD and 412 mm width (26.378 × 42.913 × 16.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 14100 kN, C0 28000 kN, Pu 1340 kN, grease limiting speed 230 r/min, oil 300 r/min, mass about 1530000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "241/670B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 241/670BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 241/670B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 241/670B?",
        "a": "241/670B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 241/670B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 14100 kN C / 28000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "241-670BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 241-670BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "241-670b",
      "241-670B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "241-670BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 241/670BK30",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 670,
    "D_mm": 1090,
    "B_mm": 412,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 14100,
    "static_load_kN": 28000,
    "fatigue_load_limit_kN": 1340,
    "limiting_speed_rpm": 230,
    "max_rpm": 230,
    "speed_oil_rpm": 300,
    "weight_g": 1510000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "241/670BK30 belongs to the 24100 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 670 mm (two-digit code ×5, with the 00–03 exception table), and 1090 mm OD / 412 mm width follow the general plan. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the basic cage. Grease/oil ratio: the 230 r/min limiting value is .77 of the 300 r/min oil value; heavy 412 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 670 mm bore 241/670BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 230 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 412 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 241/670BK30 by envelope alone: the 28000 kN C0 and 1340 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Never substitute 241/670BK30 by envelope alone: the 28000 kN C0 and 1340 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The 14100/28000 kN ratings, 1340 kN Pu and 1510000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 241/670BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 241/670BK30?",
        "a": "241/670BK30 is an NTN double-row spherical roller bearing to ISO 15: 670 mm bore, 1090 mm OD and 412 mm width (26.378 × 42.913 × 16.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 14100 kN, C0 28000 kN, Pu 1340 kN, grease limiting speed 230 r/min, oil 300 r/min, mass about 1510000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 241/670BK30 mounts on a matching adapter or withdrawal sleeve on a plain 670 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 241/670B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 241/670BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 241/670BK30?",
        "a": "241/670BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 241/670BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 14100 kN C / 28000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "241-670B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 241-670B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "241-670bk30",
      "241-670BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "232-670B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 232/670B",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 670,
    "D_mm": 1220,
    "B_mm": 438,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 17900,
    "static_load_kN": 32000,
    "fatigue_load_limit_kN": 1770,
    "limiting_speed_rpm": 220,
    "max_rpm": 220,
    "speed_oil_rpm": 280,
    "weight_g": 2270000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 232/670B denotes the 670 mm bore spherical roller bearing (17900 kN C / 32000 kN C0) in the 23200 series, the self-aligning choice for heavy combined load. Numbering ties 232/670B to its envelope and execution: same-number EA versus EM or plain variants share the 670 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Open by design, 232/670B requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. The 275.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 438 mm-wide ring seats fully on both sides. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 670 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 670 mm bore 232/670B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 232/670B by envelope alone: the 32000 kN C0 and 1770 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Oil relubrication toward 280 r/min needs drain and level design; flooding the 438 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 232/670B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 17900 kN rating no longer applies.",
      "The 17900/32000 kN ratings, 1770 kN Pu and 2270000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 232/670B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 232/670B?",
        "a": "232/670B is an NTN double-row spherical roller bearing to ISO 15: 670 mm bore, 1220 mm OD and 438 mm width (26.378 × 48.031 × 17.244 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 17900 kN, C0 32000 kN, Pu 1770 kN, grease limiting speed 220 r/min, oil 280 r/min, mass about 2270000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "232/670B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 232/670BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 232/670B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 232/670B?",
        "a": "232/670B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 232/670B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 17900 kN C / 32000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "232-670BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 232-670BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "232-670b",
      "232-670B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "232-670BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 232/670BK",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 670,
    "D_mm": 1220,
    "B_mm": 438,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 17900,
    "static_load_kN": 32000,
    "fatigue_load_limit_kN": 1770,
    "limiting_speed_rpm": 220,
    "max_rpm": 220,
    "speed_oil_rpm": 280,
    "weight_g": 2200000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "232/670BK is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 670×1220×438 mm to ISO 15, with pressed-steel cage (standard execution). Digit by digit the code reads as spherical-roller dimension series plus 670 mm bore; the 438 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Pu 1770 kN is the catalogue fatigue load limit for 232/670BK, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. With about 26.7 kN of C per millimetre of the 670 mm bore, 232/670BK screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 232/670BK leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 670 mm bore 232/670BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 670 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 232/670B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 17900 kN rating no longer applies.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 232/670BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 17900/32000 kN ratings, 1770 kN Pu and 2200000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 232/670BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 232/670BK?",
        "a": "232/670BK is an NTN double-row spherical roller bearing to ISO 15: 670 mm bore, 1220 mm OD and 438 mm width (26.378 × 48.031 × 17.244 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 17900 kN, C0 32000 kN, Pu 1770 kN, grease limiting speed 220 r/min, oil 280 r/min, mass about 2200000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 232/670BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 232/670B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 232/670BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 232/670BK?",
        "a": "232/670BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 232/670BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 17900 kN C / 32000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "232-670B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 232-670B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "232-670bk",
      "232-670BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-710",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/710",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 710,
    "D_mm": 950,
    "B_mm": 180,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4950,
    "static_load_kN": 11500,
    "fatigue_load_limit_kN": 665,
    "limiting_speed_rpm": 280,
    "max_rpm": 280,
    "speed_oil_rpm": 370,
    "weight_g": 375000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "239/710 is the basic execution of NTN's spherical roller range for a 710 mm shaft — 4950 kN basic dynamic capacity in a 375000 g, open ISO 15 envelope. Numbering ties 239/710 to its envelope and execution: same-number EA versus EM or plain variants share the 710 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Pu 665 kN is the catalogue fatigue load limit for 239/710, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. 710 mm bore is 27.953 in and 950 mm OD is 37.402 in; the ISO 15 envelope swaps between brands, but the 4950/11500 kN ratings and cage design are NTN 2203E values. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 710 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 710 mm bore 239/710 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 239/710 carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 710×950 mm envelope is identical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 239/710 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Oil relubrication toward 370 r/min needs drain and level design; flooding the 180 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 239/710 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 4950/11500 kN ratings, 665 kN Pu and 375000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/710 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/710?",
        "a": "239/710 is an NTN double-row spherical roller bearing to ISO 15: 710 mm bore, 950 mm OD and 180 mm width (27.953 × 37.402 × 7.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4950 kN, C0 11500 kN, Pu 665 kN, grease limiting speed 280 r/min, oil 370 r/min, mass about 375000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "239/710 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 239/710K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/710 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/710?",
        "a": "239/710 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/710 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4950 kN C / 11500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-710K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 239-710K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-710"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-710K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/710K",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 710,
    "D_mm": 950,
    "B_mm": 180,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4950,
    "static_load_kN": 11500,
    "fatigue_load_limit_kN": 665,
    "limiting_speed_rpm": 280,
    "max_rpm": 280,
    "speed_oil_rpm": 370,
    "weight_g": 363000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 710 mm shaft, NTN supplies 239/710K: sphered outer raceway, two roller rows, pressed-steel cage (standard execution), oil speed 370 r/min. Reading the full code: the number gives the 710×950 mm envelope, — names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. Pu 665 kN is the catalogue fatigue load limit for 239/710K, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Grease/oil ratio: the 280 r/min limiting value is .76 of the 370 r/min oil value; heavy 180 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 710 mm set.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 710 mm bore 239/710K is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 180 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 239/710K by envelope alone: the 11500 kN C0 and 665 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Never substitute 239/710K by envelope alone: the 11500 kN C0 and 665 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 239/710K in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 4950/11500 kN ratings, 665 kN Pu and 363000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/710K (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/710K?",
        "a": "239/710K is an NTN double-row spherical roller bearing to ISO 15: 710 mm bore, 950 mm OD and 180 mm width (27.953 × 37.402 × 7.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4950 kN, C0 11500 kN, Pu 665 kN, grease limiting speed 280 r/min, oil 370 r/min, mass about 363000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 239/710K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 239/710."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/710K is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/710K?",
        "a": "239/710K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/710K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4950 kN C / 11500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-710",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 239-710 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-710k",
      "239-710K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "230-710B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 230/710B",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 710,
    "D_mm": 1030,
    "B_mm": 236,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 8000,
    "static_load_kN": 16200,
    "fatigue_load_limit_kN": 1140,
    "limiting_speed_rpm": 260,
    "max_rpm": 260,
    "speed_oil_rpm": 340,
    "weight_g": 663000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 230/710B denotes the 710 mm bore spherical roller bearing (8000 kN C / 16200 kN C0) in the 23000 series, the self-aligning choice for heavy combined load. Reading the full code: the number gives the 710×1030 mm envelope, — names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and plain outer ring (no D1/W33 groove) completes the order number. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the basic cage. Speed planning: 260 r/min grease limiting speed is the cage/kinematic ceiling and 340 r/min is the oil-lubricated value for the 710 mm bore; vibrating screens rarely approach either and are load/cage limited instead. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 230/710B leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 710 mm bore 230/710B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 340 r/min needs drain and level design; flooding the 236 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Oil relubrication toward 340 r/min needs drain and level design; flooding the 236 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Oil relubrication toward 340 r/min needs drain and level design; flooding the 236 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Never substitute 230/710B by envelope alone: the 16200 kN C0 and 1140 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The 8000/16200 kN ratings, 1140 kN Pu and 663000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 230/710B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 230/710B?",
        "a": "230/710B is an NTN double-row spherical roller bearing to ISO 15: 710 mm bore, 1030 mm OD and 236 mm width (27.953 × 40.551 × 9.291 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 8000 kN, C0 16200 kN, Pu 1140 kN, grease limiting speed 260 r/min, oil 340 r/min, mass about 663000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "230/710B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 230/710BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 230/710B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 230/710B?",
        "a": "230/710B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 230/710B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 8000 kN C / 16200 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "230-710BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 230-710BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "230-710b",
      "230-710B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "230-710BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 230/710BK",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 710,
    "D_mm": 1030,
    "B_mm": 236,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 8000,
    "static_load_kN": 16200,
    "fatigue_load_limit_kN": 1140,
    "limiting_speed_rpm": 260,
    "max_rpm": 260,
    "speed_oil_rpm": 340,
    "weight_g": 640000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 710 mm shaft, NTN supplies 230/710BK: sphered outer raceway, two roller rows, pressed-steel cage (standard execution), oil speed 340 r/min. The leading digits are the ISO 15 dimension series (23000 series); the bore code resolves to 710 mm (two-digit code ×5, with the 00–03 exception table), and 1030 mm OD / 236 mm width follow the general plan. NTN prints two speeds for 230/710BK: 260 r/min grease and 340 r/min oil — the gap of 80 r/min reflects oil cooling of the heavy roller set. 710 mm bore is 27.953 in and 1030 mm OD is 40.551 in; the ISO 15 envelope swaps between brands, but the 8000/16200 kN ratings and cage design are NTN 2203E values. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 710 mm bore 230/710BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 230/710BK carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 710×1030 mm envelope is identical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 230/710BK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 710 mm bearing, and drive-up procedures differ.",
      "Oil relubrication toward 340 r/min needs drain and level design; flooding the 236 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 8000/16200 kN ratings, 1140 kN Pu and 640000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 230/710BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 230/710BK?",
        "a": "230/710BK is an NTN double-row spherical roller bearing to ISO 15: 710 mm bore, 1030 mm OD and 236 mm width (27.953 × 40.551 × 9.291 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 8000 kN, C0 16200 kN, Pu 1140 kN, grease limiting speed 260 r/min, oil 340 r/min, mass about 640000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 230/710BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 230/710B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 230/710BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 230/710BK?",
        "a": "230/710BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 230/710BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 8000 kN C / 16200 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "230-710B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 230-710B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "230-710bk",
      "230-710BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "240-710B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 240/710B",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 710,
    "D_mm": 1030,
    "B_mm": 315,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 10300,
    "static_load_kN": 22500,
    "fatigue_load_limit_kN": 1150,
    "limiting_speed_rpm": 230,
    "max_rpm": 230,
    "speed_oil_rpm": 300,
    "weight_g": 884000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 240/710B with a cylindrical bore and plain outer ring (no D1/W33 groove): 710 mm bore, 1030 mm OD, 315 mm width, rated 230 r/min on grease. Numbering ties 240/710B to its envelope and execution: same-number EA versus EM or plain variants share the 710 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Catalogue mass 884000 g (884.00 kg) for the 710×1030×315 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 240/710B leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 710 mm bore 240/710B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 240/710B by envelope alone: the 22500 kN C0 and 1150 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Do not confuse EA and EM at the same number: 240/710B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 710×1030 mm envelope is identical.",
      "The cylindrical-bore 240/710B and its tapered-bore counterpart 240/710BK30 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 710 mm bearing, and drive-up procedures differ.",
      "The 10300/22500 kN ratings, 1150 kN Pu and 884000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/710B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 240/710B?",
        "a": "240/710B is an NTN double-row spherical roller bearing to ISO 15: 710 mm bore, 1030 mm OD and 315 mm width (27.953 × 40.551 × 12.402 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 10300 kN, C0 22500 kN, Pu 1150 kN, grease limiting speed 230 r/min, oil 300 r/min, mass about 884000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "240/710B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 240/710BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 240/710B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 240/710B?",
        "a": "240/710B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 240/710B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 10300 kN C / 22500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "240-710BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 240-710BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "240-710b",
      "240-710B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "240-710BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 240/710BK30",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 710,
    "D_mm": 1030,
    "B_mm": 315,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 10300,
    "static_load_kN": 22500,
    "fatigue_load_limit_kN": 1150,
    "limiting_speed_rpm": 230,
    "max_rpm": 230,
    "speed_oil_rpm": 300,
    "weight_g": 870000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 240/710BK30 with a 1:30 tapered bore (K30) and plain outer ring (no D1/W33 groove): 710 mm bore, 1030 mm OD, 315 mm width, rated 230 r/min on grease. Numbering ties 240/710BK30 to its envelope and execution: same-number EA versus EM or plain variants share the 710 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. At 10300 kN C and 870000 g mass the 24000 series part is built for shock and vibration; the 315 mm-wide ring needs square abutments to keep both rows equally loaded. Catalogue mass 870000 g (870.00 kg) for the 710×1030×315 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Mount 240/710BK30 on its adapter or withdrawal sleeve on the 710 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 710 mm bore 240/710BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 240/710BK30 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 240/710B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Oil relubrication toward 300 r/min needs drain and level design; flooding the 315 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 230 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 10300/22500 kN ratings, 1150 kN Pu and 870000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/710BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 240/710BK30?",
        "a": "240/710BK30 is an NTN double-row spherical roller bearing to ISO 15: 710 mm bore, 1030 mm OD and 315 mm width (27.953 × 40.551 × 12.402 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 10300 kN, C0 22500 kN, Pu 1150 kN, grease limiting speed 230 r/min, oil 300 r/min, mass about 870000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 240/710BK30 mounts on a matching adapter or withdrawal sleeve on a plain 710 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 240/710B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 240/710BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 240/710BK30?",
        "a": "240/710BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 240/710BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 10300 kN C / 22500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "240-710B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 240-710B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "240-710bk30",
      "240-710BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "231-710B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 231/710B",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 710,
    "D_mm": 1150,
    "B_mm": 345,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 13000,
    "static_load_kN": 24900,
    "fatigue_load_limit_kN": 1470,
    "limiting_speed_rpm": 220,
    "max_rpm": 220,
    "speed_oil_rpm": 280,
    "weight_g": 1420000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 231/710B denotes the 710 mm bore spherical roller bearing (13000 kN C / 24900 kN C0) in the 23100 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (23100 series); the bore code resolves to 710 mm (two-digit code ×5, with the 00–03 exception table), and 1150 mm OD / 345 mm width follow the general plan. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Pu 1470 kN against C0 24900 kN anchors the contamination derating; for dirty mining duty the adjusted life of 231/710B moves with cleanliness far more than with small C variations. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 710 mm bore 231/710B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 231/710B by envelope alone: the 24900 kN C0 and 1470 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The cylindrical-bore 231/710B and its tapered-bore counterpart 231/710BK share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 231/710B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 231/710B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 13000/24900 kN ratings, 1470 kN Pu and 1420000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 231/710B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 231/710B?",
        "a": "231/710B is an NTN double-row spherical roller bearing to ISO 15: 710 mm bore, 1150 mm OD and 345 mm width (27.953 × 45.276 × 13.583 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 13000 kN, C0 24900 kN, Pu 1470 kN, grease limiting speed 220 r/min, oil 280 r/min, mass about 1420000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "231/710B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 231/710BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 231/710B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 231/710B?",
        "a": "231/710B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 231/710B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 13000 kN C / 24900 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "231-710BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 231-710BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "231-710b",
      "231-710B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "231-710BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 231/710BK",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 710,
    "D_mm": 1150,
    "B_mm": 345,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 13000,
    "static_load_kN": 24900,
    "fatigue_load_limit_kN": 1470,
    "limiting_speed_rpm": 220,
    "max_rpm": 220,
    "speed_oil_rpm": 280,
    "weight_g": 1380000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 231/710BK identifies a 710×1150×345 mm (27.953 × 45.276 × 13.583 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Reading the full code: the number gives the 710×1150 mm envelope, — names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. Suffix reading on 231/710BK: the bare number is the standard open execution; K marks the 1:12 tapered bore; B marks the standard large-bore internal design on slash-size 230–232 series; quote the full code because each suffix is a distinct article. Equivalent-load planning keeps a radial plus moderate axial combination on 231/710BK; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 710 mm bore 231/710BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 345 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Oil relubrication toward 280 r/min needs drain and level design; flooding the 345 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 231/710BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 345 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 13000/24900 kN ratings, 1470 kN Pu and 1380000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 231/710BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 231/710BK?",
        "a": "231/710BK is an NTN double-row spherical roller bearing to ISO 15: 710 mm bore, 1150 mm OD and 345 mm width (27.953 × 45.276 × 13.583 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 13000 kN, C0 24900 kN, Pu 1470 kN, grease limiting speed 220 r/min, oil 280 r/min, mass about 1380000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 231/710BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 231/710B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 231/710BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 231/710BK?",
        "a": "231/710BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 231/710BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 13000 kN C / 24900 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "231-710B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 231-710B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "231-710bk",
      "231-710BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "241-710B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 241/710B",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 710,
    "D_mm": 1150,
    "B_mm": 438,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 16100,
    "static_load_kN": 32000,
    "fatigue_load_limit_kN": 1190,
    "limiting_speed_rpm": 220,
    "max_rpm": 220,
    "speed_oil_rpm": 280,
    "weight_g": 1800000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "241/710B is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 710×1150×438 mm to ISO 15, with pressed-steel cage (standard execution). Reading the full code: the number gives the 710×1150 mm envelope, — names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and plain outer ring (no D1/W33 groove) completes the order number. Suffix reading on 241/710B: the bare number is the standard open execution; B marks the standard large-bore internal design on slash-size 230–232 series; quote the full code because each suffix is a distinct article. Catalogue mass 1800000 g (1800.00 kg) for the 710×1150×438 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Fillet radii on shaft and housing must clear the ring chamfers of the 438 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 710 mm bore 241/710B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The cylindrical-bore 241/710B and its tapered-bore counterpart 241/710BK30 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 710 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Never substitute 241/710B by envelope alone: the 32000 kN C0 and 1190 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 438 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 16100/32000 kN ratings, 1190 kN Pu and 1800000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 241/710B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 241/710B?",
        "a": "241/710B is an NTN double-row spherical roller bearing to ISO 15: 710 mm bore, 1150 mm OD and 438 mm width (27.953 × 45.276 × 17.244 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 16100 kN, C0 32000 kN, Pu 1190 kN, grease limiting speed 220 r/min, oil 280 r/min, mass about 1800000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "241/710B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 241/710BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 241/710B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 241/710B?",
        "a": "241/710B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 241/710B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 16100 kN C / 32000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "241-710BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 241-710BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "241-710b",
      "241-710B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "241-710BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 241/710BK30",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 710,
    "D_mm": 1150,
    "B_mm": 438,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 16100,
    "static_load_kN": 32000,
    "fatigue_load_limit_kN": 1190,
    "limiting_speed_rpm": 220,
    "max_rpm": 220,
    "speed_oil_rpm": 280,
    "weight_g": 1770000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 710 mm shaft, NTN supplies 241/710BK30: sphered outer raceway, two roller rows, pressed-steel cage (standard execution), oil speed 280 r/min. Reading the full code: the number gives the 710×1150 mm envelope, — names the cage/capacity execution, K30 marks the 1:30 tapered bore for sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. The 1:30 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 710 mm bore assembly. Catalogue mass 1770000 g (1770.00 kg) for the 710×1150×438 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Fillet radii on shaft and housing must clear the ring chamfers of the 438 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 710 mm bore 241/710BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 710 mm bearing, and drive-up procedures differ.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 241/710B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 241/710B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Do not confuse EA and EM at the same number: 241/710BK30 carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 710×1150 mm envelope is identical.",
      "The 16100/32000 kN ratings, 1190 kN Pu and 1770000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 241/710BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 241/710BK30?",
        "a": "241/710BK30 is an NTN double-row spherical roller bearing to ISO 15: 710 mm bore, 1150 mm OD and 438 mm width (27.953 × 45.276 × 17.244 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 16100 kN, C0 32000 kN, Pu 1190 kN, grease limiting speed 220 r/min, oil 280 r/min, mass about 1770000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 241/710BK30 mounts on a matching adapter or withdrawal sleeve on a plain 710 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 241/710B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 241/710BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 241/710BK30?",
        "a": "241/710BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 241/710BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 16100 kN C / 32000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "241-710B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 241-710B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "241-710bk30",
      "241-710BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "232-710B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 232/710B",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 710,
    "D_mm": 1280,
    "B_mm": 450,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 18100,
    "static_load_kN": 32500,
    "fatigue_load_limit_kN": 1200,
    "limiting_speed_rpm": 200,
    "max_rpm": 200,
    "speed_oil_rpm": 260,
    "weight_g": 2540000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "232/710B belongs to the 23200 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. Reading the full code: the number gives the 710×1280 mm envelope, — names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and plain outer ring (no D1/W33 groove) completes the order number. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Selection: the C0/C ratio of 1.80 (32500/18100 kN) reflects the heavy static and shock proportioning of 232/710B; size the equivalent load at the required L10 with shock factor for the application. Never mount 232/710B by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 1280 mm race.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 710 mm bore 232/710B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 200 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 232/710B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 232/710B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 710 mm bearing, and drive-up procedures differ.",
      "The 18100/32500 kN ratings, 1200 kN Pu and 2540000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 232/710B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 232/710B?",
        "a": "232/710B is an NTN double-row spherical roller bearing to ISO 15: 710 mm bore, 1280 mm OD and 450 mm width (27.953 × 50.394 × 17.717 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 18100 kN, C0 32500 kN, Pu 1200 kN, grease limiting speed 200 r/min, oil 260 r/min, mass about 2540000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "232/710B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 232/710BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 232/710B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 232/710B?",
        "a": "232/710B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 232/710B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 18100 kN C / 32500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "232-710BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 232-710BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "232-710b",
      "232-710B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "232-710BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 232/710BK",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 710,
    "D_mm": 1280,
    "B_mm": 450,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 18100,
    "static_load_kN": 32500,
    "fatigue_load_limit_kN": 1200,
    "limiting_speed_rpm": 200,
    "max_rpm": 200,
    "speed_oil_rpm": 260,
    "weight_g": 2470000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "232/710BK belongs to the 23200 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. Numbering ties 232/710BK to its envelope and execution: same-number EA versus EM or plain variants share the 710 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Open by design, 232/710BK requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Selection: the C0/C ratio of 1.80 (32500/18100 kN) reflects the heavy static and shock proportioning of 232/710BK; size the equivalent load at the required L10 with shock factor for the application. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 710 mm bore 232/710BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 710 mm bearing, and drive-up procedures differ.",
      "Do not confuse EA and EM at the same number: 232/710BK carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 710×1280 mm envelope is identical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 18100 kN rating no longer applies.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 18100 kN rating no longer applies.",
      "The 18100/32500 kN ratings, 1200 kN Pu and 2470000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 232/710BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 232/710BK?",
        "a": "232/710BK is an NTN double-row spherical roller bearing to ISO 15: 710 mm bore, 1280 mm OD and 450 mm width (27.953 × 50.394 × 17.717 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 18100 kN, C0 32500 kN, Pu 1200 kN, grease limiting speed 200 r/min, oil 260 r/min, mass about 2470000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 232/710BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 232/710B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 232/710BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 232/710BK?",
        "a": "232/710BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 232/710BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 18100 kN C / 32500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "232-710B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 232-710B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "232-710bk",
      "232-710BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-750",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/750",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 750,
    "D_mm": 1000,
    "B_mm": 185,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5600,
    "static_load_kN": 13000,
    "fatigue_load_limit_kN": 990,
    "limiting_speed_rpm": 260,
    "max_rpm": 260,
    "speed_oil_rpm": 340,
    "weight_g": 412000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 239/750 denotes the 750 mm bore spherical roller bearing (5600 kN C / 13000 kN C0) in the 23900 series, the self-aligning choice for heavy combined load. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (cylindrical), lubrication feature (none); 239/750 is assembled exactly in that order. Open by design, 239/750 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Selection: the C0/C ratio of 2.32 (13000/5600 kN) reflects the heavy static and shock proportioning of 239/750; size the equivalent load at the required L10 with shock factor for the application. Fillet radii on shaft and housing must clear the ring chamfers of the 185 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 750 mm bore 239/750 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The cylindrical-bore 239/750 and its tapered-bore counterpart 239/750K share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The cylindrical-bore 239/750 and its tapered-bore counterpart 239/750K share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 260 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 5600 kN rating no longer applies.",
      "The 5600/13000 kN ratings, 990 kN Pu and 412000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/750 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/750?",
        "a": "239/750 is an NTN double-row spherical roller bearing to ISO 15: 750 mm bore, 1000 mm OD and 185 mm width (29.528 × 39.37 × 7.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5600 kN, C0 13000 kN, Pu 990 kN, grease limiting speed 260 r/min, oil 340 r/min, mass about 412000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "239/750 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 239/750K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/750 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/750?",
        "a": "239/750 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/750 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5600 kN C / 13000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-750K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 239-750K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-750"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-750K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/750K",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 750,
    "D_mm": 1000,
    "B_mm": 185,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5600,
    "static_load_kN": 13000,
    "fatigue_load_limit_kN": 990,
    "limiting_speed_rpm": 260,
    "max_rpm": 260,
    "speed_oil_rpm": 340,
    "weight_g": 399000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 239/750K identifies a 750×1000×185 mm (29.528 × 39.37 × 7.283 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Numbering ties 239/750K to its envelope and execution: same-number EA versus EM or plain variants share the 750 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The 125.0 mm radial section over the 750 mm bore carries two roller rows; capacity per millimetre of bore is about 7.5 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Selection: the C0/C ratio of 2.32 (13000/5600 kN) reflects the heavy static and shock proportioning of 239/750K; size the equivalent load at the required L10 with shock factor for the application. Fillet radii on shaft and housing must clear the ring chamfers of the 185 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 750 mm bore 239/750K is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 750 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Oil relubrication toward 340 r/min needs drain and level design; flooding the 185 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 239/750: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 239/750: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 5600/13000 kN ratings, 990 kN Pu and 399000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/750K (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/750K?",
        "a": "239/750K is an NTN double-row spherical roller bearing to ISO 15: 750 mm bore, 1000 mm OD and 185 mm width (29.528 × 39.37 × 7.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5600 kN, C0 13000 kN, Pu 990 kN, grease limiting speed 260 r/min, oil 340 r/min, mass about 399000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 239/750K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 239/750."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/750K is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/750K?",
        "a": "239/750K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/750K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5600 kN C / 13000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-750",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 239-750 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-750k",
      "239-750K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "230-750B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 230/750B",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 750,
    "D_mm": 1090,
    "B_mm": 250,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 9100,
    "static_load_kN": 18300,
    "fatigue_load_limit_kN": 1290,
    "limiting_speed_rpm": 250,
    "max_rpm": 250,
    "speed_oil_rpm": 320,
    "weight_g": 790000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 230/750B with a cylindrical bore and plain outer ring (no D1/W33 groove): 750 mm bore, 1090 mm OD, 250 mm width, rated 250 r/min on grease. Numbering ties 230/750B to its envelope and execution: same-number EA versus EM or plain variants share the 750 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. With about 12.1 kN of C per millimetre of the 750 mm bore, 230/750B screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 750 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 750 mm bore 230/750B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 230/750B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 750×1090 mm envelope is identical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 9100 kN rating no longer applies.",
      "Never substitute 230/750B by envelope alone: the 18300 kN C0 and 1290 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 750 mm bearing, and drive-up procedures differ.",
      "The 9100/18300 kN ratings, 1290 kN Pu and 790000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 230/750B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 230/750B?",
        "a": "230/750B is an NTN double-row spherical roller bearing to ISO 15: 750 mm bore, 1090 mm OD and 250 mm width (29.528 × 42.913 × 9.843 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 9100 kN, C0 18300 kN, Pu 1290 kN, grease limiting speed 250 r/min, oil 320 r/min, mass about 790000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "230/750B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 230/750BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 230/750B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 230/750B?",
        "a": "230/750B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 230/750B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 9100 kN C / 18300 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "230-750BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 230-750BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "230-750b",
      "230-750B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "230-750BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 230/750BK",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 750,
    "D_mm": 1090,
    "B_mm": 250,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 9100,
    "static_load_kN": 18300,
    "fatigue_load_limit_kN": 1290,
    "limiting_speed_rpm": 250,
    "max_rpm": 250,
    "speed_oil_rpm": 320,
    "weight_g": 763000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "230/750BK is the basic execution of NTN's spherical roller range for a 750 mm shaft — 9100 kN basic dynamic capacity in a 763000 g, open ISO 15 envelope. The leading digits are the ISO 15 dimension series (23000 series); the bore code resolves to 750 mm (two-digit code ×5, with the 00–03 exception table), and 1090 mm OD / 250 mm width follow the general plan. NTN prints two speeds for 230/750BK: 250 r/min grease and 320 r/min oil — the gap of 70 r/min reflects oil cooling of the heavy roller set. With about 12.1 kN of C per millimetre of the 750 mm bore, 230/750BK screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Mount 230/750BK on its adapter or withdrawal sleeve on the 750 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 750 mm bore 230/750BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 230/750B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 750 mm bearing, and drive-up procedures differ.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 230/750BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Oil relubrication toward 320 r/min needs drain and level design; flooding the 250 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 9100/18300 kN ratings, 1290 kN Pu and 763000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 230/750BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 230/750BK?",
        "a": "230/750BK is an NTN double-row spherical roller bearing to ISO 15: 750 mm bore, 1090 mm OD and 250 mm width (29.528 × 42.913 × 9.843 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 9100 kN, C0 18300 kN, Pu 1290 kN, grease limiting speed 250 r/min, oil 320 r/min, mass about 763000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 230/750BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 230/750B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 230/750BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 230/750BK?",
        "a": "230/750BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 230/750BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 9100 kN C / 18300 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "230-750B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 230-750B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "230-750bk",
      "230-750BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "240-750B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 240/750B",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 750,
    "D_mm": 1090,
    "B_mm": 335,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 11300,
    "static_load_kN": 24600,
    "fatigue_load_limit_kN": 1230,
    "limiting_speed_rpm": 220,
    "max_rpm": 220,
    "speed_oil_rpm": 280,
    "weight_g": 1060000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "240/750B is the basic execution of NTN's spherical roller range for a 750 mm shaft — 11300 kN basic dynamic capacity in a 1060000 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 750 mm bore; the 335 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. NTN prints two speeds for 240/750B: 220 r/min grease and 280 r/min oil — the gap of 60 r/min reflects oil cooling of the heavy roller set. Grease/oil ratio: the 220 r/min limiting value is .79 of the 280 r/min oil value; heavy 335 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 750 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 750 mm bore 240/750B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 335 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 220 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 220 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Oil relubrication toward 280 r/min needs drain and level design; flooding the 335 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 11300/24600 kN ratings, 1230 kN Pu and 1060000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/750B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 240/750B?",
        "a": "240/750B is an NTN double-row spherical roller bearing to ISO 15: 750 mm bore, 1090 mm OD and 335 mm width (29.528 × 42.913 × 13.189 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 11300 kN, C0 24600 kN, Pu 1230 kN, grease limiting speed 220 r/min, oil 280 r/min, mass about 1060000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "240/750B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 240/750BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 240/750B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 240/750B?",
        "a": "240/750B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 240/750B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 11300 kN C / 24600 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "240-750BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 240-750BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "240-750b",
      "240-750B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "240-750BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 240/750BK30",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 750,
    "D_mm": 1090,
    "B_mm": 335,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 11300,
    "static_load_kN": 24600,
    "fatigue_load_limit_kN": 1230,
    "limiting_speed_rpm": 220,
    "max_rpm": 220,
    "speed_oil_rpm": 280,
    "weight_g": 1040000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "240/750BK30 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 750×1090×335 mm to ISO 15, with pressed-steel cage (standard execution). Numbering ties 240/750BK30 to its envelope and execution: same-number EA versus EM or plain variants share the 750 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. NTN prints two speeds for 240/750BK30: 220 r/min grease and 280 r/min oil — the gap of 60 r/min reflects oil cooling of the heavy roller set. Selection: the C0/C ratio of 2.18 (24600/11300 kN) reflects the heavy static and shock proportioning of 240/750BK30; size the equivalent load at the required L10 with shock factor for the application. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 750 mm bore 240/750BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 220 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 240/750B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 335 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Oil relubrication toward 280 r/min needs drain and level design; flooding the 335 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 11300/24600 kN ratings, 1230 kN Pu and 1040000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/750BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 240/750BK30?",
        "a": "240/750BK30 is an NTN double-row spherical roller bearing to ISO 15: 750 mm bore, 1090 mm OD and 335 mm width (29.528 × 42.913 × 13.189 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 11300 kN, C0 24600 kN, Pu 1230 kN, grease limiting speed 220 r/min, oil 280 r/min, mass about 1040000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 240/750BK30 mounts on a matching adapter or withdrawal sleeve on a plain 750 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 240/750B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 240/750BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 240/750BK30?",
        "a": "240/750BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 240/750BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 11300 kN C / 24600 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "240-750B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 240-750B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "240-750bk30",
      "240-750BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "231-750B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 231/750B",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 750,
    "D_mm": 1220,
    "B_mm": 365,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 14300,
    "static_load_kN": 27200,
    "fatigue_load_limit_kN": 1130,
    "limiting_speed_rpm": 200,
    "max_rpm": 200,
    "speed_oil_rpm": 260,
    "weight_g": 1700000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 231/750B with a cylindrical bore and plain outer ring (no D1/W33 groove): 750 mm bore, 1220 mm OD, 365 mm width, rated 200 r/min on grease. Reading the full code: the number gives the 750×1220 mm envelope, — names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and plain outer ring (no D1/W33 groove) completes the order number. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the basic cage. 750 mm bore is 29.528 in and 1220 mm OD is 48.031 in; the ISO 15 envelope swaps between brands, but the 14300/27200 kN ratings and cage design are NTN 2203E values. Fit the cylindrical-bore 231/750B with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 750 mm bore 231/750B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 365 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 231/750B by envelope alone: the 27200 kN C0 and 1130 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 750 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Never substitute 231/750B by envelope alone: the 27200 kN C0 and 1130 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The 14300/27200 kN ratings, 1130 kN Pu and 1700000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 231/750B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 231/750B?",
        "a": "231/750B is an NTN double-row spherical roller bearing to ISO 15: 750 mm bore, 1220 mm OD and 365 mm width (29.528 × 48.031 × 14.37 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 14300 kN, C0 27200 kN, Pu 1130 kN, grease limiting speed 200 r/min, oil 260 r/min, mass about 1700000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "231/750B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 231/750BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 231/750B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 231/750B?",
        "a": "231/750B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 231/750B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 14300 kN C / 27200 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "231-750BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 231-750BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "231-750b",
      "231-750B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "231-750BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 231/750BK",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 750,
    "D_mm": 1220,
    "B_mm": 365,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 14300,
    "static_load_kN": 27200,
    "fatigue_load_limit_kN": 1130,
    "limiting_speed_rpm": 200,
    "max_rpm": 200,
    "speed_oil_rpm": 260,
    "weight_g": 1650000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 750 mm shaft, NTN supplies 231/750BK: sphered outer raceway, two roller rows, pressed-steel cage (standard execution), oil speed 260 r/min. Reading the full code: the number gives the 750×1220 mm envelope, — names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. 750 mm bore is 29.528 in and 1220 mm OD is 48.031 in; the ISO 15 envelope swaps between brands, but the 14300/27200 kN ratings and cage design are NTN 2203E values. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 750 mm set.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 750 mm bore 231/750BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 200 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 14300 kN rating no longer applies.",
      "Never substitute 231/750BK by envelope alone: the 27200 kN C0 and 1130 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 750 mm bearing, and drive-up procedures differ.",
      "The 14300/27200 kN ratings, 1130 kN Pu and 1650000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 231/750BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 231/750BK?",
        "a": "231/750BK is an NTN double-row spherical roller bearing to ISO 15: 750 mm bore, 1220 mm OD and 365 mm width (29.528 × 48.031 × 14.37 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 14300 kN, C0 27200 kN, Pu 1130 kN, grease limiting speed 200 r/min, oil 260 r/min, mass about 1650000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 231/750BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 231/750B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 231/750BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 231/750BK?",
        "a": "231/750BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 231/750BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 14300 kN C / 27200 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "231-750B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 231-750B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "231-750bk",
      "231-750BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "232-750B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 232/750B",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 750,
    "D_mm": 1360,
    "B_mm": 475,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 20300,
    "static_load_kN": 36500,
    "fatigue_load_limit_kN": 1980,
    "limiting_speed_rpm": 180,
    "max_rpm": 180,
    "speed_oil_rpm": 240,
    "weight_g": 3050000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 232/750B with a cylindrical bore and plain outer ring (no D1/W33 groove): 750 mm bore, 1360 mm OD, 475 mm width, rated 180 r/min on grease. Numbering ties 232/750B to its envelope and execution: same-number EA versus EM or plain variants share the 750 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Pu 1980 kN is the catalogue fatigue load limit for 232/750B, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Catalogue mass 3050000 g (3050.00 kg) for the 750×1360×475 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 750 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 750 mm bore 232/750B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 232/750B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 180 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 232/750B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 232/750B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 20300/36500 kN ratings, 1980 kN Pu and 3050000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 232/750B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 232/750B?",
        "a": "232/750B is an NTN double-row spherical roller bearing to ISO 15: 750 mm bore, 1360 mm OD and 475 mm width (29.528 × 53.543 × 18.701 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 20300 kN, C0 36500 kN, Pu 1980 kN, grease limiting speed 180 r/min, oil 240 r/min, mass about 3050000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "232/750B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 232/750BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 232/750B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 232/750B?",
        "a": "232/750B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 232/750B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 20300 kN C / 36500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "232-750BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 232-750BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "232-750b",
      "232-750B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "232-750BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 232/750BK",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 750,
    "D_mm": 1360,
    "B_mm": 475,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 20300,
    "static_load_kN": 36500,
    "fatigue_load_limit_kN": 1980,
    "limiting_speed_rpm": 180,
    "max_rpm": 180,
    "speed_oil_rpm": 240,
    "weight_g": 2960000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 232/750BK identifies a 750×1360×475 mm (29.528 × 53.543 × 18.701 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Numbering ties 232/750BK to its envelope and execution: same-number EA versus EM or plain variants share the 750 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. NTN prints two speeds for 232/750BK: 180 r/min grease and 240 r/min oil — the gap of 60 r/min reflects oil cooling of the heavy roller set. Equivalent-load planning keeps a radial plus moderate axial combination on 232/750BK; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 750 mm set.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 750 mm bore 232/750BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 232/750BK carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 750×1360 mm envelope is identical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 180 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 180 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Oil relubrication toward 240 r/min needs drain and level design; flooding the 475 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 20300/36500 kN ratings, 1980 kN Pu and 2960000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 232/750BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 232/750BK?",
        "a": "232/750BK is an NTN double-row spherical roller bearing to ISO 15: 750 mm bore, 1360 mm OD and 475 mm width (29.528 × 53.543 × 18.701 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 20300 kN, C0 36500 kN, Pu 1980 kN, grease limiting speed 180 r/min, oil 240 r/min, mass about 2960000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 232/750BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 232/750B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 232/750BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 232/750BK?",
        "a": "232/750BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 232/750BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 20300 kN C / 36500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "232-750B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 232-750B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "232-750bk",
      "232-750BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-800",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/800",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 800,
    "D_mm": 1060,
    "B_mm": 195,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 6000,
    "static_load_kN": 13700,
    "fatigue_load_limit_kN": 1040,
    "limiting_speed_rpm": 240,
    "max_rpm": 240,
    "speed_oil_rpm": 310,
    "weight_g": 487000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 239/800 with a cylindrical bore and plain outer ring (no D1/W33 groove): 800 mm bore, 1060 mm OD, 195 mm width, rated 240 r/min on grease. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 800 mm (two-digit code ×5, with the 00–03 exception table), and 1060 mm OD / 195 mm width follow the general plan. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the basic cage. Equivalent-load planning keeps a radial plus moderate axial combination on 239/800; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Fit the cylindrical-bore 239/800 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 800 mm bore 239/800 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 239/800 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 239/800 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 800 mm bearing, and drive-up procedures differ.",
      "Never substitute 239/800 by envelope alone: the 13700 kN C0 and 1040 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The 6000/13700 kN ratings, 1040 kN Pu and 487000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/800 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/800?",
        "a": "239/800 is an NTN double-row spherical roller bearing to ISO 15: 800 mm bore, 1060 mm OD and 195 mm width (31.496 × 41.732 × 7.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 6000 kN, C0 13700 kN, Pu 1040 kN, grease limiting speed 240 r/min, oil 310 r/min, mass about 487000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "239/800 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 239/800K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/800 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/800?",
        "a": "239/800 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/800 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 6000 kN C / 13700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-800K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 239-800K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-800"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-800K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/800K",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 800,
    "D_mm": 1060,
    "B_mm": 195,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 6000,
    "static_load_kN": 13700,
    "fatigue_load_limit_kN": 1040,
    "limiting_speed_rpm": 240,
    "max_rpm": 240,
    "speed_oil_rpm": 310,
    "weight_g": 471000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "239/800K is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 800×1060×195 mm to ISO 15, with pressed-steel cage (standard execution). Numbering ties 239/800K to its envelope and execution: same-number EA versus EM or plain variants share the 800 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Suffix reading on 239/800K: the bare number is the standard open execution; K marks the 1:12 tapered bore; quote the full code because each suffix is a distinct article. With about 7.5 kN of C per millimetre of the 800 mm bore, 239/800K screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 239/800K leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 800 mm bore 239/800K is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 800 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Never substitute 239/800K by envelope alone: the 13700 kN C0 and 1040 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 800 mm bearing, and drive-up procedures differ.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 195 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 6000/13700 kN ratings, 1040 kN Pu and 471000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/800K (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/800K?",
        "a": "239/800K is an NTN double-row spherical roller bearing to ISO 15: 800 mm bore, 1060 mm OD and 195 mm width (31.496 × 41.732 × 7.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 6000 kN, C0 13700 kN, Pu 1040 kN, grease limiting speed 240 r/min, oil 310 r/min, mass about 471000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 239/800K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 239/800."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/800K is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/800K?",
        "a": "239/800K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/800K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 6000 kN C / 13700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-800",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 239-800 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-800k",
      "239-800K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "230-800B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 230/800B",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 800,
    "D_mm": 1150,
    "B_mm": 258,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 9350,
    "static_load_kN": 19500,
    "fatigue_load_limit_kN": 1340,
    "limiting_speed_rpm": 220,
    "max_rpm": 220,
    "speed_oil_rpm": 290,
    "weight_g": 890000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 800 mm shaft, NTN supplies 230/800B: sphered outer raceway, two roller rows, pressed-steel cage (standard execution), oil speed 290 r/min. The leading digits are the ISO 15 dimension series (23000 series); the bore code resolves to 800 mm (two-digit code ×5, with the 00–03 exception table), and 1150 mm OD / 258 mm width follow the general plan. Pu 1340 kN is the catalogue fatigue load limit for 230/800B, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Pu 1340 kN against C0 19500 kN anchors the contamination derating; for dirty mining duty the adjusted life of 230/800B moves with cleanliness far more than with small C variations. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 230/800B leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 800 mm bore 230/800B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 220 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Oil relubrication toward 290 r/min needs drain and level design; flooding the 258 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 220 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 230/800B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 9350/19500 kN ratings, 1340 kN Pu and 890000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 230/800B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 230/800B?",
        "a": "230/800B is an NTN double-row spherical roller bearing to ISO 15: 800 mm bore, 1150 mm OD and 258 mm width (31.496 × 45.276 × 10.157 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 9350 kN, C0 19500 kN, Pu 1340 kN, grease limiting speed 220 r/min, oil 290 r/min, mass about 890000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "230/800B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 230/800BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 230/800B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 230/800B?",
        "a": "230/800B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 230/800B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 9350 kN C / 19500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "230-800BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 230-800BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "230-800b",
      "230-800B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "230-800BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 230/800BK",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 800,
    "D_mm": 1150,
    "B_mm": 258,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 9350,
    "static_load_kN": 19500,
    "fatigue_load_limit_kN": 1340,
    "limiting_speed_rpm": 220,
    "max_rpm": 220,
    "speed_oil_rpm": 290,
    "weight_g": 859000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "230/800BK is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 800×1150×258 mm to ISO 15, with pressed-steel cage (standard execution). Reading the full code: the number gives the 800×1150 mm envelope, — names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. Pu 1340 kN is the catalogue fatigue load limit for 230/800BK, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Pu 1340 kN against C0 19500 kN anchors the contamination derating; for dirty mining duty the adjusted life of 230/800BK moves with cleanliness far more than with small C variations. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 800 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 800 mm bore 230/800BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 230/800BK by envelope alone: the 19500 kN C0 and 1340 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 258 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Do not confuse EA and EM at the same number: 230/800BK carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 800×1150 mm envelope is identical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 230/800BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 9350/19500 kN ratings, 1340 kN Pu and 859000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 230/800BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 230/800BK?",
        "a": "230/800BK is an NTN double-row spherical roller bearing to ISO 15: 800 mm bore, 1150 mm OD and 258 mm width (31.496 × 45.276 × 10.157 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 9350 kN, C0 19500 kN, Pu 1340 kN, grease limiting speed 220 r/min, oil 290 r/min, mass about 859000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 230/800BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 230/800B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 230/800BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 230/800BK?",
        "a": "230/800BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 230/800BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 9350 kN C / 19500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "230-800B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 230-800B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "230-800bk",
      "230-800BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "240-800B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 240/800B",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 800,
    "D_mm": 1150,
    "B_mm": 345,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 12400,
    "static_load_kN": 27800,
    "fatigue_load_limit_kN": 1360,
    "limiting_speed_rpm": 200,
    "max_rpm": 200,
    "speed_oil_rpm": 260,
    "weight_g": 1190000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "240/800B is the basic execution of NTN's spherical roller range for a 800 mm shaft — 12400 kN basic dynamic capacity in a 1190000 g, open ISO 15 envelope. Reading the full code: the number gives the 800×1150 mm envelope, — names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and plain outer ring (no D1/W33 groove) completes the order number. Suffix reading on 240/800B: the bare number is the standard open execution; B marks the standard large-bore internal design on slash-size 230–232 series; quote the full code because each suffix is a distinct article. With about 15.5 kN of C per millimetre of the 800 mm bore, 240/800B screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Never mount 240/800B by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 1150 mm race.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 800 mm bore 240/800B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 240/800B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 800×1150 mm envelope is identical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 240/800B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 345 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 345 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 12400/27800 kN ratings, 1360 kN Pu and 1190000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/800B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 240/800B?",
        "a": "240/800B is an NTN double-row spherical roller bearing to ISO 15: 800 mm bore, 1150 mm OD and 345 mm width (31.496 × 45.276 × 13.583 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 12400 kN, C0 27800 kN, Pu 1360 kN, grease limiting speed 200 r/min, oil 260 r/min, mass about 1190000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "240/800B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 240/800BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 240/800B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 240/800B?",
        "a": "240/800B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 240/800B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 12400 kN C / 27800 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "240-800BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 240-800BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "240-800b",
      "240-800B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "240-800BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 240/800BK30",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 800,
    "D_mm": 1150,
    "B_mm": 345,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 12400,
    "static_load_kN": 27800,
    "fatigue_load_limit_kN": 1360,
    "limiting_speed_rpm": 200,
    "max_rpm": 200,
    "speed_oil_rpm": 260,
    "weight_g": 1170000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "240/800BK30 is the basic execution of NTN's spherical roller range for a 800 mm shaft — 12400 kN basic dynamic capacity in a 1170000 g, open ISO 15 envelope. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (K30), lubrication feature (none); 240/800BK30 is assembled exactly in that order. The 175.0 mm radial section over the 800 mm bore carries two roller rows; capacity per millimetre of bore is about 15.5 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. With about 15.5 kN of C per millimetre of the 800 mm bore, 240/800BK30 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 800 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 800 mm bore 240/800BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 240/800BK30 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Do not confuse EA and EM at the same number: 240/800BK30 carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 800×1150 mm envelope is identical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 345 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 240/800B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 12400/27800 kN ratings, 1360 kN Pu and 1170000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/800BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 240/800BK30?",
        "a": "240/800BK30 is an NTN double-row spherical roller bearing to ISO 15: 800 mm bore, 1150 mm OD and 345 mm width (31.496 × 45.276 × 13.583 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 12400 kN, C0 27800 kN, Pu 1360 kN, grease limiting speed 200 r/min, oil 260 r/min, mass about 1170000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 240/800BK30 mounts on a matching adapter or withdrawal sleeve on a plain 800 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 240/800B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 240/800BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 240/800BK30?",
        "a": "240/800BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 240/800BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 12400 kN C / 27800 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "240-800B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 240-800B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "240-800bk30",
      "240-800BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "231-800B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 231/800B",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 800,
    "D_mm": 1280,
    "B_mm": 375,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 16000,
    "static_load_kN": 31000,
    "fatigue_load_limit_kN": 1780,
    "limiting_speed_rpm": 180,
    "max_rpm": 180,
    "speed_oil_rpm": 240,
    "weight_g": 1890000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 231/800B with a cylindrical bore and plain outer ring (no D1/W33 groove): 800 mm bore, 1280 mm OD, 375 mm width, rated 180 r/min on grease. Reading the full code: the number gives the 800×1280 mm envelope, — names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and plain outer ring (no D1/W33 groove) completes the order number. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Selection: the C0/C ratio of 1.94 (31000/16000 kN) reflects the heavy static and shock proportioning of 231/800B; size the equivalent load at the required L10 with shock factor for the application. Fillet radii on shaft and housing must clear the ring chamfers of the 375 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 800 mm bore 231/800B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 375 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 375 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The cylindrical-bore 231/800B and its tapered-bore counterpart 231/800BK share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 231/800B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 16000/31000 kN ratings, 1780 kN Pu and 1890000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 231/800B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 231/800B?",
        "a": "231/800B is an NTN double-row spherical roller bearing to ISO 15: 800 mm bore, 1280 mm OD and 375 mm width (31.496 × 50.394 × 14.764 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 16000 kN, C0 31000 kN, Pu 1780 kN, grease limiting speed 180 r/min, oil 240 r/min, mass about 1890000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "231/800B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 231/800BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 231/800B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 231/800B?",
        "a": "231/800B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 231/800B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 16000 kN C / 31000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "231-800BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 231-800BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "231-800b",
      "231-800B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "231-800BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 231/800BK",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 800,
    "D_mm": 1280,
    "B_mm": 375,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 16000,
    "static_load_kN": 31000,
    "fatigue_load_limit_kN": 1780,
    "limiting_speed_rpm": 180,
    "max_rpm": 180,
    "speed_oil_rpm": 240,
    "weight_g": 1830000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 231/800BK denotes the 800 mm bore spherical roller bearing (16000 kN C / 31000 kN C0) in the 23100 series, the self-aligning choice for heavy combined load. Numbering ties 231/800BK to its envelope and execution: same-number EA versus EM or plain variants share the 800 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. At 16000 kN C and 1830000 g mass the 23100 series part is built for shock and vibration; the 375 mm-wide ring needs square abutments to keep both rows equally loaded. Catalogue mass 1830000 g (1830.00 kg) for the 800×1280×375 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 800 mm bore 231/800BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 231/800B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 800 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 231/800BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 180 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 16000/31000 kN ratings, 1780 kN Pu and 1830000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 231/800BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 231/800BK?",
        "a": "231/800BK is an NTN double-row spherical roller bearing to ISO 15: 800 mm bore, 1280 mm OD and 375 mm width (31.496 × 50.394 × 14.764 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 16000 kN, C0 31000 kN, Pu 1780 kN, grease limiting speed 180 r/min, oil 240 r/min, mass about 1830000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 231/800BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 231/800B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 231/800BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 231/800BK?",
        "a": "231/800BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 231/800BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 16000 kN C / 31000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "231-800B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 231-800B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "231-800bk",
      "231-800BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-850",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/850",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 850,
    "D_mm": 1120,
    "B_mm": 200,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 6500,
    "static_load_kN": 15100,
    "fatigue_load_limit_kN": 1080,
    "limiting_speed_rpm": 220,
    "max_rpm": 220,
    "speed_oil_rpm": 290,
    "weight_g": 550000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "239/850 is the basic execution of NTN's spherical roller range for a 850 mm shaft — 6500 kN basic dynamic capacity in a 550000 g, open ISO 15 envelope. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 850 mm (two-digit code ×5, with the 00–03 exception table), and 1120 mm OD / 200 mm width follow the general plan. Two symmetric roller rows share the load: C 6500 kN, C0 15100 kN (C0/C ≈ 2.32), with useful axial capacity in either direction alongside the dominant radial load. Catalogue mass 550000 g (550.00 kg) for the 850×1120×200 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 850 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 850 mm bore 239/850 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 290 r/min needs drain and level design; flooding the 200 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 6500 kN rating no longer applies.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 239/850 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 850 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The 6500/15100 kN ratings, 1080 kN Pu and 550000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/850 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/850?",
        "a": "239/850 is an NTN double-row spherical roller bearing to ISO 15: 850 mm bore, 1120 mm OD and 200 mm width (33.465 × 44.094 × 7.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 6500 kN, C0 15100 kN, Pu 1080 kN, grease limiting speed 220 r/min, oil 290 r/min, mass about 550000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "239/850 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 239/850K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/850 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/850?",
        "a": "239/850 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/850 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 6500 kN C / 15100 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-850K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 239-850K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-850"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-850K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/850K",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 850,
    "D_mm": 1120,
    "B_mm": 200,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 6500,
    "static_load_kN": 15100,
    "fatigue_load_limit_kN": 1080,
    "limiting_speed_rpm": 220,
    "max_rpm": 220,
    "speed_oil_rpm": 290,
    "weight_g": 532000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "239/850K is the basic execution of NTN's spherical roller range for a 850 mm shaft — 6500 kN basic dynamic capacity in a 532000 g, open ISO 15 envelope. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (K), lubrication feature (none); 239/850K is assembled exactly in that order. Pu 1080 kN is the catalogue fatigue load limit for 239/850K, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Pu 1080 kN against C0 15100 kN anchors the contamination derating; for dirty mining duty the adjusted life of 239/850K moves with cleanliness far more than with small C variations. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 850 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 850 mm bore 239/850K is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 290 r/min needs drain and level design; flooding the 200 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 239/850K in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 850 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 239/850K in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 6500/15100 kN ratings, 1080 kN Pu and 532000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/850K (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/850K?",
        "a": "239/850K is an NTN double-row spherical roller bearing to ISO 15: 850 mm bore, 1120 mm OD and 200 mm width (33.465 × 44.094 × 7.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 6500 kN, C0 15100 kN, Pu 1080 kN, grease limiting speed 220 r/min, oil 290 r/min, mass about 532000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 239/850K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 239/850."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/850K is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/850K?",
        "a": "239/850K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/850K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 6500 kN C / 15100 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-850",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 239-850 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-850k",
      "239-850K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "230-850B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 230/850B",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 850,
    "D_mm": 1220,
    "B_mm": 272,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 10900,
    "static_load_kN": 22700,
    "fatigue_load_limit_kN": 1510,
    "limiting_speed_rpm": 210,
    "max_rpm": 210,
    "speed_oil_rpm": 270,
    "weight_g": 1050000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "230/850B is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 850×1220×272 mm to ISO 15, with pressed-steel cage (standard execution). On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (cylindrical), lubrication feature (none); 230/850B is assembled exactly in that order. NTN prints two speeds for 230/850B: 210 r/min grease and 270 r/min oil — the gap of 60 r/min reflects oil cooling of the heavy roller set. Equivalent-load planning keeps a radial plus moderate axial combination on 230/850B; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 850 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 850 mm bore 230/850B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 850 mm bearing, and drive-up procedures differ.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 230/850B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 850 mm bearing, and drive-up procedures differ.",
      "Oil relubrication toward 270 r/min needs drain and level design; flooding the 272 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 10900/22700 kN ratings, 1510 kN Pu and 1050000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 230/850B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 230/850B?",
        "a": "230/850B is an NTN double-row spherical roller bearing to ISO 15: 850 mm bore, 1220 mm OD and 272 mm width (33.465 × 48.031 × 10.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 10900 kN, C0 22700 kN, Pu 1510 kN, grease limiting speed 210 r/min, oil 270 r/min, mass about 1050000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "230/850B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 230/850BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 230/850B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 230/850B?",
        "a": "230/850B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 230/850B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 10900 kN C / 22700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "230-850BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 230-850BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "230-850b",
      "230-850B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "230-850BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 230/850BK",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 850,
    "D_mm": 1220,
    "B_mm": 272,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 10900,
    "static_load_kN": 22700,
    "fatigue_load_limit_kN": 1510,
    "limiting_speed_rpm": 210,
    "max_rpm": 210,
    "speed_oil_rpm": 270,
    "weight_g": 1010000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 850 mm shaft, NTN supplies 230/850BK: sphered outer raceway, two roller rows, pressed-steel cage (standard execution), oil speed 270 r/min. Digit by digit the code reads as spherical-roller dimension series plus 850 mm bore; the 272 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. At 10900 kN C and 1010000 g mass the 23000 series part is built for shock and vibration; the 272 mm-wide ring needs square abutments to keep both rows equally loaded. Catalogue mass 1010000 g (1010.00 kg) for the 850×1220×272 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Mount 230/850BK on its adapter or withdrawal sleeve on the 850 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 850 mm bore 230/850BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 230/850BK by envelope alone: the 22700 kN C0 and 1510 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Never substitute 230/850BK by envelope alone: the 22700 kN C0 and 1510 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 230/850B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 210 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 10900/22700 kN ratings, 1510 kN Pu and 1010000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 230/850BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 230/850BK?",
        "a": "230/850BK is an NTN double-row spherical roller bearing to ISO 15: 850 mm bore, 1220 mm OD and 272 mm width (33.465 × 48.031 × 10.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 10900 kN, C0 22700 kN, Pu 1510 kN, grease limiting speed 210 r/min, oil 270 r/min, mass about 1010000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 230/850BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 230/850B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 230/850BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 230/850BK?",
        "a": "230/850BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 230/850BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 10900 kN C / 22700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "230-850B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 230-850B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "230-850bk",
      "230-850BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "240-850B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 240/850B",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 850,
    "D_mm": 1220,
    "B_mm": 365,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 13900,
    "static_load_kN": 31500,
    "fatigue_load_limit_kN": 1490,
    "limiting_speed_rpm": 180,
    "max_rpm": 180,
    "speed_oil_rpm": 240,
    "weight_g": 1410000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 240/850B denotes the 850 mm bore spherical roller bearing (13900 kN C / 31500 kN C0) in the 24000 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (24000 series); the bore code resolves to 850 mm (two-digit code ×5, with the 00–03 exception table), and 1220 mm OD / 365 mm width follow the general plan. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. The 185.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 365 mm-wide ring seats fully on both sides. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 850 mm bore 240/850B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 240/850B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Oil relubrication toward 240 r/min needs drain and level design; flooding the 365 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 13900 kN rating no longer applies.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 850 mm bearing, and drive-up procedures differ.",
      "The 13900/31500 kN ratings, 1490 kN Pu and 1410000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/850B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 240/850B?",
        "a": "240/850B is an NTN double-row spherical roller bearing to ISO 15: 850 mm bore, 1220 mm OD and 365 mm width (33.465 × 48.031 × 14.37 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 13900 kN, C0 31500 kN, Pu 1490 kN, grease limiting speed 180 r/min, oil 240 r/min, mass about 1410000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "240/850B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 240/850BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 240/850B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 240/850B?",
        "a": "240/850B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 240/850B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 13900 kN C / 31500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "240-850BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 240-850BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "240-850b",
      "240-850B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "240-850BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 240/850BK30",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 850,
    "D_mm": 1220,
    "B_mm": 365,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 13900,
    "static_load_kN": 31500,
    "fatigue_load_limit_kN": 1490,
    "limiting_speed_rpm": 180,
    "max_rpm": 180,
    "speed_oil_rpm": 240,
    "weight_g": 1390000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 240/850BK30 denotes the 850 mm bore spherical roller bearing (13900 kN C / 31500 kN C0) in the 24000 series, the self-aligning choice for heavy combined load. Digit by digit the code reads as spherical-roller dimension series plus 850 mm bore; the 365 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Suffix reading on 240/850BK30: the bare number is the standard open execution; K30 marks the 1:30 tapered bore of the wide series; B marks the standard large-bore internal design on slash-size 230–232 series; quote the full code because each suffix is a distinct article. Pu 1490 kN against C0 31500 kN anchors the contamination derating; for dirty mining duty the adjusted life of 240/850BK30 moves with cleanliness far more than with small C variations. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 850 mm bore 240/850BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 240/850BK30 carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 850×1220 mm envelope is identical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 850 mm bearing, and drive-up procedures differ.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 240/850BK30 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 365 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 13900/31500 kN ratings, 1490 kN Pu and 1390000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/850BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 240/850BK30?",
        "a": "240/850BK30 is an NTN double-row spherical roller bearing to ISO 15: 850 mm bore, 1220 mm OD and 365 mm width (33.465 × 48.031 × 14.37 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 13900 kN, C0 31500 kN, Pu 1490 kN, grease limiting speed 180 r/min, oil 240 r/min, mass about 1390000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 240/850BK30 mounts on a matching adapter or withdrawal sleeve on a plain 850 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 240/850B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 240/850BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 240/850BK30?",
        "a": "240/850BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 240/850BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 13900 kN C / 31500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "240-850B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 240-850B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "240-850bk30",
      "240-850BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "231-850B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 231/850B",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 850,
    "D_mm": 1360,
    "B_mm": 400,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 17300,
    "static_load_kN": 34000,
    "fatigue_load_limit_kN": 1380,
    "limiting_speed_rpm": 170,
    "max_rpm": 170,
    "speed_oil_rpm": 220,
    "weight_g": 2270000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "231/850B is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 850×1360×400 mm to ISO 15, with pressed-steel cage (standard execution). Digit by digit the code reads as spherical-roller dimension series plus 850 mm bore; the 400 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Equivalent-load planning keeps a radial plus moderate axial combination on 231/850B; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 850 mm set.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 850 mm bore 231/850B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 231/850B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 850 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 400 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 231/850B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 17300/34000 kN ratings, 1380 kN Pu and 2270000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 231/850B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 231/850B?",
        "a": "231/850B is an NTN double-row spherical roller bearing to ISO 15: 850 mm bore, 1360 mm OD and 400 mm width (33.465 × 53.543 × 15.748 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 17300 kN, C0 34000 kN, Pu 1380 kN, grease limiting speed 170 r/min, oil 220 r/min, mass about 2270000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "231/850B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 231/850BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 231/850B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 231/850B?",
        "a": "231/850B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 231/850B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 17300 kN C / 34000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "231-850BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 231-850BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "231-850b",
      "231-850B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "231-850BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 231/850BK",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 850,
    "D_mm": 1360,
    "B_mm": 400,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 17300,
    "static_load_kN": 34000,
    "fatigue_load_limit_kN": 1380,
    "limiting_speed_rpm": 170,
    "max_rpm": 170,
    "speed_oil_rpm": 220,
    "weight_g": 2200000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 231/850BK identifies a 850×1360×400 mm (33.465 × 53.543 × 15.748 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Numbering ties 231/850BK to its envelope and execution: same-number EA versus EM or plain variants share the 850 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Two symmetric roller rows share the load: C 17300 kN, C0 34000 kN (C0/C ≈ 1.97), with useful axial capacity in either direction alongside the dominant radial load. Grease/oil ratio: the 170 r/min limiting value is .77 of the 220 r/min oil value; heavy 400 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 850 mm set.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 850 mm bore 231/850BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 231/850BK by envelope alone: the 34000 kN C0 and 1380 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 400 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 850 mm bearing, and drive-up procedures differ.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 850 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The 17300/34000 kN ratings, 1380 kN Pu and 2200000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 231/850BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 231/850BK?",
        "a": "231/850BK is an NTN double-row spherical roller bearing to ISO 15: 850 mm bore, 1360 mm OD and 400 mm width (33.465 × 53.543 × 15.748 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 17300 kN, C0 34000 kN, Pu 1380 kN, grease limiting speed 170 r/min, oil 220 r/min, mass about 2200000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 231/850BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 231/850B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 231/850BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 231/850BK?",
        "a": "231/850BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 231/850BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 17300 kN C / 34000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "231-850B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 231-850B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "231-850bk",
      "231-850BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-900",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/900",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 900,
    "D_mm": 1180,
    "B_mm": 206,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 7400,
    "static_load_kN": 17300,
    "fatigue_load_limit_kN": 1230,
    "limiting_speed_rpm": 210,
    "max_rpm": 210,
    "speed_oil_rpm": 270,
    "weight_g": 623000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 900 mm shaft, NTN supplies 239/900: sphered outer raceway, two roller rows, pressed-steel cage (standard execution), oil speed 270 r/min. Reading the full code: the number gives the 900×1180 mm envelope, — names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and plain outer ring (no D1/W33 groove) completes the order number. Open by design, 239/900 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Pu 1230 kN against C0 17300 kN anchors the contamination derating; for dirty mining duty the adjusted life of 239/900 moves with cleanliness far more than with small C variations. Fit the cylindrical-bore 239/900 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 900 mm bore 239/900 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 900 mm bearing, and drive-up procedures differ.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 206 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 239/900 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 7400 kN rating no longer applies.",
      "The 7400/17300 kN ratings, 1230 kN Pu and 623000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/900 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/900?",
        "a": "239/900 is an NTN double-row spherical roller bearing to ISO 15: 900 mm bore, 1180 mm OD and 206 mm width (35.433 × 46.457 × 8.11 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 7400 kN, C0 17300 kN, Pu 1230 kN, grease limiting speed 210 r/min, oil 270 r/min, mass about 623000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "239/900 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 239/900K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/900 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/900?",
        "a": "239/900 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/900 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 7400 kN C / 17300 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-900K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 239-900K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-900"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-900K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/900K",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 900,
    "D_mm": 1180,
    "B_mm": 206,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 7400,
    "static_load_kN": 17300,
    "fatigue_load_limit_kN": 1230,
    "limiting_speed_rpm": 210,
    "max_rpm": 210,
    "speed_oil_rpm": 270,
    "weight_g": 603000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 239/900K identifies a 900×1180×206 mm (35.433 × 46.457 × 8.11 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (K), lubrication feature (none); 239/900K is assembled exactly in that order. Open by design, 239/900K requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Equivalent-load planning keeps a radial plus moderate axial combination on 239/900K; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 239/900K leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 900 mm bore 239/900K is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 270 r/min needs drain and level design; flooding the 206 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 900 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Oil relubrication toward 270 r/min needs drain and level design; flooding the 206 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 7400 kN rating no longer applies.",
      "The 7400/17300 kN ratings, 1230 kN Pu and 603000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/900K (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/900K?",
        "a": "239/900K is an NTN double-row spherical roller bearing to ISO 15: 900 mm bore, 1180 mm OD and 206 mm width (35.433 × 46.457 × 8.11 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 7400 kN, C0 17300 kN, Pu 1230 kN, grease limiting speed 210 r/min, oil 270 r/min, mass about 603000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 239/900K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 239/900."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/900K is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/900K?",
        "a": "239/900K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/900K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 7400 kN C / 17300 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-900",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 239-900 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-900k",
      "239-900K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "230-900B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 230/900B",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 900,
    "D_mm": 1280,
    "B_mm": 280,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 11400,
    "static_load_kN": 24700,
    "fatigue_load_limit_kN": 1580,
    "limiting_speed_rpm": 190,
    "max_rpm": 190,
    "speed_oil_rpm": 250,
    "weight_g": 1170000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 230/900B with a cylindrical bore and plain outer ring (no D1/W33 groove): 900 mm bore, 1280 mm OD, 280 mm width, rated 190 r/min on grease. Numbering ties 230/900B to its envelope and execution: same-number EA versus EM or plain variants share the 900 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. At 11400 kN C and 1170000 g mass the 23000 series part is built for shock and vibration; the 280 mm-wide ring needs square abutments to keep both rows equally loaded. With about 12.7 kN of C per millimetre of the 900 mm bore, 230/900B screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Fillet radii on shaft and housing must clear the ring chamfers of the 280 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 900 mm bore 230/900B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 280 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 230/900B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 11400 kN rating no longer applies.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 190 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 11400/24700 kN ratings, 1580 kN Pu and 1170000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 230/900B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 230/900B?",
        "a": "230/900B is an NTN double-row spherical roller bearing to ISO 15: 900 mm bore, 1280 mm OD and 280 mm width (35.433 × 50.394 × 11.024 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 11400 kN, C0 24700 kN, Pu 1580 kN, grease limiting speed 190 r/min, oil 250 r/min, mass about 1170000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "230/900B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 230/900BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 230/900B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 230/900B?",
        "a": "230/900B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 230/900B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 11400 kN C / 24700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "230-900BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 230-900BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "230-900b",
      "230-900B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "230-900BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 230/900BK",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 900,
    "D_mm": 1280,
    "B_mm": 280,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 11400,
    "static_load_kN": 24700,
    "fatigue_load_limit_kN": 1580,
    "limiting_speed_rpm": 190,
    "max_rpm": 190,
    "speed_oil_rpm": 250,
    "weight_g": 1130000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 230/900BK denotes the 900 mm bore spherical roller bearing (11400 kN C / 24700 kN C0) in the 23000 series, the self-aligning choice for heavy combined load. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (K), lubrication feature (none); 230/900BK is assembled exactly in that order. NTN prints two speeds for 230/900BK: 190 r/min grease and 250 r/min oil — the gap of 60 r/min reflects oil cooling of the heavy roller set. Speed planning: 190 r/min grease limiting speed is the cage/kinematic ceiling and 250 r/min is the oil-lubricated value for the 900 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 900 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 900 mm bore 230/900BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 250 r/min needs drain and level design; flooding the 280 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Oil relubrication toward 250 r/min needs drain and level design; flooding the 280 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 900 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Oil relubrication toward 250 r/min needs drain and level design; flooding the 280 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 11400/24700 kN ratings, 1580 kN Pu and 1130000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 230/900BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 230/900BK?",
        "a": "230/900BK is an NTN double-row spherical roller bearing to ISO 15: 900 mm bore, 1280 mm OD and 280 mm width (35.433 × 50.394 × 11.024 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 11400 kN, C0 24700 kN, Pu 1580 kN, grease limiting speed 190 r/min, oil 250 r/min, mass about 1130000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 230/900BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 230/900B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 230/900BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 230/900BK?",
        "a": "230/900BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 230/900BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 11400 kN C / 24700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "230-900B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 230-900B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "230-900bk",
      "230-900BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "240-900B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 240/900B",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 900,
    "D_mm": 1280,
    "B_mm": 375,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 14700,
    "static_load_kN": 33500,
    "fatigue_load_limit_kN": 1580,
    "limiting_speed_rpm": 170,
    "max_rpm": 170,
    "speed_oil_rpm": 220,
    "weight_g": 1570000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 240/900B denotes the 900 mm bore spherical roller bearing (14700 kN C / 33500 kN C0) in the 24000 series, the self-aligning choice for heavy combined load. Digit by digit the code reads as spherical-roller dimension series plus 900 mm bore; the 375 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. NTN prints two speeds for 240/900B: 170 r/min grease and 220 r/min oil — the gap of 50 r/min reflects oil cooling of the heavy roller set. Grease/oil ratio: the 170 r/min limiting value is .77 of the 220 r/min oil value; heavy 375 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Fit the cylindrical-bore 240/900B with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 900 mm bore 240/900B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 900 mm bearing, and drive-up procedures differ.",
      "Do not confuse EA and EM at the same number: 240/900B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 900×1280 mm envelope is identical.",
      "Never substitute 240/900B by envelope alone: the 33500 kN C0 and 1580 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Oil relubrication toward 220 r/min needs drain and level design; flooding the 375 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 14700/33500 kN ratings, 1580 kN Pu and 1570000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/900B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 240/900B?",
        "a": "240/900B is an NTN double-row spherical roller bearing to ISO 15: 900 mm bore, 1280 mm OD and 375 mm width (35.433 × 50.394 × 14.764 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 14700 kN, C0 33500 kN, Pu 1580 kN, grease limiting speed 170 r/min, oil 220 r/min, mass about 1570000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "240/900B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 240/900BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 240/900B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 240/900B?",
        "a": "240/900B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 240/900B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 14700 kN C / 33500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "240-900BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 240-900BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "240-900b",
      "240-900B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "240-900BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 240/900BK30",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 900,
    "D_mm": 1280,
    "B_mm": 375,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 14700,
    "static_load_kN": 33500,
    "fatigue_load_limit_kN": 1580,
    "limiting_speed_rpm": 170,
    "max_rpm": 170,
    "speed_oil_rpm": 220,
    "weight_g": 1540000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 900 mm shaft, NTN supplies 240/900BK30: sphered outer raceway, two roller rows, pressed-steel cage (standard execution), oil speed 220 r/min. Digit by digit the code reads as spherical-roller dimension series plus 900 mm bore; the 375 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. The 190.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 375 mm-wide ring seats fully on both sides. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 900 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 900 mm bore 240/900BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 240/900BK30 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 240/900BK30 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 240/900BK30 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 240/900BK30 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 14700/33500 kN ratings, 1580 kN Pu and 1540000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/900BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 240/900BK30?",
        "a": "240/900BK30 is an NTN double-row spherical roller bearing to ISO 15: 900 mm bore, 1280 mm OD and 375 mm width (35.433 × 50.394 × 14.764 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 14700 kN, C0 33500 kN, Pu 1580 kN, grease limiting speed 170 r/min, oil 220 r/min, mass about 1540000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 240/900BK30 mounts on a matching adapter or withdrawal sleeve on a plain 900 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 240/900B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 240/900BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 240/900BK30?",
        "a": "240/900BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 240/900BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 14700 kN C / 33500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "240-900B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 240-900B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "240-900bk30",
      "240-900BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "231-900B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 231/900B",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 900,
    "D_mm": 1420,
    "B_mm": 412,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 18700,
    "static_load_kN": 38000,
    "fatigue_load_limit_kN": 2030,
    "limiting_speed_rpm": 150,
    "max_rpm": 150,
    "speed_oil_rpm": 200,
    "weight_g": 2500000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "231/900B is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 900×1420×412 mm to ISO 15, with pressed-steel cage (standard execution). Digit by digit the code reads as spherical-roller dimension series plus 900 mm bore; the 412 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the basic cage. Catalogue mass 2500000 g (2500.00 kg) for the 900×1420×412 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Fillet radii on shaft and housing must clear the ring chamfers of the 412 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 900 mm bore 231/900B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 231/900B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The cylindrical-bore 231/900B and its tapered-bore counterpart 231/900BK share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 231/900B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Never substitute 231/900B by envelope alone: the 38000 kN C0 and 2030 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The 18700/38000 kN ratings, 2030 kN Pu and 2500000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 231/900B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 231/900B?",
        "a": "231/900B is an NTN double-row spherical roller bearing to ISO 15: 900 mm bore, 1420 mm OD and 412 mm width (35.433 × 55.906 × 16.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 18700 kN, C0 38000 kN, Pu 2030 kN, grease limiting speed 150 r/min, oil 200 r/min, mass about 2500000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "231/900B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 231/900BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 231/900B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 231/900B?",
        "a": "231/900B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 231/900B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 18700 kN C / 38000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "231-900BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 231-900BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "231-900b",
      "231-900B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "231-900BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 231/900BK",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 900,
    "D_mm": 1420,
    "B_mm": 412,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 18700,
    "static_load_kN": 38000,
    "fatigue_load_limit_kN": 2030,
    "limiting_speed_rpm": 150,
    "max_rpm": 150,
    "speed_oil_rpm": 200,
    "weight_g": 2420000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "231/900BK is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 900×1420×412 mm to ISO 15, with pressed-steel cage (standard execution). The leading digits are the ISO 15 dimension series (23100 series); the bore code resolves to 900 mm (two-digit code ×5, with the 00–03 exception table), and 1420 mm OD / 412 mm width follow the general plan. Two symmetric roller rows share the load: C 18700 kN, C0 38000 kN (C0/C ≈ 2.03), with useful axial capacity in either direction alongside the dominant radial load. Pu 2030 kN against C0 38000 kN anchors the contamination derating; for dirty mining duty the adjusted life of 231/900BK moves with cleanliness far more than with small C variations. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 231/900BK leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 900 mm bore 231/900BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 231/900BK by envelope alone: the 38000 kN C0 and 2030 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 231/900BK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 231/900B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 900 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The 18700/38000 kN ratings, 2030 kN Pu and 2420000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 231/900BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 231/900BK?",
        "a": "231/900BK is an NTN double-row spherical roller bearing to ISO 15: 900 mm bore, 1420 mm OD and 412 mm width (35.433 × 55.906 × 16.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 18700 kN, C0 38000 kN, Pu 2030 kN, grease limiting speed 150 r/min, oil 200 r/min, mass about 2420000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 231/900BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 231/900B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 231/900BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 231/900BK?",
        "a": "231/900BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 231/900BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 18700 kN C / 38000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "231-900B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 231-900B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "231-900bk",
      "231-900BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-950",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/950",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 950,
    "D_mm": 1250,
    "B_mm": 224,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 8650,
    "static_load_kN": 20500,
    "fatigue_load_limit_kN": 1390,
    "limiting_speed_rpm": 190,
    "max_rpm": 190,
    "speed_oil_rpm": 250,
    "weight_g": 774000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 239/950 identifies a 950×1250×224 mm (37.402 × 49.213 × 8.819 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Reading the full code: the number gives the 950×1250 mm envelope, — names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and plain outer ring (no D1/W33 groove) completes the order number. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Equivalent-load planning keeps a radial plus moderate axial combination on 239/950; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 950 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 950 mm bore 239/950 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 950 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 239/950 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 950 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 239/950 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 8650/20500 kN ratings, 1390 kN Pu and 774000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/950 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/950?",
        "a": "239/950 is an NTN double-row spherical roller bearing to ISO 15: 950 mm bore, 1250 mm OD and 224 mm width (37.402 × 49.213 × 8.819 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 8650 kN, C0 20500 kN, Pu 1390 kN, grease limiting speed 190 r/min, oil 250 r/min, mass about 774000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "239/950 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 239/950K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/950 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/950?",
        "a": "239/950 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/950 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 8650 kN C / 20500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-950K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 239-950K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-950"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-950K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/950K",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 950,
    "D_mm": 1250,
    "B_mm": 224,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 8650,
    "static_load_kN": 20500,
    "fatigue_load_limit_kN": 1390,
    "limiting_speed_rpm": 190,
    "max_rpm": 190,
    "speed_oil_rpm": 250,
    "weight_g": 749000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 239/950K denotes the 950 mm bore spherical roller bearing (8650 kN C / 20500 kN C0) in the 23900 series, the self-aligning choice for heavy combined load. Reading the full code: the number gives the 950×1250 mm envelope, — names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. At 8650 kN C and 749000 g mass the 23900 series part is built for shock and vibration; the 224 mm-wide ring needs square abutments to keep both rows equally loaded. With about 9.1 kN of C per millimetre of the 950 mm bore, 239/950K screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 950 mm bore 239/950K is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 239/950: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 224 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 224 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 190 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 8650/20500 kN ratings, 1390 kN Pu and 749000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/950K (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/950K?",
        "a": "239/950K is an NTN double-row spherical roller bearing to ISO 15: 950 mm bore, 1250 mm OD and 224 mm width (37.402 × 49.213 × 8.819 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 8650 kN, C0 20500 kN, Pu 1390 kN, grease limiting speed 190 r/min, oil 250 r/min, mass about 749000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 239/950K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 239/950."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/950K is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/950K?",
        "a": "239/950K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/950K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 8650 kN C / 20500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-950",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 239-950 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-950k",
      "239-950K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "230-950B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 230/950B",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 950,
    "D_mm": 1360,
    "B_mm": 300,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 12800,
    "static_load_kN": 28400,
    "fatigue_load_limit_kN": 1750,
    "limiting_speed_rpm": 180,
    "max_rpm": 180,
    "speed_oil_rpm": 230,
    "weight_g": 1430000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 230/950B identifies a 950×1360×300 mm (37.402 × 53.543 × 11.811 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Reading the full code: the number gives the 950×1360 mm envelope, — names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and plain outer ring (no D1/W33 groove) completes the order number. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Selection: the C0/C ratio of 2.22 (28400/12800 kN) reflects the heavy static and shock proportioning of 230/950B; size the equivalent load at the required L10 with shock factor for the application. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 950 mm bore 230/950B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 230/950B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Do not confuse EA and EM at the same number: 230/950B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 950×1360 mm envelope is identical.",
      "The cylindrical-bore 230/950B and its tapered-bore counterpart 230/950BK share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 950 mm bearing, and drive-up procedures differ.",
      "The 12800/28400 kN ratings, 1750 kN Pu and 1430000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 230/950B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 230/950B?",
        "a": "230/950B is an NTN double-row spherical roller bearing to ISO 15: 950 mm bore, 1360 mm OD and 300 mm width (37.402 × 53.543 × 11.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 12800 kN, C0 28400 kN, Pu 1750 kN, grease limiting speed 180 r/min, oil 230 r/min, mass about 1430000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "230/950B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 230/950BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 230/950B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 230/950B?",
        "a": "230/950B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 230/950B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 12800 kN C / 28400 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "230-950BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 230-950BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "230-950b",
      "230-950B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "230-950BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 230/950BK",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 950,
    "D_mm": 1360,
    "B_mm": 300,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 12800,
    "static_load_kN": 28400,
    "fatigue_load_limit_kN": 1750,
    "limiting_speed_rpm": 180,
    "max_rpm": 180,
    "speed_oil_rpm": 230,
    "weight_g": 1380000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 230/950BK identifies a 950×1360×300 mm (37.402 × 53.543 × 11.811 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (K), lubrication feature (none); 230/950BK is assembled exactly in that order. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Catalogue mass 1380000 g (1380.00 kg) for the 950×1360×300 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 950 mm set.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 950 mm bore 230/950BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 12800 kN rating no longer applies.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 230/950BK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 950 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 230/950BK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 12800/28400 kN ratings, 1750 kN Pu and 1380000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 230/950BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 230/950BK?",
        "a": "230/950BK is an NTN double-row spherical roller bearing to ISO 15: 950 mm bore, 1360 mm OD and 300 mm width (37.402 × 53.543 × 11.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 12800 kN, C0 28400 kN, Pu 1750 kN, grease limiting speed 180 r/min, oil 230 r/min, mass about 1380000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 230/950BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 230/950B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 230/950BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 230/950BK?",
        "a": "230/950BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 230/950BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 12800 kN C / 28400 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "230-950B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 230-950B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "230-950bk",
      "230-950BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "240-950B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 240/950B",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 950,
    "D_mm": 1360,
    "B_mm": 412,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 17200,
    "static_load_kN": 40000,
    "fatigue_load_limit_kN": 1780,
    "limiting_speed_rpm": 160,
    "max_rpm": 160,
    "speed_oil_rpm": 210,
    "weight_g": 1970000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "240/950B belongs to the 24000 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. Numbering ties 240/950B to its envelope and execution: same-number EA versus EM or plain variants share the 950 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. NTN prints two speeds for 240/950B: 160 r/min grease and 210 r/min oil — the gap of 50 r/min reflects oil cooling of the heavy roller set. Pu 1780 kN against C0 40000 kN anchors the contamination derating; for dirty mining duty the adjusted life of 240/950B moves with cleanliness far more than with small C variations. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 950 mm bore 240/950B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 950 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 240/950B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Do not confuse EA and EM at the same number: 240/950B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 950×1360 mm envelope is identical.",
      "Oil relubrication toward 210 r/min needs drain and level design; flooding the 412 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 17200/40000 kN ratings, 1780 kN Pu and 1970000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/950B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 240/950B?",
        "a": "240/950B is an NTN double-row spherical roller bearing to ISO 15: 950 mm bore, 1360 mm OD and 412 mm width (37.402 × 53.543 × 16.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 17200 kN, C0 40000 kN, Pu 1780 kN, grease limiting speed 160 r/min, oil 210 r/min, mass about 1970000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "240/950B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 240/950BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 240/950B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 240/950B?",
        "a": "240/950B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 240/950B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 17200 kN C / 40000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "240-950BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 240-950BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "240-950b",
      "240-950B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "240-950BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 240/950BK30",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 950,
    "D_mm": 1360,
    "B_mm": 412,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 17200,
    "static_load_kN": 40000,
    "fatigue_load_limit_kN": 1780,
    "limiting_speed_rpm": 160,
    "max_rpm": 160,
    "speed_oil_rpm": 210,
    "weight_g": 1940000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "240/950BK30 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 950×1360×412 mm to ISO 15, with pressed-steel cage (standard execution). On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (K30), lubrication feature (none); 240/950BK30 is assembled exactly in that order. The 205.0 mm radial section over the 950 mm bore carries two roller rows; capacity per millimetre of bore is about 18.1 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. With about 18.1 kN of C per millimetre of the 950 mm bore, 240/950BK30 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 240/950BK30 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 950 mm bore 240/950BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 412 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 240/950B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 950 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 240/950B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 17200/40000 kN ratings, 1780 kN Pu and 1940000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/950BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 240/950BK30?",
        "a": "240/950BK30 is an NTN double-row spherical roller bearing to ISO 15: 950 mm bore, 1360 mm OD and 412 mm width (37.402 × 53.543 × 16.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 17200 kN, C0 40000 kN, Pu 1780 kN, grease limiting speed 160 r/min, oil 210 r/min, mass about 1940000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 240/950BK30 mounts on a matching adapter or withdrawal sleeve on a plain 950 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 240/950B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 240/950BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 240/950BK30?",
        "a": "240/950BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 240/950BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 17200 kN C / 40000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "240-950B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 240-950B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "240-950bk30",
      "240-950BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-1000",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/1000",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 1000,
    "D_mm": 1320,
    "B_mm": 236,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 9550,
    "static_load_kN": 22700,
    "fatigue_load_limit_kN": 1520,
    "limiting_speed_rpm": 180,
    "max_rpm": 180,
    "speed_oil_rpm": 230,
    "weight_g": 916000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 239/1000 denotes the 1000 mm bore spherical roller bearing (9550 kN C / 22700 kN C0) in the 23900 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 1000 mm (two-digit code ×5, with the 00–03 exception table), and 1320 mm OD / 236 mm width follow the general plan. Suffix reading on 239/1000: the bare number is the standard open execution; quote the full code because each suffix is a distinct article. Grease/oil ratio: the 180 r/min limiting value is .78 of the 230 r/min oil value; heavy 236 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Never mount 239/1000 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 1320 mm race.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 1000 mm bore 239/1000 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 239/1000 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Never substitute 239/1000 by envelope alone: the 22700 kN C0 and 1520 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 1000 mm bearing, and drive-up procedures differ.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 236 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 9550/22700 kN ratings, 1520 kN Pu and 916000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/1000 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/1000?",
        "a": "239/1000 is an NTN double-row spherical roller bearing to ISO 15: 1000 mm bore, 1320 mm OD and 236 mm width (39.37 × 51.969 × 9.291 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 9550 kN, C0 22700 kN, Pu 1520 kN, grease limiting speed 180 r/min, oil 230 r/min, mass about 916000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "239/1000 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 239/1000K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/1000 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/1000?",
        "a": "239/1000 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/1000 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 9550 kN C / 22700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-1000K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 239-1000K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=217",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-1000"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-1000K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/1000K",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 1000,
    "D_mm": 1320,
    "B_mm": 236,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 9550,
    "static_load_kN": 22700,
    "fatigue_load_limit_kN": 1520,
    "limiting_speed_rpm": 180,
    "max_rpm": 180,
    "speed_oil_rpm": 230,
    "weight_g": 887000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 1000 mm shaft, NTN supplies 239/1000K: sphered outer raceway, two roller rows, pressed-steel cage (standard execution), oil speed 230 r/min. Numbering ties 239/1000K to its envelope and execution: same-number EA versus EM or plain variants share the 1000 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. At 9550 kN C and 887000 g mass the 23900 series part is built for shock and vibration; the 236 mm-wide ring needs square abutments to keep both rows equally loaded. 1000 mm bore is 39.37 in and 1320 mm OD is 51.969 in; the ISO 15 envelope swaps between brands, but the 9550/22700 kN ratings and cage design are NTN 2203E values. Mount 239/1000K on its adapter or withdrawal sleeve on the 1000 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 1000 mm bore 239/1000K is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 236 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 236 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 236 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 180 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 9550/22700 kN ratings, 1520 kN Pu and 887000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/1000K (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/1000K?",
        "a": "239/1000K is an NTN double-row spherical roller bearing to ISO 15: 1000 mm bore, 1320 mm OD and 236 mm width (39.37 × 51.969 × 9.291 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 9550 kN, C0 22700 kN, Pu 1520 kN, grease limiting speed 180 r/min, oil 230 r/min, mass about 887000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 239/1000K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 239/1000."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/1000K is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/1000K?",
        "a": "239/1000K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/1000K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 9550 kN C / 22700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-1000",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 239-1000 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=217",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-1000k",
      "239-1000K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "230-1000B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 230/1000B",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 1000,
    "D_mm": 1420,
    "B_mm": 308,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 13800,
    "static_load_kN": 30000,
    "fatigue_load_limit_kN": 1460,
    "limiting_speed_rpm": 170,
    "max_rpm": 170,
    "speed_oil_rpm": 220,
    "weight_g": 1580000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "230/1000B belongs to the 23000 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. Numbering ties 230/1000B to its envelope and execution: same-number EA versus EM or plain variants share the 1000 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Pu 1460 kN is the catalogue fatigue load limit for 230/1000B, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Equivalent-load planning keeps a radial plus moderate axial combination on 230/1000B; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Fillet radii on shaft and housing must clear the ring chamfers of the 308 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 1000 mm bore 230/1000B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 230/1000B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 1000×1420 mm envelope is identical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 230/1000B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 1000 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 230/1000B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 13800/30000 kN ratings, 1460 kN Pu and 1580000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 230/1000B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 230/1000B?",
        "a": "230/1000B is an NTN double-row spherical roller bearing to ISO 15: 1000 mm bore, 1420 mm OD and 308 mm width (39.37 × 55.906 × 12.126 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 13800 kN, C0 30000 kN, Pu 1460 kN, grease limiting speed 170 r/min, oil 220 r/min, mass about 1580000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "230/1000B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 230/1000BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 230/1000B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 230/1000B?",
        "a": "230/1000B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 230/1000B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 13800 kN C / 30000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "230-1000BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 230-1000BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=217",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "230-1000b",
      "230-1000B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "230-1000BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 230/1000BK",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 1000,
    "D_mm": 1420,
    "B_mm": 308,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 13800,
    "static_load_kN": 30000,
    "fatigue_load_limit_kN": 1460,
    "limiting_speed_rpm": 170,
    "max_rpm": 170,
    "speed_oil_rpm": 220,
    "weight_g": 1520000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 230/1000BK with a 1:12 tapered bore (K) and plain outer ring (no D1/W33 groove): 1000 mm bore, 1420 mm OD, 308 mm width, rated 170 r/min on grease. Digit by digit the code reads as spherical-roller dimension series plus 1000 mm bore; the 308 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Suffix reading on 230/1000BK: the bare number is the standard open execution; K marks the 1:12 tapered bore; B marks the standard large-bore internal design on slash-size 230–232 series; quote the full code because each suffix is a distinct article. 1000 mm bore is 39.37 in and 1420 mm OD is 55.906 in; the ISO 15 envelope swaps between brands, but the 13800/30000 kN ratings and cage design are NTN 2203E values. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 1000 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 1000 mm bore 230/1000BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 13800 kN rating no longer applies.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 1000 mm bearing, and drive-up procedures differ.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 230/1000BK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 308 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 13800/30000 kN ratings, 1460 kN Pu and 1520000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 230/1000BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 230/1000BK?",
        "a": "230/1000BK is an NTN double-row spherical roller bearing to ISO 15: 1000 mm bore, 1420 mm OD and 308 mm width (39.37 × 55.906 × 12.126 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 13800 kN, C0 30000 kN, Pu 1460 kN, grease limiting speed 170 r/min, oil 220 r/min, mass about 1520000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 230/1000BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 230/1000B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 230/1000BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 230/1000BK?",
        "a": "230/1000BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 230/1000BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 13800 kN C / 30000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "230-1000B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 230-1000B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=217",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "230-1000bk",
      "230-1000BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "240-1000B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 240/1000B",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 1000,
    "D_mm": 1420,
    "B_mm": 412,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 17800,
    "static_load_kN": 42000,
    "fatigue_load_limit_kN": 1890,
    "limiting_speed_rpm": 150,
    "max_rpm": 150,
    "speed_oil_rpm": 190,
    "weight_g": 2110000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 240/1000B denotes the 1000 mm bore spherical roller bearing (17800 kN C / 42000 kN C0) in the 24000 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (24000 series); the bore code resolves to 1000 mm (two-digit code ×5, with the 00–03 exception table), and 1420 mm OD / 412 mm width follow the general plan. Open by design, 240/1000B requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. 1000 mm bore is 39.37 in and 1420 mm OD is 55.906 in; the ISO 15 envelope swaps between brands, but the 17800/42000 kN ratings and cage design are NTN 2203E values. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 1000 mm bore 240/1000B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 1000 mm bearing, and drive-up procedures differ.",
      "Oil relubrication toward 190 r/min needs drain and level design; flooding the 412 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 240/1000B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 17800 kN rating no longer applies.",
      "The 17800/42000 kN ratings, 1890 kN Pu and 2110000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/1000B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 240/1000B?",
        "a": "240/1000B is an NTN double-row spherical roller bearing to ISO 15: 1000 mm bore, 1420 mm OD and 412 mm width (39.37 × 55.906 × 16.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 17800 kN, C0 42000 kN, Pu 1890 kN, grease limiting speed 150 r/min, oil 190 r/min, mass about 2110000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "240/1000B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 240/1000BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 240/1000B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 240/1000B?",
        "a": "240/1000B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 240/1000B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 17800 kN C / 42000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "240-1000BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 240-1000BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=217",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "240-1000b",
      "240-1000B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "240-1000BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 240/1000BK30",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 1000,
    "D_mm": 1420,
    "B_mm": 412,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 17800,
    "static_load_kN": 42000,
    "fatigue_load_limit_kN": 1890,
    "limiting_speed_rpm": 150,
    "max_rpm": 150,
    "speed_oil_rpm": 190,
    "weight_g": 2080000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "240/1000BK30 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 1000×1420×412 mm to ISO 15, with pressed-steel cage (standard execution). The leading digits are the ISO 15 dimension series (24000 series); the bore code resolves to 1000 mm (two-digit code ×5, with the 00–03 exception table), and 1420 mm OD / 412 mm width follow the general plan. Suffix reading on 240/1000BK30: the bare number is the standard open execution; K30 marks the 1:30 tapered bore of the wide series; B marks the standard large-bore internal design on slash-size 230–232 series; quote the full code because each suffix is a distinct article. Catalogue mass 2080000 g (2080.00 kg) for the 1000×1420×412 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 1000 mm set.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 1000 mm bore 240/1000BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 240/1000B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Never substitute 240/1000BK30 by envelope alone: the 42000 kN C0 and 1890 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 1000 mm bearing, and drive-up procedures differ.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 412 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 17800/42000 kN ratings, 1890 kN Pu and 2080000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/1000BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 240/1000BK30?",
        "a": "240/1000BK30 is an NTN double-row spherical roller bearing to ISO 15: 1000 mm bore, 1420 mm OD and 412 mm width (39.37 × 55.906 × 16.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 17800 kN, C0 42000 kN, Pu 1890 kN, grease limiting speed 150 r/min, oil 190 r/min, mass about 2080000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 240/1000BK30 mounts on a matching adapter or withdrawal sleeve on a plain 1000 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 240/1000B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 240/1000BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 240/1000BK30?",
        "a": "240/1000BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 240/1000BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 17800 kN C / 42000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "240-1000B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 240-1000B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=217",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "240-1000bk30",
      "240-1000BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-1060",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/1060",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 1060,
    "D_mm": 1400,
    "B_mm": 250,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 10400,
    "static_load_kN": 24700,
    "fatigue_load_limit_kN": 1670,
    "limiting_speed_rpm": 160,
    "max_rpm": 160,
    "speed_oil_rpm": 210,
    "weight_g": 1090000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 239/1060 identifies a 1060×1400×250 mm (41.732 × 55.118 × 9.843 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 1060 mm bore; the 250 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Pu 1670 kN is the catalogue fatigue load limit for 239/1060, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Catalogue mass 1090000 g (1090.00 kg) for the 1060×1400×250 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 1060 mm set.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 1060 mm bore 239/1060 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 250 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 10400 kN rating no longer applies.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 250 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 239/1060 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 10400/24700 kN ratings, 1670 kN Pu and 1090000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/1060 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/1060?",
        "a": "239/1060 is an NTN double-row spherical roller bearing to ISO 15: 1060 mm bore, 1400 mm OD and 250 mm width (41.732 × 55.118 × 9.843 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 10400 kN, C0 24700 kN, Pu 1670 kN, grease limiting speed 160 r/min, oil 210 r/min, mass about 1090000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "239/1060 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 239/1060K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/1060 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/1060?",
        "a": "239/1060 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/1060 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 10400 kN C / 24700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-1060K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 239-1060K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=217",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-1060"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-1060K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/1060K",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 1060,
    "D_mm": 1400,
    "B_mm": 250,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 10400,
    "static_load_kN": 24700,
    "fatigue_load_limit_kN": 1670,
    "limiting_speed_rpm": 160,
    "max_rpm": 160,
    "speed_oil_rpm": 210,
    "weight_g": 1060000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 239/1060K with a 1:12 tapered bore (K) and plain outer ring (no D1/W33 groove): 1060 mm bore, 1400 mm OD, 250 mm width, rated 160 r/min on grease. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 1060 mm (two-digit code ×5, with the 00–03 exception table), and 1400 mm OD / 250 mm width follow the general plan. Suffix reading on 239/1060K: the bare number is the standard open execution; K marks the 1:12 tapered bore; quote the full code because each suffix is a distinct article. Grease/oil ratio: the 160 r/min limiting value is .76 of the 210 r/min oil value; heavy 250 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Fillet radii on shaft and housing must clear the ring chamfers of the 250 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 1060 mm bore 239/1060K is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 250 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 1060 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Never substitute 239/1060K by envelope alone: the 24700 kN C0 and 1670 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 250 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 10400/24700 kN ratings, 1670 kN Pu and 1060000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/1060K (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/1060K?",
        "a": "239/1060K is an NTN double-row spherical roller bearing to ISO 15: 1060 mm bore, 1400 mm OD and 250 mm width (41.732 × 55.118 × 9.843 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 10400 kN, C0 24700 kN, Pu 1670 kN, grease limiting speed 160 r/min, oil 210 r/min, mass about 1060000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 239/1060K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 239/1060."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/1060K is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/1060K?",
        "a": "239/1060K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/1060K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 10400 kN C / 24700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-1060",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 239-1060 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=217",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-1060k",
      "239-1060K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "230-1060B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 230/1060B",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 1060,
    "D_mm": 1500,
    "B_mm": 325,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 15100,
    "static_load_kN": 33500,
    "fatigue_load_limit_kN": 1610,
    "limiting_speed_rpm": 150,
    "max_rpm": 150,
    "speed_oil_rpm": 200,
    "weight_g": 1850000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 1060 mm shaft, NTN supplies 230/1060B: sphered outer raceway, two roller rows, pressed-steel cage (standard execution), oil speed 200 r/min. Numbering ties 230/1060B to its envelope and execution: same-number EA versus EM or plain variants share the 1060 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Open by design, 230/1060B requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Grease/oil ratio: the 150 r/min limiting value is .75 of the 200 r/min oil value; heavy 325 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Never mount 230/1060B by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 1500 mm race.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 1060 mm bore 230/1060B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 325 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 230/1060B by envelope alone: the 33500 kN C0 and 1610 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 325 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 15100 kN rating no longer applies.",
      "The 15100/33500 kN ratings, 1610 kN Pu and 1850000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 230/1060B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 230/1060B?",
        "a": "230/1060B is an NTN double-row spherical roller bearing to ISO 15: 1060 mm bore, 1500 mm OD and 325 mm width (41.732 × 59.055 × 12.795 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 15100 kN, C0 33500 kN, Pu 1610 kN, grease limiting speed 150 r/min, oil 200 r/min, mass about 1850000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "230/1060B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 230/1060BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 230/1060B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 230/1060B?",
        "a": "230/1060B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 230/1060B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 15100 kN C / 33500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "230-1060BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 230-1060BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=217",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "230-1060b",
      "230-1060B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "230-1060BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 230/1060BK",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 1060,
    "D_mm": 1500,
    "B_mm": 325,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 15100,
    "static_load_kN": 33500,
    "fatigue_load_limit_kN": 1610,
    "limiting_speed_rpm": 150,
    "max_rpm": 150,
    "speed_oil_rpm": 200,
    "weight_g": 1790000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 1060 mm shaft, NTN supplies 230/1060BK: sphered outer raceway, two roller rows, pressed-steel cage (standard execution), oil speed 200 r/min. The leading digits are the ISO 15 dimension series (23000 series); the bore code resolves to 1060 mm (two-digit code ×5, with the 00–03 exception table), and 1500 mm OD / 325 mm width follow the general plan. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Speed planning: 150 r/min grease limiting speed is the cage/kinematic ceiling and 200 r/min is the oil-lubricated value for the 1060 mm bore; vibrating screens rarely approach either and are load/cage limited instead. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 1060 mm set.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 1060 mm bore 230/1060BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 200 r/min needs drain and level design; flooding the 325 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 15100 kN rating no longer applies.",
      "Never substitute 230/1060BK by envelope alone: the 33500 kN C0 and 1610 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 1060 mm bearing, and drive-up procedures differ.",
      "The 15100/33500 kN ratings, 1610 kN Pu and 1790000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 230/1060BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 230/1060BK?",
        "a": "230/1060BK is an NTN double-row spherical roller bearing to ISO 15: 1060 mm bore, 1500 mm OD and 325 mm width (41.732 × 59.055 × 12.795 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 15100 kN, C0 33500 kN, Pu 1610 kN, grease limiting speed 150 r/min, oil 200 r/min, mass about 1790000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 230/1060BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 230/1060B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 230/1060BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 230/1060BK?",
        "a": "230/1060BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 230/1060BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 15100 kN C / 33500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "230-1060B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 230-1060B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=217",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "230-1060bk",
      "230-1060BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "240-1060B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 240/1060B",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 1060,
    "D_mm": 1500,
    "B_mm": 438,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 19800,
    "static_load_kN": 47000,
    "fatigue_load_limit_kN": 2060,
    "limiting_speed_rpm": 140,
    "max_rpm": 140,
    "speed_oil_rpm": 180,
    "weight_g": 2450000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "240/1060B belongs to the 24000 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. Digit by digit the code reads as spherical-roller dimension series plus 1060 mm bore; the 438 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the basic cage. Grease/oil ratio: the 140 r/min limiting value is .78 of the 180 r/min oil value; heavy 438 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 1060 mm set.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 1060 mm bore 240/1060B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 1060 mm bearing, and drive-up procedures differ.",
      "Do not confuse EA and EM at the same number: 240/1060B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 1060×1500 mm envelope is identical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 140 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Never substitute 240/1060B by envelope alone: the 47000 kN C0 and 2060 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The 19800/47000 kN ratings, 2060 kN Pu and 2450000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/1060B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 240/1060B?",
        "a": "240/1060B is an NTN double-row spherical roller bearing to ISO 15: 1060 mm bore, 1500 mm OD and 438 mm width (41.732 × 59.055 × 17.244 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 19800 kN, C0 47000 kN, Pu 2060 kN, grease limiting speed 140 r/min, oil 180 r/min, mass about 2450000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "240/1060B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 240/1060BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 240/1060B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 240/1060B?",
        "a": "240/1060B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 240/1060B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 19800 kN C / 47000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "240-1060BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 240-1060BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=217",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "240-1060b",
      "240-1060B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "240-1060BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 240/1060BK30",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 1060,
    "D_mm": 1500,
    "B_mm": 438,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 19800,
    "static_load_kN": 47000,
    "fatigue_load_limit_kN": 2060,
    "limiting_speed_rpm": 140,
    "max_rpm": 140,
    "speed_oil_rpm": 180,
    "weight_g": 2140000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "240/1060BK30 is the basic execution of NTN's spherical roller range for a 1060 mm shaft — 19800 kN basic dynamic capacity in a 2140000 g, open ISO 15 envelope. The leading digits are the ISO 15 dimension series (24000 series); the bore code resolves to 1060 mm (two-digit code ×5, with the 00–03 exception table), and 1500 mm OD / 438 mm width follow the general plan. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. The 220.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 438 mm-wide ring seats fully on both sides. Fillet radii on shaft and housing must clear the ring chamfers of the 438 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 1060 mm bore 240/1060BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 180 r/min needs drain and level design; flooding the 438 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 240/1060BK30 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 240/1060BK30 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 240/1060BK30 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 19800/47000 kN ratings, 2060 kN Pu and 2140000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/1060BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 240/1060BK30?",
        "a": "240/1060BK30 is an NTN double-row spherical roller bearing to ISO 15: 1060 mm bore, 1500 mm OD and 438 mm width (41.732 × 59.055 × 17.244 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 19800 kN, C0 47000 kN, Pu 2060 kN, grease limiting speed 140 r/min, oil 180 r/min, mass about 2140000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 240/1060BK30 mounts on a matching adapter or withdrawal sleeve on a plain 1060 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 240/1060B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 240/1060BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 240/1060BK30?",
        "a": "240/1060BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 240/1060BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 19800 kN C / 47000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "240-1060B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 240-1060B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=217",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "240-1060bk30",
      "240-1060BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-1120",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/1120",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 1120,
    "D_mm": 1460,
    "B_mm": 250,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 10900,
    "static_load_kN": 26700,
    "fatigue_load_limit_kN": 1470,
    "limiting_speed_rpm": 150,
    "max_rpm": 150,
    "speed_oil_rpm": 200,
    "weight_g": 1140000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 239/1120 with a cylindrical bore and plain outer ring (no D1/W33 groove): 1120 mm bore, 1460 mm OD, 250 mm width, rated 150 r/min on grease. Numbering ties 239/1120 to its envelope and execution: same-number EA versus EM or plain variants share the 1120 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Suffix reading on 239/1120: the bare number is the standard open execution; quote the full code because each suffix is a distinct article. Pu 1470 kN against C0 26700 kN anchors the contamination derating; for dirty mining duty the adjusted life of 239/1120 moves with cleanliness far more than with small C variations. Fillet radii on shaft and housing must clear the ring chamfers of the 250 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 1120 mm bore 239/1120 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 250 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 239/1120 by envelope alone: the 26700 kN C0 and 1470 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 1120 mm bearing, and drive-up procedures differ.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 250 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 10900/26700 kN ratings, 1470 kN Pu and 1140000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/1120 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/1120?",
        "a": "239/1120 is an NTN double-row spherical roller bearing to ISO 15: 1120 mm bore, 1460 mm OD and 250 mm width (44.094 × 57.48 × 9.843 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 10900 kN, C0 26700 kN, Pu 1470 kN, grease limiting speed 150 r/min, oil 200 r/min, mass about 1140000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "239/1120 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 239/1120K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/1120 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/1120?",
        "a": "239/1120 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/1120 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 10900 kN C / 26700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-1120K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 239-1120K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=217",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-1120"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-1120K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/1120K",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 1120,
    "D_mm": 1460,
    "B_mm": 250,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 10900,
    "static_load_kN": 26700,
    "fatigue_load_limit_kN": 1470,
    "limiting_speed_rpm": 150,
    "max_rpm": 150,
    "speed_oil_rpm": 200,
    "weight_g": 1100000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "239/1120K belongs to the 23900 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. Reading the full code: the number gives the 1120×1460 mm envelope, — names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. 1120 mm bore is 44.094 in and 1460 mm OD is 57.48 in; the ISO 15 envelope swaps between brands, but the 10900/26700 kN ratings and cage design are NTN 2203E values. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 239/1120K leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 1120 mm bore 239/1120K is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 150 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 239/1120K on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 239/1120K on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 1120 mm bearing, and drive-up procedures differ.",
      "The 10900/26700 kN ratings, 1470 kN Pu and 1100000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/1120K (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/1120K?",
        "a": "239/1120K is an NTN double-row spherical roller bearing to ISO 15: 1120 mm bore, 1460 mm OD and 250 mm width (44.094 × 57.48 × 9.843 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 10900 kN, C0 26700 kN, Pu 1470 kN, grease limiting speed 150 r/min, oil 200 r/min, mass about 1100000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 239/1120K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 239/1120."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/1120K is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/1120K?",
        "a": "239/1120K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/1120K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 10900 kN C / 26700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-1120",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 239-1120 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=217",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-1120k",
      "239-1120K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "230-1120B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 230/1120B",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 1120,
    "D_mm": 1580,
    "B_mm": 345,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 17400,
    "static_load_kN": 39000,
    "fatigue_load_limit_kN": 2310,
    "limiting_speed_rpm": 150,
    "max_rpm": 150,
    "speed_oil_rpm": 190,
    "weight_g": 2160000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 230/1120B denotes the 1120 mm bore spherical roller bearing (17400 kN C / 39000 kN C0) in the 23000 series, the self-aligning choice for heavy combined load. Digit by digit the code reads as spherical-roller dimension series plus 1120 mm bore; the 345 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Open by design, 230/1120B requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Grease/oil ratio: the 150 r/min limiting value is .79 of the 190 r/min oil value; heavy 345 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 1120 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 1120 mm bore 230/1120B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 150 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 17400 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 1120 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 17400 kN rating no longer applies.",
      "The 17400/39000 kN ratings, 2310 kN Pu and 2160000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 230/1120B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 230/1120B?",
        "a": "230/1120B is an NTN double-row spherical roller bearing to ISO 15: 1120 mm bore, 1580 mm OD and 345 mm width (44.094 × 62.205 × 13.583 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 17400 kN, C0 39000 kN, Pu 2310 kN, grease limiting speed 150 r/min, oil 190 r/min, mass about 2160000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "230/1120B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 230/1120BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 230/1120B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 230/1120B?",
        "a": "230/1120B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 230/1120B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 17400 kN C / 39000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "230-1120BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 230-1120BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=217",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "230-1120b",
      "230-1120B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "230-1120BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 230/1120BK",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 1120,
    "D_mm": 1580,
    "B_mm": 345,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 17400,
    "static_load_kN": 39000,
    "fatigue_load_limit_kN": 2310,
    "limiting_speed_rpm": 150,
    "max_rpm": 150,
    "speed_oil_rpm": 190,
    "weight_g": 2090000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "230/1120BK belongs to the 23000 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (23000 series); the bore code resolves to 1120 mm (two-digit code ×5, with the 00–03 exception table), and 1580 mm OD / 345 mm width follow the general plan. Pu 2310 kN is the catalogue fatigue load limit for 230/1120BK, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Selection: the C0/C ratio of 2.24 (39000/17400 kN) reflects the heavy static and shock proportioning of 230/1120BK; size the equivalent load at the required L10 with shock factor for the application. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 1120 mm bore 230/1120BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 230/1120B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 1120 mm bearing, and drive-up procedures differ.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 230/1120B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 230/1120BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 17400/39000 kN ratings, 2310 kN Pu and 2090000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 230/1120BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 230/1120BK?",
        "a": "230/1120BK is an NTN double-row spherical roller bearing to ISO 15: 1120 mm bore, 1580 mm OD and 345 mm width (44.094 × 62.205 × 13.583 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 17400 kN, C0 39000 kN, Pu 2310 kN, grease limiting speed 150 r/min, oil 190 r/min, mass about 2090000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 230/1120BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 230/1120B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 230/1120BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 230/1120BK?",
        "a": "230/1120BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 230/1120BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 17400 kN C / 39000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "230-1120B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 230-1120B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=217",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "230-1120bk",
      "230-1120BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "240-1120B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 240/1120B",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 1120,
    "D_mm": 1580,
    "B_mm": 462,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 21700,
    "static_load_kN": 52500,
    "fatigue_load_limit_kN": 2230,
    "limiting_speed_rpm": 120,
    "max_rpm": 120,
    "speed_oil_rpm": 160,
    "weight_g": 2890000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "240/1120B is the basic execution of NTN's spherical roller range for a 1120 mm shaft — 21700 kN basic dynamic capacity in a 2890000 g, open ISO 15 envelope. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (cylindrical), lubrication feature (none); 240/1120B is assembled exactly in that order. The 230.0 mm radial section over the 1120 mm bore carries two roller rows; capacity per millimetre of bore is about 19.4 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. 1120 mm bore is 44.094 in and 1580 mm OD is 62.205 in; the ISO 15 envelope swaps between brands, but the 21700/52500 kN ratings and cage design are NTN 2203E values. Fit the cylindrical-bore 240/1120B with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 1120 mm bore 240/1120B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 240/1120B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 1120×1580 mm envelope is identical.",
      "The cylindrical-bore 240/1120B and its tapered-bore counterpart 240/1120BK30 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 1120 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The cylindrical-bore 240/1120B and its tapered-bore counterpart 240/1120BK30 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 21700/52500 kN ratings, 2230 kN Pu and 2890000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/1120B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 240/1120B?",
        "a": "240/1120B is an NTN double-row spherical roller bearing to ISO 15: 1120 mm bore, 1580 mm OD and 462 mm width (44.094 × 62.205 × 18.189 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 21700 kN, C0 52500 kN, Pu 2230 kN, grease limiting speed 120 r/min, oil 160 r/min, mass about 2890000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "240/1120B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 240/1120BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 240/1120B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 240/1120B?",
        "a": "240/1120B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 240/1120B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 21700 kN C / 52500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "240-1120BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 240-1120BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=217",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "240-1120b",
      "240-1120B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "240-1120BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 240/1120BK30",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 1120,
    "D_mm": 1580,
    "B_mm": 462,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 21700,
    "static_load_kN": 52500,
    "fatigue_load_limit_kN": 2230,
    "limiting_speed_rpm": 120,
    "max_rpm": 120,
    "speed_oil_rpm": 160,
    "weight_g": 2840000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "240/1120BK30 belongs to the 24000 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. Reading the full code: the number gives the 1120×1580 mm envelope, — names the cage/capacity execution, K30 marks the 1:30 tapered bore for sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. Suffix reading on 240/1120BK30: the bare number is the standard open execution; K30 marks the 1:30 tapered bore of the wide series; B marks the standard large-bore internal design on slash-size 230–232 series; quote the full code because each suffix is a distinct article. Catalogue mass 2840000 g (2840.00 kg) for the 1120×1580×462 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Never mount 240/1120BK30 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 1580 mm race.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 1120 mm bore 240/1120BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 1120 mm bearing, and drive-up procedures differ.",
      "Never substitute 240/1120BK30 by envelope alone: the 52500 kN C0 and 2230 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 1120 mm bearing, and drive-up procedures differ.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 462 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 21700/52500 kN ratings, 2230 kN Pu and 2840000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/1120BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 240/1120BK30?",
        "a": "240/1120BK30 is an NTN double-row spherical roller bearing to ISO 15: 1120 mm bore, 1580 mm OD and 462 mm width (44.094 × 62.205 × 18.189 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 21700 kN, C0 52500 kN, Pu 2230 kN, grease limiting speed 120 r/min, oil 160 r/min, mass about 2840000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 240/1120BK30 mounts on a matching adapter or withdrawal sleeve on a plain 1120 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 240/1120B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 240/1120BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 240/1120BK30?",
        "a": "240/1120BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 240/1120BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 21700 kN C / 52500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "240-1120B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 240-1120B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=217",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "240-1120bk30",
      "240-1120BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-1180",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/1180",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 1180,
    "D_mm": 1540,
    "B_mm": 272,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 12200,
    "static_load_kN": 29800,
    "fatigue_load_limit_kN": 1650,
    "limiting_speed_rpm": 140,
    "max_rpm": 140,
    "speed_oil_rpm": 180,
    "weight_g": 1390000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "239/1180 belongs to the 23900 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 1180 mm (two-digit code ×5, with the 00–03 exception table), and 1540 mm OD / 272 mm width follow the general plan. Pu 1650 kN is the catalogue fatigue load limit for 239/1180, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. The 180.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 272 mm-wide ring seats fully on both sides. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 1180 mm bore 239/1180 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The cylindrical-bore 239/1180 and its tapered-bore counterpart 239/1180K share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 12200 kN rating no longer applies.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 272 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 239/1180 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 12200/29800 kN ratings, 1650 kN Pu and 1390000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/1180 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/1180?",
        "a": "239/1180 is an NTN double-row spherical roller bearing to ISO 15: 1180 mm bore, 1540 mm OD and 272 mm width (46.457 × 60.63 × 10.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 12200 kN, C0 29800 kN, Pu 1650 kN, grease limiting speed 140 r/min, oil 180 r/min, mass about 1390000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "239/1180 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 239/1180K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/1180 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/1180?",
        "a": "239/1180 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/1180 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 12200 kN C / 29800 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-1180K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 239-1180K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=217",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-1180"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-1180K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/1180K",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 1180,
    "D_mm": 1540,
    "B_mm": 272,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 12200,
    "static_load_kN": 29800,
    "fatigue_load_limit_kN": 1650,
    "limiting_speed_rpm": 140,
    "max_rpm": 140,
    "speed_oil_rpm": 180,
    "weight_g": 1340000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 1180 mm shaft, NTN supplies 239/1180K: sphered outer raceway, two roller rows, pressed-steel cage (standard execution), oil speed 180 r/min. Reading the full code: the number gives the 1180×1540 mm envelope, — names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. Pu 1650 kN is the catalogue fatigue load limit for 239/1180K, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. With about 10.3 kN of C per millimetre of the 1180 mm bore, 239/1180K screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 1180 mm bore 239/1180K is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 239/1180K carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 1180×1540 mm envelope is identical.",
      "Oil relubrication toward 180 r/min needs drain and level design; flooding the 272 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 140 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 239/1180K in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 12200/29800 kN ratings, 1650 kN Pu and 1340000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/1180K (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/1180K?",
        "a": "239/1180K is an NTN double-row spherical roller bearing to ISO 15: 1180 mm bore, 1540 mm OD and 272 mm width (46.457 × 60.63 × 10.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 12200 kN, C0 29800 kN, Pu 1650 kN, grease limiting speed 140 r/min, oil 180 r/min, mass about 1340000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 239/1180K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 239/1180."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/1180K is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/1180K?",
        "a": "239/1180K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/1180K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 12200 kN C / 29800 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-1180",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 239-1180 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=217",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-1180k",
      "239-1180K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-1250",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/1250",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 1250,
    "D_mm": 1630,
    "B_mm": 280,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 13400,
    "static_load_kN": 33500,
    "fatigue_load_limit_kN": 1810,
    "limiting_speed_rpm": 120,
    "max_rpm": 120,
    "speed_oil_rpm": 160,
    "weight_g": 1600000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "239/1250 belongs to the 23900 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. Numbering ties 239/1250 to its envelope and execution: same-number EA versus EM or plain variants share the 1250 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Open by design, 239/1250 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Selection: the C0/C ratio of 2.50 (33500/13400 kN) reflects the heavy static and shock proportioning of 239/1250; size the equivalent load at the required L10 with shock factor for the application. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 1250 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 1250 mm bore 239/1250 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 239/1250 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 239/1250 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The cylindrical-bore 239/1250 and its tapered-bore counterpart 239/1250K share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 13400 kN rating no longer applies.",
      "The 13400/33500 kN ratings, 1810 kN Pu and 1600000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/1250 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/1250?",
        "a": "239/1250 is an NTN double-row spherical roller bearing to ISO 15: 1250 mm bore, 1630 mm OD and 280 mm width (49.213 × 64.173 × 11.024 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 13400 kN, C0 33500 kN, Pu 1810 kN, grease limiting speed 120 r/min, oil 160 r/min, mass about 1600000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "239/1250 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 239/1250K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/1250 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/1250?",
        "a": "239/1250 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/1250 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 13400 kN C / 33500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-1250K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 239-1250K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=217",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-1250"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-1250K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/1250K",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 1250,
    "D_mm": 1630,
    "B_mm": 280,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 13400,
    "static_load_kN": 33500,
    "fatigue_load_limit_kN": 1810,
    "limiting_speed_rpm": 120,
    "max_rpm": 120,
    "speed_oil_rpm": 160,
    "weight_g": 1550000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "239/1250K is the basic execution of NTN's spherical roller range for a 1250 mm shaft — 13400 kN basic dynamic capacity in a 1550000 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 1250 mm bore; the 280 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Equivalent-load planning keeps a radial plus moderate axial combination on 239/1250K; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 1250 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 1250 mm bore 239/1250K is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 160 r/min needs drain and level design; flooding the 280 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 1250 mm bearing, and drive-up procedures differ.",
      "Oil relubrication toward 160 r/min needs drain and level design; flooding the 280 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 239/1250K on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 13400/33500 kN ratings, 1810 kN Pu and 1550000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/1250K (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/1250K?",
        "a": "239/1250K is an NTN double-row spherical roller bearing to ISO 15: 1250 mm bore, 1630 mm OD and 280 mm width (49.213 × 64.173 × 11.024 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 13400 kN, C0 33500 kN, Pu 1810 kN, grease limiting speed 120 r/min, oil 160 r/min, mass about 1550000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 239/1250K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 239/1250."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/1250K is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/1250K?",
        "a": "239/1250K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/1250K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 13400 kN C / 33500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-1250",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 239-1250 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=217",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-1250k",
      "239-1250K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-1320",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/1320",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 1320,
    "D_mm": 1720,
    "B_mm": 300,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 15100,
    "static_load_kN": 38000,
    "fatigue_load_limit_kN": 1930,
    "limiting_speed_rpm": 120,
    "max_rpm": 120,
    "speed_oil_rpm": 150,
    "weight_g": 1900000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "239/1320 belongs to the 23900 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (cylindrical), lubrication feature (none); 239/1320 is assembled exactly in that order. The 200.0 mm radial section over the 1320 mm bore carries two roller rows; capacity per millimetre of bore is about 11.4 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Selection: the C0/C ratio of 2.52 (38000/15100 kN) reflects the heavy static and shock proportioning of 239/1320; size the equivalent load at the required L10 with shock factor for the application. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 1320 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 1320 mm bore 239/1320 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 239/1320 by envelope alone: the 38000 kN C0 and 1930 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 1320 mm bearing, and drive-up procedures differ.",
      "Never substitute 239/1320 by envelope alone: the 38000 kN C0 and 1930 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The cylindrical-bore 239/1320 and its tapered-bore counterpart 239/1320K share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 15100/38000 kN ratings, 1930 kN Pu and 1900000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/1320 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/1320?",
        "a": "239/1320 is an NTN double-row spherical roller bearing to ISO 15: 1320 mm bore, 1720 mm OD and 300 mm width (51.969 × 67.717 × 11.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 15100 kN, C0 38000 kN, Pu 1930 kN, grease limiting speed 120 r/min, oil 150 r/min, mass about 1900000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "239/1320 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 239/1320K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/1320 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/1320?",
        "a": "239/1320 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/1320 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 15100 kN C / 38000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-1320K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 239-1320K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=217",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-1320"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-1320K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/1320K",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 1320,
    "D_mm": 1720,
    "B_mm": 300,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 15100,
    "static_load_kN": 38000,
    "fatigue_load_limit_kN": 1930,
    "limiting_speed_rpm": 120,
    "max_rpm": 120,
    "speed_oil_rpm": 150,
    "weight_g": 1840000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 239/1320K with a 1:12 tapered bore (K) and plain outer ring (no D1/W33 groove): 1320 mm bore, 1720 mm OD, 300 mm width, rated 120 r/min on grease. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 1320 mm (two-digit code ×5, with the 00–03 exception table), and 1720 mm OD / 300 mm width follow the general plan. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Speed planning: 120 r/min grease limiting speed is the cage/kinematic ceiling and 150 r/min is the oil-lubricated value for the 1320 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Fillet radii on shaft and housing must clear the ring chamfers of the 300 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 1320 mm bore 239/1320K is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 239/1320K on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Never substitute 239/1320K by envelope alone: the 38000 kN C0 and 1930 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 239/1320K in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 1320 mm bearing, and drive-up procedures differ.",
      "The 15100/38000 kN ratings, 1930 kN Pu and 1840000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/1320K (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/1320K?",
        "a": "239/1320K is an NTN double-row spherical roller bearing to ISO 15: 1320 mm bore, 1720 mm OD and 300 mm width (51.969 × 67.717 × 11.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 15100 kN, C0 38000 kN, Pu 1930 kN, grease limiting speed 120 r/min, oil 150 r/min, mass about 1840000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 239/1320K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 239/1320."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/1320K is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/1320K?",
        "a": "239/1320K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/1320K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 15100 kN C / 38000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-1320",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 239-1320 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=217",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-1320k",
      "239-1320K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-1400",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/1400",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 1400,
    "D_mm": 1820,
    "B_mm": 315,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 16800,
    "static_load_kN": 43000,
    "fatigue_load_limit_kN": 2570,
    "limiting_speed_rpm": 100,
    "max_rpm": 100,
    "speed_oil_rpm": 130,
    "weight_g": 2230000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 239/1400 with a cylindrical bore and plain outer ring (no D1/W33 groove): 1400 mm bore, 1820 mm OD, 315 mm width, rated 100 r/min on grease. Reading the full code: the number gives the 1400×1820 mm envelope, — names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and plain outer ring (no D1/W33 groove) completes the order number. Open by design, 239/1400 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Selection: the C0/C ratio of 2.56 (43000/16800 kN) reflects the heavy static and shock proportioning of 239/1400; size the equivalent load at the required L10 with shock factor for the application. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 1400 mm set.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 1400 mm bore 239/1400 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 239/1400 by envelope alone: the 43000 kN C0 and 2570 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Oil relubrication toward 130 r/min needs drain and level design; flooding the 315 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 239/1400 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 16800 kN rating no longer applies.",
      "The 16800/43000 kN ratings, 2570 kN Pu and 2230000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/1400 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/1400?",
        "a": "239/1400 is an NTN double-row spherical roller bearing to ISO 15: 1400 mm bore, 1820 mm OD and 315 mm width (55.118 × 71.654 × 12.402 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 16800 kN, C0 43000 kN, Pu 2570 kN, grease limiting speed 100 r/min, oil 130 r/min, mass about 2230000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "239/1400 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 239/1400K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/1400 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/1400?",
        "a": "239/1400 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/1400 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 16800 kN C / 43000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-1400K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 239-1400K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=217",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-1400"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-1400K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/1400K",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 1400,
    "D_mm": 1820,
    "B_mm": 315,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 16800,
    "static_load_kN": 43000,
    "fatigue_load_limit_kN": 2570,
    "limiting_speed_rpm": 100,
    "max_rpm": 100,
    "speed_oil_rpm": 130,
    "weight_g": 2160000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 239/1400K denotes the 1400 mm bore spherical roller bearing (16800 kN C / 43000 kN C0) in the 23900 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 1400 mm (two-digit code ×5, with the 00–03 exception table), and 1820 mm OD / 315 mm width follow the general plan. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. 1400 mm bore is 55.118 in and 1820 mm OD is 71.654 in; the ISO 15 envelope swaps between brands, but the 16800/43000 kN ratings and cage design are NTN 2203E values. Mount 239/1400K on its adapter or withdrawal sleeve on the 1400 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 1400 mm bore 239/1400K is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 239/1400: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 239/1400K on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 1400 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 239/1400K on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 16800/43000 kN ratings, 2570 kN Pu and 2160000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/1400K (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/1400K?",
        "a": "239/1400K is an NTN double-row spherical roller bearing to ISO 15: 1400 mm bore, 1820 mm OD and 315 mm width (55.118 × 71.654 × 12.402 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 16800 kN, C0 43000 kN, Pu 2570 kN, grease limiting speed 100 r/min, oil 130 r/min, mass about 2160000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 239/1400K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 239/1400."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/1400K is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/1400K?",
        "a": "239/1400K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/1400K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 16800 kN C / 43000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-1400",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 239-1400 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=217",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-1400k",
      "239-1400K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22205",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22205 E",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 49.9,
    "static_load_kN": 44,
    "fatigue_load_limit_kN": 4.75,
    "max_rpm": 17000,
    "reference_speed_rpm": 13000,
    "limiting_speed_rpm": 17000,
    "weight_g": 260,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22205 is a double-row spherical roller bearing in the 22200-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. On the SKF nameplate, 22205 follows the ISO 15 convention: 2 for the spherical roller type, 22 for the dimension series 22 (medium OD, wide), final digits 05 for the 25 mm bore. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. The 4.75 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 0.88 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 25 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.",
    "applications": [
      "compactor and roller vibratory drums",
      "woodworking machine cutter spindles",
      "small vibrating screens and sieve shafts",
      "agricultural elevator and auger shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "smearing on the roller-raceway contact during skid starts below the minimum load"
    ],
    "pitfalls": [
      "At a 25 mm bore the small barrel rollers skid readily at light load; keep the radial load above the minimum (roughly 0.01·C0) and avoid long idling at speed — unloaded 22205 rows scuff the raceway before fatigue ever shows.",
      "The 22200-series series at 25 mm bore (52×18 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "Catalogue reference speed and limiting speed are different limits: the 13,000 r/min reference is a thermal criterion under load, while the 17,000 r/min limiting value is the mechanical ceiling — observe both.",
      "The 49.9/44 kN ratings are SKF catalogue values for this exact execution (22205 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 22205 (cylindrical bore as listed, tapered-bore 22205 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22205 E designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22205?",
        "a": "The 22205 E is a double-row spherical roller bearing with 25 mm bore, 52 mm outer diameter and 18 mm width (0.984 × 2.047 × 0.709 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 49.9 kN, C0 44 kN, fatigue load limit Pu 4.75 kN, reference speed 13,000 r/min, limiting speed 17,000 r/min, mass about 260 g. It is an open, self-aligning bearing with a stamped window-type steel cage."
      },
      {
        "q": "How does the 22205 bore code work?",
        "a": "The last two digits of 22205 are bore code 05, so 05 × 5 = 25 mm bore. The 52 mm OD and 18 mm width come from the ISO 15 dimension-series plan (dimension series 22 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the E suffix mean on 22205?",
        "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves."
      },
      {
        "q": "Can 22205 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 22205K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22205 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22205-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H305 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22205",
      "22205 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22206",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22206 E",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 66.1,
    "static_load_kN": 60,
    "fatigue_load_limit_kN": 6.4,
    "max_rpm": 14000,
    "reference_speed_rpm": 10000,
    "limiting_speed_rpm": 14000,
    "weight_g": 290,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22206 E is a 30×62×20 mm spherical roller bearing — the dimension series 22 (medium OD, wide) entry for a 30 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. The code breaks down as type digit 2 (double-row spherical roller), dimension series 22 (dimension series 22 (medium OD, wide)), and bore code 06 = 30 mm; dimensions 30×62×20 mm therefore match the ISO 15 envelope. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Selection arithmetic: the C0/C ratio is about 0.91 (static 60 kN against dynamic 66.1 kN), typical of a spherical roller sized for heavy combined loads, and the 6.4 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. A 30 mm rotating inner ring usually runs k5 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.",
    "applications": [
      "vibrating screen and scalper main shafts",
      "conveyor drive and bend pulleys",
      "industrial gearbox output shafts",
      "centrifugal pump and fan shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals"
    ],
    "pitfalls": [
      "On this 30 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.",
      "The 22200-series series at 30 mm bore (62×20 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.",
      "Catalogue reference speed and limiting speed are different limits: the 10,000 r/min reference is a thermal criterion under load, while the 14,000 r/min limiting value is the mechanical ceiling — observe both.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 22206 pits long before its L10 life.",
      "The 66.1/60 kN ratings are SKF catalogue values for this exact execution (22206 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 22206 (cylindrical bore as listed, tapered-bore 22206 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22206 E designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22206?",
        "a": "The 22206 E is a double-row spherical roller bearing with 30 mm bore, 62 mm outer diameter and 20 mm width (1.181 × 2.441 × 0.787 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 66.1 kN, C0 60 kN, fatigue load limit Pu 6.4 kN, reference speed 10,000 r/min, limiting speed 14,000 r/min, mass about 290 g. It is an open, self-aligning bearing with a stamped window-type steel cage."
      },
      {
        "q": "How does the 22206 bore code work?",
        "a": "The last two digits of 22206 are bore code 06, so 06 × 5 = 30 mm bore. The 62 mm OD and 20 mm width come from the ISO 15 dimension-series plan (dimension series 22 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the E suffix mean on 22206?",
        "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves."
      },
      {
        "q": "Can 22206 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 22206K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22206 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22206-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H306 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C2206-TN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2206 TN9 shares the 30×62×20 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C2206-KTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2206 KTN9 shares the 30×62×20 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C2206-V",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2206 V shares the 30×62×20 mm envelope but catalogue C/C0 differ (76.5/71 kN vs 66.1/60 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22206",
      "22206 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22207",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22207 E",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 35,
    "D_mm": 72,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 88.8,
    "static_load_kN": 85,
    "fatigue_load_limit_kN": 9.3,
    "max_rpm": 12000,
    "reference_speed_rpm": 9000,
    "limiting_speed_rpm": 12000,
    "weight_g": 450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 22207 appears as 22207 E: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 35×72×23 mm to the ISO 15 boundary plan. Reading the designation: the leading 2 marks a spherical roller bearing, the 22 is the ISO 15 dimension series (dimension series 22 (medium OD, wide)), and the last two digits encode the 35 mm bore; the 72 mm OD and 23 mm width follow the ISO 15 general plan. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. The 18.5 mm radial section height ((72−35)/2) and 450 g catalogue mass frame a 35 mm bore bearing rated at 88.8 kN C — roughly 2.54 kN of dynamic capacity per millimetre of bore before application factors. After mounting, swing the outer ring to confirm free self-alignment: the 22207 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.",
    "applications": [
      "industrial gearbox output shafts",
      "centrifugal pump and fan shafts",
      "hammer-mill and crusher rotors",
      "continuous-caster guide rolls"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "On this 35 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.",
      "The 22200-series series at 35 mm bore (72×23 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 22207 pits long before its L10 life.",
      "The 22207 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 88.8/85 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 88.8/85 kN ratings are SKF catalogue values for this exact execution (22207 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 22207 (cylindrical bore as listed, tapered-bore 22207 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22207 E designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22207?",
        "a": "The 22207 E is a double-row spherical roller bearing with 35 mm bore, 72 mm outer diameter and 23 mm width (1.378 × 2.835 × 0.906 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 88.8 kN, C0 85 kN, fatigue load limit Pu 9.3 kN, reference speed 9,000 r/min, limiting speed 12,000 r/min, mass about 450 g. It is an open, self-aligning bearing with a stamped window-type steel cage."
      },
      {
        "q": "How does the 22207 bore code work?",
        "a": "The last two digits of 22207 are bore code 07, so 07 × 5 = 35 mm bore. The 72 mm OD and 23 mm width come from the ISO 15 dimension-series plan (dimension series 22 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the E suffix mean on 22207?",
        "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves."
      },
      {
        "q": "Can 22207 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 22207K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22207 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22207-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H307 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C2207-TN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2207 TN9 shares the 35×72×23 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C2207-KTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2207 KTN9 shares the 35×72×23 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C2207-V",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2207 V shares the 35×72×23 mm envelope but catalogue C/C0 differ (95/96 kN vs 88.8/85 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22207",
      "22207 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22208",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22208 E",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 40,
    "D_mm": 80,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 98.5,
    "static_load_kN": 90,
    "fatigue_load_limit_kN": 9.8,
    "max_rpm": 11000,
    "reference_speed_rpm": 8000,
    "limiting_speed_rpm": 11000,
    "weight_g": 530,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22208 E belongs to the SKF spherical roller range — the 40 mm bore entry in the 22200-series series (dimension series 22 (medium OD, wide)), dimensioned 80 mm OD and 23 mm wide. Digit by digit, 22208 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 22, and bore reference 08 resolving to 40 mm; 80 mm OD and 23 mm width are the matching ISO 15 boundary values. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Catalogue mass 530 g for the 40×80×23 mm open execution covers the a stamped window-type steel cage; tapered-bore and sealed variants differ in mass and carry their own order numbers. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 22208 EK variant instead and measure the drive-up or clearance reduction, not the nut torque.",
    "applications": [
      "hammer-mill and crusher rotors",
      "continuous-caster guide rolls",
      "extruder gearbox shafts",
      "vibrating screen and scalper main shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "On this 40 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.",
      "The 22200-series series at 40 mm bore (80×23 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.",
      "The 22208 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 98.5/90 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "Shaft and housing fillets must clear the bearing chamfer so the 23 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 98.5/90 kN ratings are SKF catalogue values for this exact execution (22208 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 22208 (cylindrical bore as listed, tapered-bore 22208 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22208 E designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22208?",
        "a": "The 22208 E is a double-row spherical roller bearing with 40 mm bore, 80 mm outer diameter and 23 mm width (1.575 × 3.15 × 0.906 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 98.5 kN, C0 90 kN, fatigue load limit Pu 9.8 kN, reference speed 8,000 r/min, limiting speed 11,000 r/min, mass about 530 g. It is an open, self-aligning bearing with a stamped window-type steel cage."
      },
      {
        "q": "How does the 22208 bore code work?",
        "a": "The last two digits of 22208 are bore code 08, so 08 × 5 = 40 mm bore. The 80 mm OD and 23 mm width come from the ISO 15 dimension-series plan (dimension series 22 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the E suffix mean on 22208?",
        "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves."
      },
      {
        "q": "Can 22208 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 22208K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22208 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22208-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H308 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C2208-TN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2208 TN9 shares the 40×80×23 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C2208-KTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2208 KTN9 shares the 40×80×23 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C2208-V",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2208 V shares the 40×80×23 mm envelope but catalogue C/C0 differ (102/104 kN vs 98.5/90 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22208",
      "22208 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22209",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22209 E",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 45,
    "D_mm": 85,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 104,
    "static_load_kN": 98,
    "fatigue_load_limit_kN": 10.8,
    "max_rpm": 10000,
    "reference_speed_rpm": 7500,
    "limiting_speed_rpm": 10000,
    "weight_g": 580,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 45 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 22209 under catalogue execution 22209 E: two barrel-roller rows on a sphered outer raceway. Numbering ties the bearing to its envelope: 22209 means spherical-roller type, dimension series 22, 45 mm bore — which is why the 85×23 mm outline swaps dimensionally with other ISO 15 bearings of the same code. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. At 7,500 r/min reference speed the 20.0 mm-section 22209 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 10,000 r/min as the mechanical ceiling. Mount with the spherical bearing's self-alignment in mind: it compensates ≈ 0.5–2.5° of misalignment depending on series, but the shaft and housing seats still set the datum — a rotating inner ring on a 45 mm shaft typically takes a k5 seat with an H7 housing bore.",
    "applications": [
      "extruder gearbox shafts",
      "vibrating screen and scalper main shafts",
      "conveyor drive and bend pulleys",
      "industrial gearbox output shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "smearing on the roller-raceway contact during skid starts below the minimum load"
    ],
    "pitfalls": [
      "On this 45 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.",
      "The 22200-series series at 45 mm bore (85×23 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.",
      "Shaft and housing fillets must clear the bearing chamfer so the 23 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 580 g mass and 23 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 22209.",
      "The 104/98 kN ratings are SKF catalogue values for this exact execution (22209 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 22209 (cylindrical bore as listed, tapered-bore 22209 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22209 E designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22209?",
        "a": "The 22209 E is a double-row spherical roller bearing with 45 mm bore, 85 mm outer diameter and 23 mm width (1.772 × 3.346 × 0.906 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 104 kN, C0 98 kN, fatigue load limit Pu 10.8 kN, reference speed 7,500 r/min, limiting speed 10,000 r/min, mass about 580 g. It is an open, self-aligning bearing with a stamped window-type steel cage."
      },
      {
        "q": "How does the 22209 bore code work?",
        "a": "The last two digits of 22209 are bore code 09, so 09 × 5 = 45 mm bore. The 85 mm OD and 23 mm width come from the ISO 15 dimension-series plan (dimension series 22 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the E suffix mean on 22209?",
        "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves."
      },
      {
        "q": "Can 22209 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 22209K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22209 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22209-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H309 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C2209-TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2209 TN9 shares the 45×85×23 mm envelope but catalogue C/C0 differ (93/93 kN vs 104/98 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C2209-KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2209 KTN9 shares the 45×85×23 mm envelope but catalogue C/C0 differ (93/93 kN vs 104/98 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C2209-V",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2209 V shares the 45×85×23 mm envelope but catalogue C/C0 differ (106/110 kN vs 104/98 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22209",
      "22209 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22210",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22210 E",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 50,
    "D_mm": 90,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 107,
    "static_load_kN": 108,
    "fatigue_load_limit_kN": 11.8,
    "max_rpm": 9500,
    "reference_speed_rpm": 7000,
    "limiting_speed_rpm": 9500,
    "weight_g": 630,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF 22210 (22210 E) is the spherical-roller choice for a 50 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 90×23 mm ISO 15 envelope. Reading the designation: the leading 2 marks a spherical roller bearing, the 22 is the ISO 15 dimension series (dimension series 22 (medium OD, wide)), and the last two digits encode the 50 mm bore; the 90 mm OD and 23 mm width follow the ISO 15 general plan. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. With C 107 kN and C0 108 kN, the 22210 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. A 50 mm rotating inner ring usually runs k5 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.",
    "applications": [
      "centrifugal pump and fan shafts",
      "hammer-mill and crusher rotors",
      "continuous-caster guide rolls",
      "extruder gearbox shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "smearing on the roller-raceway contact during skid starts below the minimum load"
    ],
    "pitfalls": [
      "On this 50 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.",
      "The 22200-series series at 50 mm bore (90×23 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.",
      "Shaft and housing fillets must clear the bearing chamfer so the 23 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "Shaft and housing fillets must clear the bearing chamfer so the 23 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 107/108 kN ratings are SKF catalogue values for this exact execution (22210 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 22210 (cylindrical bore as listed, tapered-bore 22210 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22210 E designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22210?",
        "a": "The 22210 E is a double-row spherical roller bearing with 50 mm bore, 90 mm outer diameter and 23 mm width (1.969 × 3.543 × 0.906 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 107 kN, C0 108 kN, fatigue load limit Pu 11.8 kN, reference speed 7,000 r/min, limiting speed 9,500 r/min, mass about 630 g. It is an open, self-aligning bearing with a stamped window-type steel cage."
      },
      {
        "q": "How does the 22210 bore code work?",
        "a": "The last two digits of 22210 are bore code 10, so 10 × 5 = 50 mm bore. The 90 mm OD and 23 mm width come from the ISO 15 dimension-series plan (dimension series 22 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the E suffix mean on 22210?",
        "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves."
      },
      {
        "q": "Can 22210 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 22210K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22210 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22210-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H310 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C2210-TN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2210 TN9 shares the 50×90×23 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C2210-KTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2210 KTN9 shares the 50×90×23 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C2210-V",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2210 V shares the 50×90×23 mm envelope but catalogue C/C0 differ (114/122 kN vs 107/108 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22210",
      "22210 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22211",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22211 E",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 55,
    "D_mm": 100,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 129,
    "static_load_kN": 127,
    "fatigue_load_limit_kN": 13.7,
    "max_rpm": 8500,
    "reference_speed_rpm": 6300,
    "limiting_speed_rpm": 8500,
    "weight_g": 840,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number 22211 E in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 55 mm shaft, dimension series 22 (medium OD, wide), with open execution and a stamped window-type steel cage. Digit by digit, 22211 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 22, and bore reference 11 resolving to 55 mm; 100 mm OD and 25 mm width are the matching ISO 15 boundary values. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. The 13.7 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 0.98 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. After mounting, swing the outer ring to confirm free self-alignment: the 22211 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.",
    "applications": [
      "continuous-caster guide rolls",
      "extruder gearbox shafts",
      "vibrating screen and scalper main shafts",
      "conveyor drive and bend pulleys"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals"
    ],
    "pitfalls": [
      "On this 55 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.",
      "The 22200-series series at 55 mm bore (100×25 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.",
      "The 840 g mass and 25 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 22211.",
      "The 840 g mass and 25 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 22211.",
      "The 129/127 kN ratings are SKF catalogue values for this exact execution (22211 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 22211 (cylindrical bore as listed, tapered-bore 22211 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22211 E designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22211?",
        "a": "The 22211 E is a double-row spherical roller bearing with 55 mm bore, 100 mm outer diameter and 25 mm width (2.165 × 3.937 × 0.984 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 129 kN, C0 127 kN, fatigue load limit Pu 13.7 kN, reference speed 6,300 r/min, limiting speed 8,500 r/min, mass about 840 g. It is an open, self-aligning bearing with a stamped window-type steel cage."
      },
      {
        "q": "How does the 22211 bore code work?",
        "a": "The last two digits of 22211 are bore code 11, so 11 × 5 = 55 mm bore. The 100 mm OD and 25 mm width come from the ISO 15 dimension-series plan (dimension series 22 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the E suffix mean on 22211?",
        "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves."
      },
      {
        "q": "Can 22211 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 22211K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22211 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22211-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H311 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C2211-TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2211 TN9 shares the 55×100×25 mm envelope but catalogue C/C0 differ (116/114 kN vs 129/127 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C2211-KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2211 KTN9 shares the 55×100×25 mm envelope but catalogue C/C0 differ (116/114 kN vs 129/127 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C2211-V",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2211 V shares the 55×100×25 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C2211-KV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2211 KV shares the 55×100×25 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22211",
      "22211 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22212",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22212 E",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 60,
    "D_mm": 110,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 159,
    "static_load_kN": 166,
    "fatigue_load_limit_kN": 18.6,
    "max_rpm": 7500,
    "reference_speed_rpm": 5600,
    "limiting_speed_rpm": 7500,
    "weight_g": 1150,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22212 is a double-row spherical roller bearing in the 22200-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. Numbering ties the bearing to its envelope: 22212 means spherical-roller type, dimension series 22, 60 mm bore — which is why the 110×28 mm outline swaps dimensionally with other ISO 15 bearings of the same code. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Selection arithmetic: the C0/C ratio is about 1.04 (static 166 kN against dynamic 159 kN), typical of a spherical roller sized for heavy combined loads, and the 18.6 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 22212 EK variant instead and measure the drive-up or clearance reduction, not the nut torque.",
    "applications": [
      "jaw and cone crusher main shafts",
      "paper-machine press and dryer rolls",
      "rolling-mill pinion and back-up shafts",
      "large vibrating screens and feeders"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Mount the 60 mm bore 22212 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 22200-series series at 60 mm bore (110×28 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 22212; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 22212; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 159/166 kN ratings are SKF catalogue values for this exact execution (22212 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 22212 (cylindrical bore as listed, tapered-bore 22212 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22212 E designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22212?",
        "a": "The 22212 E is a double-row spherical roller bearing with 60 mm bore, 110 mm outer diameter and 28 mm width (2.362 × 4.331 × 1.102 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 159 kN, C0 166 kN, fatigue load limit Pu 18.6 kN, reference speed 5,600 r/min, limiting speed 7,500 r/min, mass about 1150 g. It is an open, self-aligning bearing with a stamped window-type steel cage."
      },
      {
        "q": "How does the 22212 bore code work?",
        "a": "The last two digits of 22212 are bore code 12, so 12 × 5 = 60 mm bore. The 110 mm OD and 28 mm width come from the ISO 15 dimension-series plan (dimension series 22 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the E suffix mean on 22212?",
        "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves."
      },
      {
        "q": "Can 22212 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 22212K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22212 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22212-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H312 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C2212-TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2212 TN9 shares the 60×110×28 mm envelope but catalogue C/C0 differ (143/156 kN vs 159/166 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C2212-KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2212 KTN9 shares the 60×110×28 mm envelope but catalogue C/C0 differ (143/156 kN vs 159/166 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C2212-V",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2212 V shares the 60×110×28 mm envelope but catalogue C/C0 differ (166/190 kN vs 159/166 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C2212-KV",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2212 KV shares the 60×110×28 mm envelope but catalogue C/C0 differ (166/190 kN vs 159/166 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22212",
      "22212 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22213",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22213 E",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 65,
    "D_mm": 120,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 198,
    "static_load_kN": 216,
    "fatigue_load_limit_kN": 24,
    "max_rpm": 7000,
    "reference_speed_rpm": 5000,
    "limiting_speed_rpm": 7000,
    "weight_g": 1550,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22213 E is a 65×120×31 mm spherical roller bearing — the dimension series 22 (medium OD, wide) entry for a 65 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. On the SKF nameplate, 22213 follows the ISO 15 convention: 2 for the spherical roller type, 22 for the dimension series 22 (medium OD, wide), final digits 13 for the 65 mm bore. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. The 27.5 mm radial section height ((120−65)/2) and 1550 g catalogue mass frame a 65 mm bore bearing rated at 198 kN C — roughly 3.05 kN of dynamic capacity per millimetre of bore before application factors. Mount with the spherical bearing's self-alignment in mind: it compensates ≈ 0.5–2.5° of misalignment depending on series, but the shaft and housing seats still set the datum — a rotating inner ring on a 65 mm shaft typically takes a k5 seat with an H7 housing bore.",
    "applications": [
      "rolling-mill pinion and back-up shafts",
      "large vibrating screens and feeders",
      "marine propulsion and thruster shafts",
      "cement-mill trunnion and drive shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Mount the 65 mm bore 22213 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 22200-series series at 65 mm bore (120×31 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 198/216 kN ratings are SKF catalogue values for this exact execution (22213 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 22213 (cylindrical bore as listed, tapered-bore 22213 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22213 E designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22213?",
        "a": "The 22213 E is a double-row spherical roller bearing with 65 mm bore, 120 mm outer diameter and 31 mm width (2.559 × 4.724 × 1.22 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 198 kN, C0 216 kN, fatigue load limit Pu 24 kN, reference speed 5,000 r/min, limiting speed 7,000 r/min, mass about 1550 g. It is an open, self-aligning bearing with a stamped window-type steel cage."
      },
      {
        "q": "How does the 22213 bore code work?",
        "a": "The last two digits of 22213 are bore code 13, so 13 × 5 = 65 mm bore. The 120 mm OD and 31 mm width come from the ISO 15 dimension-series plan (dimension series 22 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the E suffix mean on 22213?",
        "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves."
      },
      {
        "q": "Can 22213 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 22213K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22213 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22213-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H313 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C2213-TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2213 TN9 shares the 65×120×31 mm envelope but catalogue C/C0 differ (180/180 kN vs 198/216 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C2213-KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2213 KTN9 shares the 65×120×31 mm envelope but catalogue C/C0 differ (180/180 kN vs 198/216 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C2213-V",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2213 V shares the 65×120×31 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C2213-KV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2213 KV shares the 65×120×31 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22213",
      "22213 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22214",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22214 E",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 70,
    "D_mm": 125,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 213,
    "static_load_kN": 228,
    "fatigue_load_limit_kN": 25.5,
    "max_rpm": 6700,
    "reference_speed_rpm": 5000,
    "limiting_speed_rpm": 6700,
    "weight_g": 1550,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 22214 appears as 22214 E: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 70×125×31 mm to the ISO 15 boundary plan. The code breaks down as type digit 2 (double-row spherical roller), dimension series 22 (dimension series 22 (medium OD, wide)), and bore code 14 = 70 mm; dimensions 70×125×31 mm therefore match the ISO 15 envelope. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Catalogue mass 1550 g for the 70×125×31 mm open execution covers the a stamped window-type steel cage; tapered-bore and sealed variants differ in mass and carry their own order numbers. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 31 mm width across two roller rows needs the full charge.",
    "applications": [
      "marine propulsion and thruster shafts",
      "cement-mill trunnion and drive shafts",
      "heavy conveyor head shafts in mining",
      "jaw and cone crusher main shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "smearing on the roller-raceway contact during skid starts below the minimum load"
    ],
    "pitfalls": [
      "Mount the 70 mm bore 22214 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 22200-series series at 70 mm bore (125×31 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.",
      "Catalogue reference speed and limiting speed are different limits: the 5,000 r/min reference is a thermal criterion under load, while the 6,700 r/min limiting value is the mechanical ceiling — observe both.",
      "Catalogue reference speed and limiting speed are different limits: the 5,000 r/min reference is a thermal criterion under load, while the 6,700 r/min limiting value is the mechanical ceiling — observe both.",
      "The 213/228 kN ratings are SKF catalogue values for this exact execution (22214 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 22214 (cylindrical bore as listed, tapered-bore 22214 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22214 E designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22214?",
        "a": "The 22214 E is a double-row spherical roller bearing with 70 mm bore, 125 mm outer diameter and 31 mm width (2.756 × 4.921 × 1.22 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 213 kN, C0 228 kN, fatigue load limit Pu 25.5 kN, reference speed 5,000 r/min, limiting speed 6,700 r/min, mass about 1550 g. It is an open, self-aligning bearing with a stamped window-type steel cage."
      },
      {
        "q": "How does the 22214 bore code work?",
        "a": "The last two digits of 22214 are bore code 14, so 14 × 5 = 70 mm bore. The 125 mm OD and 31 mm width come from the ISO 15 dimension-series plan (dimension series 22 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the E suffix mean on 22214?",
        "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves."
      },
      {
        "q": "Can 22214 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 22214K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22214 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22214-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H314 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C2214-TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2214 TN9 shares the 70×125×31 mm envelope but catalogue C/C0 differ (186/196 kN vs 213/228 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C2214-KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2214 KTN9 shares the 70×125×31 mm envelope but catalogue C/C0 differ (186/196 kN vs 213/228 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C2214-V",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2214 V shares the 70×125×31 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22214",
      "22214 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22215",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22215 E",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 75,
    "D_mm": 130,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 217,
    "static_load_kN": 240,
    "fatigue_load_limit_kN": 26.5,
    "max_rpm": 6300,
    "reference_speed_rpm": 4800,
    "limiting_speed_rpm": 6300,
    "weight_g": 1700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22215 E belongs to the SKF spherical roller range — the 75 mm bore entry in the 22200-series series (dimension series 22 (medium OD, wide)), dimensioned 130 mm OD and 31 mm wide. Reading the designation: the leading 2 marks a spherical roller bearing, the 22 is the ISO 15 dimension series (dimension series 22 (medium OD, wide)), and the last two digits encode the 75 mm bore; the 130 mm OD and 31 mm width follow the ISO 15 general plan. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. At 4,800 r/min reference speed the 27.5 mm-section 22215 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 6,300 r/min as the mechanical ceiling. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.",
    "applications": [
      "heavy conveyor head shafts in mining",
      "jaw and cone crusher main shafts",
      "paper-machine press and dryer rolls",
      "rolling-mill pinion and back-up shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals"
    ],
    "pitfalls": [
      "Mount the 75 mm bore 22215 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 22200-series series at 75 mm bore (130×31 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 22215 pits long before its L10 life.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 22215 pits long before its L10 life.",
      "The 217/240 kN ratings are SKF catalogue values for this exact execution (22215 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 22215 (cylindrical bore as listed, tapered-bore 22215 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22215 E designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22215?",
        "a": "The 22215 E is a double-row spherical roller bearing with 75 mm bore, 130 mm outer diameter and 31 mm width (2.953 × 5.118 × 1.22 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 217 kN, C0 240 kN, fatigue load limit Pu 26.5 kN, reference speed 4,800 r/min, limiting speed 6,300 r/min, mass about 1700 g. It is an open, self-aligning bearing with a stamped window-type steel cage."
      },
      {
        "q": "How does the 22215 bore code work?",
        "a": "The last two digits of 22215 are bore code 15, so 15 × 5 = 75 mm bore. The 130 mm OD and 31 mm width come from the ISO 15 dimension-series plan (dimension series 22 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the E suffix mean on 22215?",
        "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves."
      },
      {
        "q": "Can 22215 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 22215K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22215 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22215-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H315 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C2215",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2215 shares the 75×130×31 mm envelope but catalogue C/C0 differ (196/208 kN vs 217/240 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C2215-K",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2215 K shares the 75×130×31 mm envelope but catalogue C/C0 differ (196/208 kN vs 217/240 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C2215-V",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2215 V shares the 75×130×31 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C2215-KV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2215 KV shares the 75×130×31 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22215",
      "22215 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22216",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22216 E",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 80,
    "D_mm": 140,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 243,
    "static_load_kN": 270,
    "fatigue_load_limit_kN": 29,
    "max_rpm": 6000,
    "reference_speed_rpm": 4300,
    "limiting_speed_rpm": 6000,
    "weight_g": 2100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 80 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 22216 under catalogue execution 22216 E: two barrel-roller rows on a sphered outer raceway. Digit by digit, 22216 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 22, and bore reference 16 resolving to 80 mm; 140 mm OD and 33 mm width are the matching ISO 15 boundary values. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Speed planning uses two different ceilings: 4,300 r/min thermal reference and 6,000 r/min mechanical limiting speed. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 80 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.",
    "applications": [
      "paper-machine press and dryer rolls",
      "rolling-mill pinion and back-up shafts",
      "large vibrating screens and feeders",
      "marine propulsion and thruster shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Mount the 80 mm bore 22216 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 22200-series series at 80 mm bore (140×33 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.",
      "The 22216 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 243/270 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 22216 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 243/270 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 243/270 kN ratings are SKF catalogue values for this exact execution (22216 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 22216 (cylindrical bore as listed, tapered-bore 22216 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22216 E designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22216?",
        "a": "The 22216 E is a double-row spherical roller bearing with 80 mm bore, 140 mm outer diameter and 33 mm width (3.15 × 5.512 × 1.299 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 243 kN, C0 270 kN, fatigue load limit Pu 29 kN, reference speed 4,300 r/min, limiting speed 6,000 r/min, mass about 2100 g. It is an open, self-aligning bearing with a stamped window-type steel cage."
      },
      {
        "q": "How does the 22216 bore code work?",
        "a": "The last two digits of 22216 are bore code 16, so 16 × 5 = 80 mm bore. The 140 mm OD and 33 mm width come from the ISO 15 dimension-series plan (dimension series 22 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the E suffix mean on 22216?",
        "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves."
      },
      {
        "q": "Can 22216 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 22216K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22216 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22216-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H316 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C2216",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2216 shares the 80×140×33 mm envelope but catalogue C/C0 differ (220/250 kN vs 243/270 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C2216-K",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2216 K shares the 80×140×33 mm envelope but catalogue C/C0 differ (220/250 kN vs 243/270 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C2216-V",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2216 V shares the 80×140×33 mm envelope but catalogue C/C0 differ (255/305 kN vs 243/270 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C2216-KV",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2216 KV shares the 80×140×33 mm envelope but catalogue C/C0 differ (255/305 kN vs 243/270 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22216",
      "22216 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22217",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22217 E",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 85,
    "D_mm": 150,
    "B_mm": 36,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 291,
    "static_load_kN": 325,
    "fatigue_load_limit_kN": 34.5,
    "max_rpm": 5600,
    "reference_speed_rpm": 4000,
    "limiting_speed_rpm": 5600,
    "weight_g": 2700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF 22217 (22217 E) is the spherical-roller choice for a 85 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 150×36 mm ISO 15 envelope. Numbering ties the bearing to its envelope: 22217 means spherical-roller type, dimension series 22, 85 mm bore — which is why the 150×36 mm outline swaps dimensionally with other ISO 15 bearings of the same code. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. With C 291 kN and C0 325 kN, the 22217 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. A 85 mm rotating inner ring usually runs k5 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.",
    "applications": [
      "large vibrating screens and feeders",
      "marine propulsion and thruster shafts",
      "cement-mill trunnion and drive shafts",
      "heavy conveyor head shafts in mining"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Mount the 85 mm bore 22217 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 22200-series series at 85 mm bore (150×36 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.",
      "Shaft and housing fillets must clear the bearing chamfer so the 36 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "Shaft and housing fillets must clear the bearing chamfer so the 36 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 291/325 kN ratings are SKF catalogue values for this exact execution (22217 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 22217 (cylindrical bore as listed, tapered-bore 22217 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22217 E designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22217?",
        "a": "The 22217 E is a double-row spherical roller bearing with 85 mm bore, 150 mm outer diameter and 36 mm width (3.346 × 5.906 × 1.417 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 291 kN, C0 325 kN, fatigue load limit Pu 34.5 kN, reference speed 4,000 r/min, limiting speed 5,600 r/min, mass about 2700 g. It is an open, self-aligning bearing with a stamped window-type steel cage."
      },
      {
        "q": "How does the 22217 bore code work?",
        "a": "The last two digits of 22217 are bore code 17, so 17 × 5 = 85 mm bore. The 150 mm OD and 36 mm width come from the ISO 15 dimension-series plan (dimension series 22 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the E suffix mean on 22217?",
        "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves."
      },
      {
        "q": "Can 22217 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 22217K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22217 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22217-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H317 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C2217",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2217 shares the 85×150×36 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C2217-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2217 K shares the 85×150×36 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22217",
      "22217 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22218",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22218 E",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 90,
    "D_mm": 160,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 331,
    "static_load_kN": 375,
    "fatigue_load_limit_kN": 39,
    "max_rpm": 5300,
    "reference_speed_rpm": 3800,
    "limiting_speed_rpm": 5300,
    "weight_g": 3400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number 22218 E in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 90 mm shaft, dimension series 22 (medium OD, wide), with open execution and a stamped window-type steel cage. On the SKF nameplate, 22218 follows the ISO 15 convention: 2 for the spherical roller type, 22 for the dimension series 22 (medium OD, wide), final digits 18 for the 90 mm bore. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. The 39 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.13 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. After mounting, swing the outer ring to confirm free self-alignment: the 22218 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.",
    "applications": [
      "cement-mill trunnion and drive shafts",
      "heavy conveyor head shafts in mining",
      "jaw and cone crusher main shafts",
      "paper-machine press and dryer rolls"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "smearing on the roller-raceway contact during skid starts below the minimum load"
    ],
    "pitfalls": [
      "Mount the 90 mm bore 22218 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 22200-series series at 90 mm bore (160×40 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.",
      "The 3400 g mass and 40 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 22218.",
      "The 3400 g mass and 40 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 22218.",
      "The 331/375 kN ratings are SKF catalogue values for this exact execution (22218 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 22218 (cylindrical bore as listed, tapered-bore 22218 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22218 E designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22218?",
        "a": "The 22218 E is a double-row spherical roller bearing with 90 mm bore, 160 mm outer diameter and 40 mm width (3.543 × 6.299 × 1.575 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 331 kN, C0 375 kN, fatigue load limit Pu 39 kN, reference speed 3,800 r/min, limiting speed 5,300 r/min, mass about 3400 g. It is an open, self-aligning bearing with a stamped window-type steel cage."
      },
      {
        "q": "How does the 22218 bore code work?",
        "a": "The last two digits of 22218 are bore code 18, so 18 × 5 = 90 mm bore. The 160 mm OD and 40 mm width come from the ISO 15 dimension-series plan (dimension series 22 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the E suffix mean on 22218?",
        "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves."
      },
      {
        "q": "Can 22218 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 22218K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22218 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22218-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H318 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C2218",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2218 shares the 90×160×40 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C2218-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2218 K shares the 90×160×40 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22218",
      "22218 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22219",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22219 E",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 95,
    "D_mm": 170,
    "B_mm": 43,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 393,
    "static_load_kN": 450,
    "fatigue_load_limit_kN": 45.5,
    "max_rpm": 4800,
    "reference_speed_rpm": 3600,
    "limiting_speed_rpm": 4800,
    "weight_g": 4150,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22219 is a double-row spherical roller bearing in the 22200-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. The code breaks down as type digit 2 (double-row spherical roller), dimension series 22 (dimension series 22 (medium OD, wide)), and bore code 19 = 95 mm; dimensions 95×170×43 mm therefore match the ISO 15 envelope. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Selection arithmetic: the C0/C ratio is about 1.15 (static 450 kN against dynamic 393 kN), typical of a spherical roller sized for heavy combined loads, and the 45.5 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 22219 EK variant instead and measure the drive-up or clearance reduction, not the nut torque.",
    "applications": [
      "jaw and cone crusher main shafts",
      "paper-machine press and dryer rolls",
      "rolling-mill pinion and back-up shafts",
      "large vibrating screens and feeders"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals"
    ],
    "pitfalls": [
      "Mount the 95 mm bore 22219 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 22200-series series at 95 mm bore (170×43 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 22219; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 22219; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 393/450 kN ratings are SKF catalogue values for this exact execution (22219 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 22219 (cylindrical bore as listed, tapered-bore 22219 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22219 E designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22219?",
        "a": "The 22219 E is a double-row spherical roller bearing with 95 mm bore, 170 mm outer diameter and 43 mm width (3.74 × 6.693 × 1.693 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 393 kN, C0 450 kN, fatigue load limit Pu 45.5 kN, reference speed 3,600 r/min, limiting speed 4,800 r/min, mass about 4150 g. It is an open, self-aligning bearing with a stamped window-type steel cage."
      },
      {
        "q": "How does the 22219 bore code work?",
        "a": "The last two digits of 22219 are bore code 19, so 19 × 5 = 95 mm bore. The 170 mm OD and 43 mm width come from the ISO 15 dimension-series plan (dimension series 22 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the E suffix mean on 22219?",
        "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves."
      },
      {
        "q": "Can 22219 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 22219K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22219 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22219-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H319 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22219",
      "22219 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22220",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22220 E",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 100,
    "D_mm": 180,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 433,
    "static_load_kN": 490,
    "fatigue_load_limit_kN": 49,
    "max_rpm": 4500,
    "reference_speed_rpm": 3400,
    "limiting_speed_rpm": 4500,
    "weight_g": 4900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22220 E is a 100×180×46 mm spherical roller bearing — the dimension series 22 (medium OD, wide) entry for a 100 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. Numbering ties the bearing to its envelope: 22220 means spherical-roller type, dimension series 22, 100 mm bore — which is why the 180×46 mm outline swaps dimensionally with other ISO 15 bearings of the same code. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Catalogue mass 4900 g for the 100×180×46 mm open execution covers the a stamped window-type steel cage; tapered-bore and sealed variants differ in mass and carry their own order numbers. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 100 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.",
    "applications": [
      "marine propulsion and thruster shafts",
      "cement-mill trunnion and drive shafts",
      "heavy conveyor head shafts in mining",
      "jaw and cone crusher main shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals"
    ],
    "pitfalls": [
      "Mount the 100 mm bore 22220 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 22200-series series at 100 mm bore (180×46 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 22220; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 4900 g mass and 46 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 22220.",
      "The 433/490 kN ratings are SKF catalogue values for this exact execution (22220 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 22220 (cylindrical bore as listed, tapered-bore 22220 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22220 E designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22220?",
        "a": "The 22220 E is a double-row spherical roller bearing with 100 mm bore, 180 mm outer diameter and 46 mm width (3.937 × 7.087 × 1.811 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 433 kN, C0 490 kN, fatigue load limit Pu 49 kN, reference speed 3,400 r/min, limiting speed 4,500 r/min, mass about 4900 g. It is an open, self-aligning bearing with a stamped window-type steel cage."
      },
      {
        "q": "How does the 22220 bore code work?",
        "a": "The last two digits of 22220 are bore code 20, so 20 × 5 = 100 mm bore. The 180 mm OD and 46 mm width come from the ISO 15 dimension-series plan (dimension series 22 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the E suffix mean on 22220?",
        "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves."
      },
      {
        "q": "Can 22220 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 22220K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22220 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22220-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H320 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C2220",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2220 shares the 100×180×46 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C2220-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2220 K shares the 100×180×46 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22220",
      "22220 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22222",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22222 E",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 200,
    "B_mm": 53,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 572,
    "static_load_kN": 640,
    "fatigue_load_limit_kN": 63,
    "max_rpm": 4000,
    "reference_speed_rpm": 3000,
    "limiting_speed_rpm": 4000,
    "weight_g": 7000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22222 E belongs to the SKF spherical roller range — the 110 mm bore entry in the 22200-series series (dimension series 22 (medium OD, wide)), dimensioned 200 mm OD and 53 mm wide. The code breaks down as type digit 2 (double-row spherical roller), dimension series 22 (dimension series 22 (medium OD, wide)), and bore code 22 = 110 mm; dimensions 110×200×53 mm therefore match the ISO 15 envelope. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Speed planning uses two different ceilings: 3,000 r/min thermal reference and 4,000 r/min mechanical limiting speed. After mounting, swing the outer ring to confirm free self-alignment: the 22222 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.",
    "applications": [
      "paper-machine press and dryer rolls",
      "rolling-mill pinion and back-up shafts",
      "large vibrating screens and feeders",
      "marine propulsion and thruster shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Mount the 110 mm bore 22222 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 22200-series series at 110 mm bore (200×53 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.",
      "Catalogue reference speed and limiting speed are different limits: the 3,000 r/min reference is a thermal criterion under load, while the 4,000 r/min limiting value is the mechanical ceiling — observe both.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 572/640 kN ratings are SKF catalogue values for this exact execution (22222 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 22222 (cylindrical bore as listed, tapered-bore 22222 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22222 E designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22222?",
        "a": "The 22222 E is a double-row spherical roller bearing with 110 mm bore, 200 mm outer diameter and 53 mm width (4.331 × 7.874 × 2.087 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 572 kN, C0 640 kN, fatigue load limit Pu 63 kN, reference speed 3,000 r/min, limiting speed 4,000 r/min, mass about 7000 g. It is an open, self-aligning bearing with a stamped window-type steel cage."
      },
      {
        "q": "How does the 22222 bore code work?",
        "a": "The last two digits of 22222 are bore code 22, so 22 × 5 = 110 mm bore. The 200 mm OD and 53 mm width come from the ISO 15 dimension-series plan (dimension series 22 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the E suffix mean on 22222?",
        "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves."
      },
      {
        "q": "Can 22222 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 22222K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22222 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22222-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H322 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C2222",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2222 shares the 110×200×53 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C2222-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2222 K shares the 110×200×53 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22222",
      "22222 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22224",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22224 E",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 215,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 652,
    "static_load_kN": 765,
    "fatigue_load_limit_kN": 73.5,
    "max_rpm": 3800,
    "reference_speed_rpm": 2800,
    "limiting_speed_rpm": 3800,
    "weight_g": 8700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF 22224 (22224 E) is the spherical-roller choice for a 120 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 215×58 mm ISO 15 envelope. Digit by digit, 22224 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 22, and bore reference 24 resolving to 120 mm; 215 mm OD and 58 mm width are the matching ISO 15 boundary values. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. The 73.5 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.17 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. Mount with the spherical bearing's self-alignment in mind: it compensates ≈ 0.5–2.5° of misalignment depending on series, but the shaft and housing seats still set the datum — a rotating inner ring on a 120 mm shaft typically takes a m6 seat with an H7 housing bore.",
    "applications": [
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals"
    ],
    "pitfalls": [
      "At 120 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 22200-series series at 120 mm bore (215×58 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.",
      "The 22224 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 652/765 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 22224 pits long before its L10 life.",
      "The 652/765 kN ratings are SKF catalogue values for this exact execution (22224 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 22224 (cylindrical bore as listed, tapered-bore 22224 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22224 E designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22224?",
        "a": "The 22224 E is a double-row spherical roller bearing with 120 mm bore, 215 mm outer diameter and 58 mm width (4.724 × 8.465 × 2.283 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 652 kN, C0 765 kN, fatigue load limit Pu 73.5 kN, reference speed 2,800 r/min, limiting speed 3,800 r/min, mass about 8700 g. It is an open, self-aligning bearing with a stamped window-type steel cage."
      },
      {
        "q": "How does the 22224 bore code work?",
        "a": "The last two digits of 22224 are bore code 24, so 24 × 5 = 120 mm bore. The 215 mm OD and 58 mm width come from the ISO 15 dimension-series plan (dimension series 22 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the E suffix mean on 22224?",
        "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves."
      },
      {
        "q": "Can 22224 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 22224K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22224 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22224-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on AHX3124 withdrawal sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22224",
      "22224 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22226",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22226 E",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 230,
    "B_mm": 64,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 758,
    "static_load_kN": 930,
    "fatigue_load_limit_kN": 88,
    "max_rpm": 3600,
    "reference_speed_rpm": 2600,
    "limiting_speed_rpm": 3600,
    "weight_g": 11000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22226 is a double-row spherical roller bearing in the 22200-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. On the SKF nameplate, 22226 follows the ISO 15 convention: 2 for the spherical roller type, 22 for the dimension series 22 (medium OD, wide), final digits 26 for the 130 mm bore. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. The 50.0 mm radial section height ((230−130)/2) and 11000 g catalogue mass frame a 130 mm bore bearing rated at 758 kN C — roughly 5.83 kN of dynamic capacity per millimetre of bore before application factors. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.",
    "applications": [
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "At 130 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 22200-series series at 130 mm bore (230×64 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.",
      "The 11000 g mass and 64 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 22226.",
      "Shaft and housing fillets must clear the bearing chamfer so the 64 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 758/930 kN ratings are SKF catalogue values for this exact execution (22226 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 22226 (cylindrical bore as listed, tapered-bore 22226 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22226 E designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22226?",
        "a": "The 22226 E is a double-row spherical roller bearing with 130 mm bore, 230 mm outer diameter and 64 mm width (5.118 × 9.055 × 2.52 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 758 kN, C0 930 kN, fatigue load limit Pu 88 kN, reference speed 2,600 r/min, limiting speed 3,600 r/min, mass about 11000 g. It is an open, self-aligning bearing with a stamped window-type steel cage."
      },
      {
        "q": "How does the 22226 bore code work?",
        "a": "The last two digits of 22226 are bore code 26, so 26 × 5 = 130 mm bore. The 230 mm OD and 64 mm width come from the ISO 15 dimension-series plan (dimension series 22 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the E suffix mean on 22226?",
        "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves."
      },
      {
        "q": "Can 22226 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 22226K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22226 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22226-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on AHX3126 withdrawal sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C2226",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2226 shares the 130×230×64 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C2226-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2226 K shares the 130×230×64 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22226",
      "22226 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22228",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22228 CC/W33",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 250,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 743,
    "static_load_kN": 900,
    "fatigue_load_limit_kN": 86.5,
    "max_rpm": 3200,
    "reference_speed_rpm": 2400,
    "limiting_speed_rpm": 3200,
    "weight_g": 14000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 22228 appears as 22228 CC/W33: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 140×250×68 mm to the ISO 15 boundary plan. Reading the designation: the leading 2 marks a spherical roller bearing, the 22 is the ISO 15 dimension series (dimension series 22 (medium OD, wide)), and the last two digits encode the 140 mm bore; the 250 mm OD and 68 mm width follow the ISO 15 general plan. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. At 2,400 r/min reference speed the 55.0 mm-section 22228 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 3,200 r/min as the mechanical ceiling. A 140 mm rotating inner ring usually runs m6 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.",
    "applications": [
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "wind-turbine main shaft support"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals"
    ],
    "pitfalls": [
      "At 140 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 22200-series series at 140 mm bore (250×68 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 22228; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 743/900 kN ratings are SKF catalogue values for this exact execution (22228 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 22228 (cylindrical bore as listed, tapered-bore 22228 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22228 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22228?",
        "a": "The 22228 CC/W33 is a double-row spherical roller bearing with 140 mm bore, 250 mm outer diameter and 68 mm width (5.512 × 9.843 × 2.677 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 743 kN, C0 900 kN, fatigue load limit Pu 86.5 kN, reference speed 2,400 r/min, limiting speed 3,200 r/min, mass about 14000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 22228 bore code work?",
        "a": "The last two digits of 22228 are bore code 28, so 28 × 5 = 140 mm bore. The 250 mm OD and 68 mm width come from the ISO 15 dimension-series plan (dimension series 22 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 22228?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 22228 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 22228K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22228 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22228-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on AHX3128 withdrawal sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C2228",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2228 shares the 140×250×68 mm envelope but catalogue C/C0 differ (830/1060 kN vs 743/900 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C2228-K",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2228 K shares the 140×250×68 mm envelope but catalogue C/C0 differ (830/1060 kN vs 743/900 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22228",
      "22228 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22230",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22230 CC/W33",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 270,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 898,
    "static_load_kN": 1080,
    "fatigue_load_limit_kN": 102,
    "max_rpm": 3000,
    "reference_speed_rpm": 2200,
    "limiting_speed_rpm": 3000,
    "weight_g": 18000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 150 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 22230 under catalogue execution 22230 CC/W33: two barrel-roller rows on a sphered outer raceway. The code breaks down as type digit 2 (double-row spherical roller), dimension series 22 (dimension series 22 (medium OD, wide)), and bore code 30 = 150 mm; dimensions 150×270×73 mm therefore match the ISO 15 envelope. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. The 102 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.20 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.",
    "applications": [
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "At 150 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 22200-series series at 150 mm bore (270×73 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.",
      "Catalogue reference speed and limiting speed are different limits: the 2,200 r/min reference is a thermal criterion under load, while the 3,000 r/min limiting value is the mechanical ceiling — observe both.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 22230; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 898/1080 kN ratings are SKF catalogue values for this exact execution (22230 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 22230 (cylindrical bore as listed, tapered-bore 22230 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22230 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22230?",
        "a": "The 22230 CC/W33 is a double-row spherical roller bearing with 150 mm bore, 270 mm outer diameter and 73 mm width (5.906 × 10.63 × 2.874 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 898 kN, C0 1080 kN, fatigue load limit Pu 102 kN, reference speed 2,200 r/min, limiting speed 3,000 r/min, mass about 18000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 22230 bore code work?",
        "a": "The last two digits of 22230 are bore code 30, so 30 × 5 = 150 mm bore. The 270 mm OD and 73 mm width come from the ISO 15 dimension-series plan (dimension series 22 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 22230?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 22230 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 22230K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22230 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22230-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H3130 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C2230",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2230 shares the 150×270×73 mm envelope but catalogue C/C0 differ (980/1220 kN vs 898/1080 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C2230-K",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2230 K shares the 150×270×73 mm envelope but catalogue C/C0 differ (980/1220 kN vs 898/1080 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22230",
      "22230 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22232",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22232 CC/W33",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1043,
    "static_load_kN": 1290,
    "fatigue_load_limit_kN": 118,
    "max_rpm": 2800,
    "reference_speed_rpm": 2000,
    "limiting_speed_rpm": 2800,
    "weight_g": 22500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number 22232 CC/W33 in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 160 mm shaft, dimension series 22 (medium OD, wide), with open execution and two pressed-steel cages with a floating guide ring. Digit by digit, 22232 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 22, and bore reference 32 resolving to 160 mm; 290 mm OD and 80 mm width are the matching ISO 15 boundary values. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. The 65.0 mm radial section height ((290−160)/2) and 22500 g catalogue mass frame a 160 mm bore bearing rated at 1043 kN C — roughly 6.52 kN of dynamic capacity per millimetre of bore before application factors. A 160 mm rotating inner ring usually runs m6 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.",
    "applications": [
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "smearing on the roller-raceway contact during skid starts below the minimum load"
    ],
    "pitfalls": [
      "At 160 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 22200-series series at 160 mm bore (290×80 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.",
      "The 22232 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 1043/1290 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "Catalogue reference speed and limiting speed are different limits: the 2,000 r/min reference is a thermal criterion under load, while the 2,800 r/min limiting value is the mechanical ceiling — observe both.",
      "The 1043/1290 kN ratings are SKF catalogue values for this exact execution (22232 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 22232 (cylindrical bore as listed, tapered-bore 22232 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22232 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22232?",
        "a": "The 22232 CC/W33 is a double-row spherical roller bearing with 160 mm bore, 290 mm outer diameter and 80 mm width (6.299 × 11.417 × 3.15 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1043 kN, C0 1290 kN, fatigue load limit Pu 118 kN, reference speed 2,000 r/min, limiting speed 2,800 r/min, mass about 22500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 22232 bore code work?",
        "a": "The last two digits of 22232 are bore code 32, so 32 × 5 = 160 mm bore. The 290 mm OD and 80 mm width come from the ISO 15 dimension-series plan (dimension series 22 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 22232?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 22232 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 22232K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22232 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22232-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H3132 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22232",
      "22232 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22308",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22308 E",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 155,
    "static_load_kN": 140,
    "fatigue_load_limit_kN": 15,
    "max_rpm": 8000,
    "reference_speed_rpm": 6000,
    "limiting_speed_rpm": 8000,
    "weight_g": 1050,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF 22308 (22308 E) is the spherical-roller choice for a 40 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 90×33 mm ISO 15 envelope. Reading the designation: the leading 2 marks a spherical roller bearing, the 23 is the ISO 15 dimension series (dimension series 23 (heavy OD, wide)), and the last two digits encode the 40 mm bore; the 90 mm OD and 33 mm width follow the ISO 15 general plan. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. The 25.0 mm radial section height ((90−40)/2) and 1050 g catalogue mass frame a 40 mm bore bearing rated at 155 kN C — roughly 3.88 kN of dynamic capacity per millimetre of bore before application factors. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 40 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.",
    "applications": [
      "industrial gearbox output shafts",
      "centrifugal pump and fan shafts",
      "hammer-mill and crusher rotors",
      "continuous-caster guide rolls"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems"
    ],
    "pitfalls": [
      "On this 40 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.",
      "The 22300-series series at 40 mm bore (90×33 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 8,000 r/min ceiling.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 155/140 kN ratings are SKF catalogue values for this exact execution (22308 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 22308 (cylindrical bore as listed, tapered-bore 22308 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22308 E designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22308?",
        "a": "The 22308 E is a double-row spherical roller bearing with 40 mm bore, 90 mm outer diameter and 33 mm width (1.575 × 3.543 × 1.299 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 155 kN, C0 140 kN, fatigue load limit Pu 15 kN, reference speed 6,000 r/min, limiting speed 8,000 r/min, mass about 1050 g. It is an open, self-aligning bearing with a stamped window-type steel cage."
      },
      {
        "q": "How does the 22308 bore code work?",
        "a": "The last two digits of 22308 are bore code 08, so 08 × 5 = 40 mm bore. The 90 mm OD and 33 mm width come from the ISO 15 dimension-series plan (dimension series 23 (heavy OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the E suffix mean on 22308?",
        "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves."
      },
      {
        "q": "Can 22308 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 22308K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22308 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22308-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H2308 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22308",
      "22308 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22309",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22309 E",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 36,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 190,
    "static_load_kN": 183,
    "fatigue_load_limit_kN": 19.6,
    "max_rpm": 7000,
    "reference_speed_rpm": 5300,
    "limiting_speed_rpm": 7000,
    "weight_g": 1400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number 22309 E in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 45 mm shaft, dimension series 23 (heavy OD, wide), with open execution and a stamped window-type steel cage. Digit by digit, 22309 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 23, and bore reference 09 resolving to 45 mm; 100 mm OD and 36 mm width are the matching ISO 15 boundary values. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. Catalogue mass 1400 g for the 45×100×36 mm open execution covers the a stamped window-type steel cage; tapered-bore and sealed variants differ in mass and carry their own order numbers. A 45 mm rotating inner ring usually runs k5 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.",
    "applications": [
      "hammer-mill and crusher rotors",
      "continuous-caster guide rolls",
      "extruder gearbox shafts",
      "vibrating screen and scalper main shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "On this 45 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.",
      "The 22300-series series at 45 mm bore (100×36 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 7,000 r/min ceiling.",
      "Catalogue reference speed and limiting speed are different limits: the 5,300 r/min reference is a thermal criterion under load, while the 7,000 r/min limiting value is the mechanical ceiling — observe both.",
      "Catalogue reference speed and limiting speed are different limits: the 5,300 r/min reference is a thermal criterion under load, while the 7,000 r/min limiting value is the mechanical ceiling — observe both.",
      "The 190/183 kN ratings are SKF catalogue values for this exact execution (22309 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 22309 (cylindrical bore as listed, tapered-bore 22309 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22309 E designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22309?",
        "a": "The 22309 E is a double-row spherical roller bearing with 45 mm bore, 100 mm outer diameter and 36 mm width (1.772 × 3.937 × 1.417 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 190 kN, C0 183 kN, fatigue load limit Pu 19.6 kN, reference speed 5,300 r/min, limiting speed 7,000 r/min, mass about 1400 g. It is an open, self-aligning bearing with a stamped window-type steel cage."
      },
      {
        "q": "How does the 22309 bore code work?",
        "a": "The last two digits of 22309 are bore code 09, so 09 × 5 = 45 mm bore. The 100 mm OD and 36 mm width come from the ISO 15 dimension-series plan (dimension series 23 (heavy OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the E suffix mean on 22309?",
        "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves."
      },
      {
        "q": "Can 22309 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 22309K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22309 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22309-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H2309 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22309",
      "22309 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22310",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22310 E",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 228,
    "static_load_kN": 224,
    "fatigue_load_limit_kN": 24,
    "max_rpm": 6300,
    "reference_speed_rpm": 4800,
    "limiting_speed_rpm": 6300,
    "weight_g": 1900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22310 is a double-row spherical roller bearing in the 22300-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. The code breaks down as type digit 2 (double-row spherical roller), dimension series 23 (dimension series 23 (heavy OD, wide)), and bore code 10 = 50 mm; dimensions 50×110×40 mm therefore match the ISO 15 envelope. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. Speed planning uses two different ceilings: 4,800 r/min thermal reference and 6,300 r/min mechanical limiting speed. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 40 mm width across two roller rows needs the full charge.",
    "applications": [
      "conveyor drive and bend pulleys",
      "industrial gearbox output shafts",
      "centrifugal pump and fan shafts",
      "hammer-mill and crusher rotors"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "On this 50 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.",
      "The 22300-series series at 50 mm bore (110×40 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 6,300 r/min ceiling.",
      "Catalogue reference speed and limiting speed are different limits: the 4,800 r/min reference is a thermal criterion under load, while the 6,300 r/min limiting value is the mechanical ceiling — observe both.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 228/224 kN ratings are SKF catalogue values for this exact execution (22310 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 22310 (cylindrical bore as listed, tapered-bore 22310 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22310 E designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22310?",
        "a": "The 22310 E is a double-row spherical roller bearing with 50 mm bore, 110 mm outer diameter and 40 mm width (1.969 × 4.331 × 1.575 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 228 kN, C0 224 kN, fatigue load limit Pu 24 kN, reference speed 4,800 r/min, limiting speed 6,300 r/min, mass about 1900 g. It is an open, self-aligning bearing with a stamped window-type steel cage."
      },
      {
        "q": "How does the 22310 bore code work?",
        "a": "The last two digits of 22310 are bore code 10, so 10 × 5 = 50 mm bore. The 110 mm OD and 40 mm width come from the ISO 15 dimension-series plan (dimension series 23 (heavy OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the E suffix mean on 22310?",
        "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves."
      },
      {
        "q": "Can 22310 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 22310K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22310 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22310-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H2310 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22310",
      "22310 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22311",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22311 E",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 43,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 280,
    "static_load_kN": 280,
    "fatigue_load_limit_kN": 30,
    "max_rpm": 5600,
    "reference_speed_rpm": 4300,
    "limiting_speed_rpm": 5600,
    "weight_g": 2450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22311 E is a 55×120×43 mm spherical roller bearing — the dimension series 23 (heavy OD, wide) entry for a 55 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. Reading the designation: the leading 2 marks a spherical roller bearing, the 23 is the ISO 15 dimension series (dimension series 23 (heavy OD, wide)), and the last two digits encode the 55 mm bore; the 120 mm OD and 43 mm width follow the ISO 15 general plan. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. With C 280 kN and C0 280 kN, the 22311 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.",
    "applications": [
      "centrifugal pump and fan shafts",
      "hammer-mill and crusher rotors",
      "continuous-caster guide rolls",
      "extruder gearbox shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "On this 55 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.",
      "The 22300-series series at 55 mm bore (120×43 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 5,600 r/min ceiling.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 22311 pits long before its L10 life.",
      "Catalogue reference speed and limiting speed are different limits: the 4,300 r/min reference is a thermal criterion under load, while the 5,600 r/min limiting value is the mechanical ceiling — observe both.",
      "The 280/280 kN ratings are SKF catalogue values for this exact execution (22311 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 22311 (cylindrical bore as listed, tapered-bore 22311 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22311 E designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22311?",
        "a": "The 22311 E is a double-row spherical roller bearing with 55 mm bore, 120 mm outer diameter and 43 mm width (2.165 × 4.724 × 1.693 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 280 kN, C0 280 kN, fatigue load limit Pu 30 kN, reference speed 4,300 r/min, limiting speed 5,600 r/min, mass about 2450 g. It is an open, self-aligning bearing with a stamped window-type steel cage."
      },
      {
        "q": "How does the 22311 bore code work?",
        "a": "The last two digits of 22311 are bore code 11, so 11 × 5 = 55 mm bore. The 120 mm OD and 43 mm width come from the ISO 15 dimension-series plan (dimension series 23 (heavy OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the E suffix mean on 22311?",
        "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves."
      },
      {
        "q": "Can 22311 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 22311K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22311 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22311-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H2311 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22311",
      "22311 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22312",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22312 E",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 60,
    "D_mm": 130,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 325,
    "static_load_kN": 335,
    "fatigue_load_limit_kN": 36,
    "max_rpm": 5300,
    "reference_speed_rpm": 4000,
    "limiting_speed_rpm": 5300,
    "weight_g": 3100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 22312 appears as 22312 E: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 60×130×46 mm to the ISO 15 boundary plan. Digit by digit, 22312 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 23, and bore reference 12 resolving to 60 mm; 130 mm OD and 46 mm width are the matching ISO 15 boundary values. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. The 36 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.03 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 60 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.",
    "applications": [
      "cement-mill trunnion and drive shafts",
      "heavy conveyor head shafts in mining",
      "jaw and cone crusher main shafts",
      "paper-machine press and dryer rolls"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still"
    ],
    "pitfalls": [
      "Mount the 60 mm bore 22312 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 22300-series series at 60 mm bore (130×46 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 5,300 r/min ceiling.",
      "The 22312 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 325/335 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 22312 pits long before its L10 life.",
      "The 325/335 kN ratings are SKF catalogue values for this exact execution (22312 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 22312 (cylindrical bore as listed, tapered-bore 22312 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22312 E designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22312?",
        "a": "The 22312 E is a double-row spherical roller bearing with 60 mm bore, 130 mm outer diameter and 46 mm width (2.362 × 5.118 × 1.811 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 325 kN, C0 335 kN, fatigue load limit Pu 36 kN, reference speed 4,000 r/min, limiting speed 5,300 r/min, mass about 3100 g. It is an open, self-aligning bearing with a stamped window-type steel cage."
      },
      {
        "q": "How does the 22312 bore code work?",
        "a": "The last two digits of 22312 are bore code 12, so 12 × 5 = 60 mm bore. The 130 mm OD and 46 mm width come from the ISO 15 dimension-series plan (dimension series 23 (heavy OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the E suffix mean on 22312?",
        "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves."
      },
      {
        "q": "Can 22312 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 22312K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22312 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22312-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H2312 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22312",
      "22312 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22313",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22313 E",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 65,
    "D_mm": 140,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 357,
    "static_load_kN": 360,
    "fatigue_load_limit_kN": 38,
    "max_rpm": 5000,
    "reference_speed_rpm": 3800,
    "limiting_speed_rpm": 5000,
    "weight_g": 3750,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22313 E belongs to the SKF spherical roller range — the 65 mm bore entry in the 22300-series series (dimension series 23 (heavy OD, wide)), dimensioned 140 mm OD and 48 mm wide. Numbering ties the bearing to its envelope: 22313 means spherical-roller type, dimension series 23, 65 mm bore — which is why the 140×48 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. Selection arithmetic: the C0/C ratio is about 1.01 (static 360 kN against dynamic 357 kN), typical of a spherical roller sized for heavy combined loads, and the 38 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. A 65 mm rotating inner ring usually runs k5 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.",
    "applications": [
      "jaw and cone crusher main shafts",
      "paper-machine press and dryer rolls",
      "rolling-mill pinion and back-up shafts",
      "large vibrating screens and feeders"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems"
    ],
    "pitfalls": [
      "Mount the 65 mm bore 22313 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 22300-series series at 65 mm bore (140×48 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 5,000 r/min ceiling.",
      "Shaft and housing fillets must clear the bearing chamfer so the 48 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 22313 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 357/360 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 357/360 kN ratings are SKF catalogue values for this exact execution (22313 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 22313 (cylindrical bore as listed, tapered-bore 22313 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22313 E designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22313?",
        "a": "The 22313 E is a double-row spherical roller bearing with 65 mm bore, 140 mm outer diameter and 48 mm width (2.559 × 5.512 × 1.89 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 357 kN, C0 360 kN, fatigue load limit Pu 38 kN, reference speed 3,800 r/min, limiting speed 5,000 r/min, mass about 3750 g. It is an open, self-aligning bearing with a stamped window-type steel cage."
      },
      {
        "q": "How does the 22313 bore code work?",
        "a": "The last two digits of 22313 are bore code 13, so 13 × 5 = 65 mm bore. The 140 mm OD and 48 mm width come from the ISO 15 dimension-series plan (dimension series 23 (heavy OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the E suffix mean on 22313?",
        "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves."
      },
      {
        "q": "Can 22313 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 22313K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22313 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22313-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H2313 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22313",
      "22313 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22314",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22314 E",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 70,
    "D_mm": 150,
    "B_mm": 51,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 413,
    "static_load_kN": 430,
    "fatigue_load_limit_kN": 45,
    "max_rpm": 4500,
    "reference_speed_rpm": 3400,
    "limiting_speed_rpm": 4500,
    "weight_g": 4550,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 70 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 22314 under catalogue execution 22314 E: two barrel-roller rows on a sphered outer raceway. On the SKF nameplate, 22314 follows the ISO 15 convention: 2 for the spherical roller type, 23 for the dimension series 23 (heavy OD, wide), final digits 14 for the 70 mm bore. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. The 40.0 mm radial section height ((150−70)/2) and 4550 g catalogue mass frame a 70 mm bore bearing rated at 413 kN C — roughly 5.90 kN of dynamic capacity per millimetre of bore before application factors. After mounting, swing the outer ring to confirm free self-alignment: the 22314 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.",
    "applications": [
      "rolling-mill pinion and back-up shafts",
      "large vibrating screens and feeders",
      "marine propulsion and thruster shafts",
      "cement-mill trunnion and drive shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Mount the 70 mm bore 22314 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 22300-series series at 70 mm bore (150×51 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 4,500 r/min ceiling.",
      "The 4550 g mass and 51 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 22314.",
      "Shaft and housing fillets must clear the bearing chamfer so the 51 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 413/430 kN ratings are SKF catalogue values for this exact execution (22314 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 22314 (cylindrical bore as listed, tapered-bore 22314 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22314 E designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22314?",
        "a": "The 22314 E is a double-row spherical roller bearing with 70 mm bore, 150 mm outer diameter and 51 mm width (2.756 × 5.906 × 2.008 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 413 kN, C0 430 kN, fatigue load limit Pu 45 kN, reference speed 3,400 r/min, limiting speed 4,500 r/min, mass about 4550 g. It is an open, self-aligning bearing with a stamped window-type steel cage."
      },
      {
        "q": "How does the 22314 bore code work?",
        "a": "The last two digits of 22314 are bore code 14, so 14 × 5 = 70 mm bore. The 150 mm OD and 51 mm width come from the ISO 15 dimension-series plan (dimension series 23 (heavy OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the E suffix mean on 22314?",
        "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves."
      },
      {
        "q": "Can 22314 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 22314K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22314 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22314-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H2314 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C2314",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2314 shares the 70×150×51 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C2314-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2314 K shares the 70×150×51 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22314",
      "22314 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22315",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22315 E",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 75,
    "D_mm": 160,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 462,
    "static_load_kN": 475,
    "fatigue_load_limit_kN": 48,
    "max_rpm": 4300,
    "reference_speed_rpm": 3200,
    "limiting_speed_rpm": 4300,
    "weight_g": 5550,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF 22315 (22315 E) is the spherical-roller choice for a 75 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 160×55 mm ISO 15 envelope. The code breaks down as type digit 2 (double-row spherical roller), dimension series 23 (dimension series 23 (heavy OD, wide)), and bore code 15 = 75 mm; dimensions 75×160×55 mm therefore match the ISO 15 envelope. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. Catalogue mass 5550 g for the 75×160×55 mm open execution covers the a stamped window-type steel cage; tapered-bore and sealed variants differ in mass and carry their own order numbers. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 22315 EK variant instead and measure the drive-up or clearance reduction, not the nut torque.",
    "applications": [
      "marine propulsion and thruster shafts",
      "cement-mill trunnion and drive shafts",
      "heavy conveyor head shafts in mining",
      "jaw and cone crusher main shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Mount the 75 mm bore 22315 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 22300-series series at 75 mm bore (160×55 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 4,300 r/min ceiling.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 22315; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 5550 g mass and 55 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 22315.",
      "The 462/475 kN ratings are SKF catalogue values for this exact execution (22315 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 22315 (cylindrical bore as listed, tapered-bore 22315 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22315 E designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22315?",
        "a": "The 22315 E is a double-row spherical roller bearing with 75 mm bore, 160 mm outer diameter and 55 mm width (2.953 × 6.299 × 2.165 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 462 kN, C0 475 kN, fatigue load limit Pu 48 kN, reference speed 3,200 r/min, limiting speed 4,300 r/min, mass about 5550 g. It is an open, self-aligning bearing with a stamped window-type steel cage."
      },
      {
        "q": "How does the 22315 bore code work?",
        "a": "The last two digits of 22315 are bore code 15, so 15 × 5 = 75 mm bore. The 160 mm OD and 55 mm width come from the ISO 15 dimension-series plan (dimension series 23 (heavy OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the E suffix mean on 22315?",
        "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves."
      },
      {
        "q": "Can 22315 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 22315K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22315 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22315-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H2315 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C2315",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2315 shares the 75×160×55 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C2315-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2315 K shares the 75×160×55 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22315",
      "22315 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22316",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22316 E",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 80,
    "D_mm": 170,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 516,
    "static_load_kN": 530,
    "fatigue_load_limit_kN": 54,
    "max_rpm": 4000,
    "reference_speed_rpm": 3000,
    "limiting_speed_rpm": 4000,
    "weight_g": 6600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number 22316 E in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 80 mm shaft, dimension series 23 (heavy OD, wide), with open execution and a stamped window-type steel cage. Reading the designation: the leading 2 marks a spherical roller bearing, the 23 is the ISO 15 dimension series (dimension series 23 (heavy OD, wide)), and the last two digits encode the 80 mm bore; the 170 mm OD and 58 mm width follow the ISO 15 general plan. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. At 3,000 r/min reference speed the 45.0 mm-section 22316 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 4,000 r/min as the mechanical ceiling. Mount with the spherical bearing's self-alignment in mind: it compensates ≈ 0.5–2.5° of misalignment depending on series, but the shaft and housing seats still set the datum — a rotating inner ring on a 80 mm shaft typically takes a k5 seat with an H7 housing bore.",
    "applications": [
      "heavy conveyor head shafts in mining",
      "jaw and cone crusher main shafts",
      "paper-machine press and dryer rolls",
      "rolling-mill pinion and back-up shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still"
    ],
    "pitfalls": [
      "Mount the 80 mm bore 22316 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 22300-series series at 80 mm bore (170×58 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 4,000 r/min ceiling.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 22316; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 516/530 kN ratings are SKF catalogue values for this exact execution (22316 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 22316 (cylindrical bore as listed, tapered-bore 22316 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22316 E designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22316?",
        "a": "The 22316 E is a double-row spherical roller bearing with 80 mm bore, 170 mm outer diameter and 58 mm width (3.15 × 6.693 × 2.283 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 516 kN, C0 530 kN, fatigue load limit Pu 54 kN, reference speed 3,000 r/min, limiting speed 4,000 r/min, mass about 6600 g. It is an open, self-aligning bearing with a stamped window-type steel cage."
      },
      {
        "q": "How does the 22316 bore code work?",
        "a": "The last two digits of 22316 are bore code 16, so 16 × 5 = 80 mm bore. The 170 mm OD and 58 mm width come from the ISO 15 dimension-series plan (dimension series 23 (heavy OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the E suffix mean on 22316?",
        "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves."
      },
      {
        "q": "Can 22316 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 22316K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22316 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22316-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H2316 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C2316",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2316 shares the 80×170×58 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C2316-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2316 K shares the 80×170×58 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22316",
      "22316 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22317",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22317 E",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 85,
    "D_mm": 180,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 577,
    "static_load_kN": 620,
    "fatigue_load_limit_kN": 61,
    "max_rpm": 3800,
    "reference_speed_rpm": 2800,
    "limiting_speed_rpm": 3800,
    "weight_g": 7650,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22317 is a double-row spherical roller bearing in the 22300-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. Digit by digit, 22317 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 23, and bore reference 17 resolving to 85 mm; 180 mm OD and 60 mm width are the matching ISO 15 boundary values. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. Speed planning uses two different ceilings: 2,800 r/min thermal reference and 3,800 r/min mechanical limiting speed. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 60 mm width across two roller rows needs the full charge.",
    "applications": [
      "paper-machine press and dryer rolls",
      "rolling-mill pinion and back-up shafts",
      "large vibrating screens and feeders",
      "marine propulsion and thruster shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems"
    ],
    "pitfalls": [
      "Mount the 85 mm bore 22317 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 22300-series series at 85 mm bore (180×60 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 3,800 r/min ceiling.",
      "Catalogue reference speed and limiting speed are different limits: the 2,800 r/min reference is a thermal criterion under load, while the 3,800 r/min limiting value is the mechanical ceiling — observe both.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 577/620 kN ratings are SKF catalogue values for this exact execution (22317 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 22317 (cylindrical bore as listed, tapered-bore 22317 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22317 E designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22317?",
        "a": "The 22317 E is a double-row spherical roller bearing with 85 mm bore, 180 mm outer diameter and 60 mm width (3.346 × 7.087 × 2.362 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 577 kN, C0 620 kN, fatigue load limit Pu 61 kN, reference speed 2,800 r/min, limiting speed 3,800 r/min, mass about 7650 g. It is an open, self-aligning bearing with a stamped window-type steel cage."
      },
      {
        "q": "How does the 22317 bore code work?",
        "a": "The last two digits of 22317 are bore code 17, so 17 × 5 = 85 mm bore. The 180 mm OD and 60 mm width come from the ISO 15 dimension-series plan (dimension series 23 (heavy OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the E suffix mean on 22317?",
        "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves."
      },
      {
        "q": "Can 22317 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 22317K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22317 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22317-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H2317 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C2317",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2317 shares the 85×180×60 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C2317-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2317 K shares the 85×180×60 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22317",
      "22317 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22318",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22318 E",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 90,
    "D_mm": 190,
    "B_mm": 64,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 637,
    "static_load_kN": 695,
    "fatigue_load_limit_kN": 67,
    "max_rpm": 3600,
    "reference_speed_rpm": 2600,
    "limiting_speed_rpm": 3600,
    "weight_g": 9050,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22318 E is a 90×190×64 mm spherical roller bearing — the dimension series 23 (heavy OD, wide) entry for a 90 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. Numbering ties the bearing to its envelope: 22318 means spherical-roller type, dimension series 23, 90 mm bore — which is why the 190×64 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. With C 637 kN and C0 695 kN, the 22318 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.",
    "applications": [
      "large vibrating screens and feeders",
      "marine propulsion and thruster shafts",
      "cement-mill trunnion and drive shafts",
      "heavy conveyor head shafts in mining"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Mount the 90 mm bore 22318 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 22300-series series at 90 mm bore (190×64 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 3,600 r/min ceiling.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 22318 pits long before its L10 life.",
      "Catalogue reference speed and limiting speed are different limits: the 2,600 r/min reference is a thermal criterion under load, while the 3,600 r/min limiting value is the mechanical ceiling — observe both.",
      "The 637/695 kN ratings are SKF catalogue values for this exact execution (22318 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 22318 (cylindrical bore as listed, tapered-bore 22318 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22318 E designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22318?",
        "a": "The 22318 E is a double-row spherical roller bearing with 90 mm bore, 190 mm outer diameter and 64 mm width (3.543 × 7.48 × 2.52 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 637 kN, C0 695 kN, fatigue load limit Pu 67 kN, reference speed 2,600 r/min, limiting speed 3,600 r/min, mass about 9050 g. It is an open, self-aligning bearing with a stamped window-type steel cage."
      },
      {
        "q": "How does the 22318 bore code work?",
        "a": "The last two digits of 22318 are bore code 18, so 18 × 5 = 90 mm bore. The 190 mm OD and 64 mm width come from the ISO 15 dimension-series plan (dimension series 23 (heavy OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the E suffix mean on 22318?",
        "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves."
      },
      {
        "q": "Can 22318 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 22318K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22318 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22318-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H2318 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C2318",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2318 shares the 90×190×64 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C2318-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2318 K shares the 90×190×64 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22318",
      "22318 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22319",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22319 E",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 95,
    "D_mm": 200,
    "B_mm": 67,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 699,
    "static_load_kN": 765,
    "fatigue_load_limit_kN": 73.5,
    "max_rpm": 3400,
    "reference_speed_rpm": 2600,
    "limiting_speed_rpm": 3400,
    "weight_g": 10500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 22319 appears as 22319 E: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 95×200×67 mm to the ISO 15 boundary plan. On the SKF nameplate, 22319 follows the ISO 15 convention: 2 for the spherical roller type, 23 for the dimension series 23 (heavy OD, wide), final digits 19 for the 95 mm bore. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. The 73.5 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.09 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 95 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.",
    "applications": [
      "cement-mill trunnion and drive shafts",
      "heavy conveyor head shafts in mining",
      "jaw and cone crusher main shafts",
      "paper-machine press and dryer rolls"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Mount the 95 mm bore 22319 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 22300-series series at 95 mm bore (200×67 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 3,400 r/min ceiling.",
      "The 22319 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 699/765 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 22319 pits long before its L10 life.",
      "The 699/765 kN ratings are SKF catalogue values for this exact execution (22319 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 22319 (cylindrical bore as listed, tapered-bore 22319 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22319 E designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22319?",
        "a": "The 22319 E is a double-row spherical roller bearing with 95 mm bore, 200 mm outer diameter and 67 mm width (3.74 × 7.874 × 2.638 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 699 kN, C0 765 kN, fatigue load limit Pu 73.5 kN, reference speed 2,600 r/min, limiting speed 3,400 r/min, mass about 10500 g. It is an open, self-aligning bearing with a stamped window-type steel cage."
      },
      {
        "q": "How does the 22319 bore code work?",
        "a": "The last two digits of 22319 are bore code 19, so 19 × 5 = 95 mm bore. The 200 mm OD and 67 mm width come from the ISO 15 dimension-series plan (dimension series 23 (heavy OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the E suffix mean on 22319?",
        "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves."
      },
      {
        "q": "Can 22319 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 22319K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22319 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22319-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H2319 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C2319",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2319 shares the 95×200×67 mm envelope but catalogue C/C0 differ (610/695 kN vs 699/765 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C2319-K",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2319 K shares the 95×200×67 mm envelope but catalogue C/C0 differ (610/695 kN vs 699/765 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22319",
      "22319 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22320",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22320 E",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 100,
    "D_mm": 215,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 847,
    "static_load_kN": 950,
    "fatigue_load_limit_kN": 88,
    "max_rpm": 3000,
    "reference_speed_rpm": 2400,
    "limiting_speed_rpm": 3000,
    "weight_g": 13500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22320 E belongs to the SKF spherical roller range — the 100 mm bore entry in the 22300-series series (dimension series 23 (heavy OD, wide)), dimensioned 215 mm OD and 73 mm wide. Digit by digit, 22320 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 23, and bore reference 20 resolving to 100 mm; 215 mm OD and 73 mm width are the matching ISO 15 boundary values. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. The 57.5 mm radial section height ((215−100)/2) and 13500 g catalogue mass frame a 100 mm bore bearing rated at 847 kN C — roughly 8.47 kN of dynamic capacity per millimetre of bore before application factors. Mount with the spherical bearing's self-alignment in mind: it compensates ≈ 0.5–2.5° of misalignment depending on series, but the shaft and housing seats still set the datum — a rotating inner ring on a 100 mm shaft typically takes a k5 seat with an H7 housing bore.",
    "applications": [
      "rolling-mill pinion and back-up shafts",
      "large vibrating screens and feeders",
      "marine propulsion and thruster shafts",
      "cement-mill trunnion and drive shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Mount the 100 mm bore 22320 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 22300-series series at 100 mm bore (215×73 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 3,000 r/min ceiling.",
      "The 22320 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 847/950 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "Catalogue reference speed and limiting speed are different limits: the 2,400 r/min reference is a thermal criterion under load, while the 3,000 r/min limiting value is the mechanical ceiling — observe both.",
      "The 847/950 kN ratings are SKF catalogue values for this exact execution (22320 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 22320 (cylindrical bore as listed, tapered-bore 22320 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22320 E designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22320?",
        "a": "The 22320 E is a double-row spherical roller bearing with 100 mm bore, 215 mm outer diameter and 73 mm width (3.937 × 8.465 × 2.874 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 847 kN, C0 950 kN, fatigue load limit Pu 88 kN, reference speed 2,400 r/min, limiting speed 3,000 r/min, mass about 13500 g. It is an open, self-aligning bearing with a stamped window-type steel cage."
      },
      {
        "q": "How does the 22320 bore code work?",
        "a": "The last two digits of 22320 are bore code 20, so 20 × 5 = 100 mm bore. The 215 mm OD and 73 mm width come from the ISO 15 dimension-series plan (dimension series 23 (heavy OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the E suffix mean on 22320?",
        "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves."
      },
      {
        "q": "Can 22320 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 22320K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22320 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22320-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H2320 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C2320",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2320 shares the 100×215×73 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C2320-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2320 K shares the 100×215×73 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22320",
      "22320 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22322",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22322 E",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 240,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 989,
    "static_load_kN": 1120,
    "fatigue_load_limit_kN": 100,
    "max_rpm": 2800,
    "reference_speed_rpm": 2000,
    "limiting_speed_rpm": 2800,
    "weight_g": 18500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF 22322 (22322 E) is the spherical-roller choice for a 110 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 240×80 mm ISO 15 envelope. On the SKF nameplate, 22322 follows the ISO 15 convention: 2 for the spherical roller type, 23 for the dimension series 23 (heavy OD, wide), final digits 22 for the 110 mm bore. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. At 2,000 r/min reference speed the 65.0 mm-section 22322 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 2,800 r/min as the mechanical ceiling. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.",
    "applications": [
      "heavy conveyor head shafts in mining",
      "jaw and cone crusher main shafts",
      "paper-machine press and dryer rolls",
      "rolling-mill pinion and back-up shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems"
    ],
    "pitfalls": [
      "Mount the 110 mm bore 22322 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 22300-series series at 110 mm bore (240×80 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 2,800 r/min ceiling.",
      "The 18500 g mass and 80 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 22322.",
      "The 22322 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 989/1120 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 989/1120 kN ratings are SKF catalogue values for this exact execution (22322 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 22322 (cylindrical bore as listed, tapered-bore 22322 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22322 E designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22322?",
        "a": "The 22322 E is a double-row spherical roller bearing with 110 mm bore, 240 mm outer diameter and 80 mm width (4.331 × 9.449 × 3.15 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 989 kN, C0 1120 kN, fatigue load limit Pu 100 kN, reference speed 2,000 r/min, limiting speed 2,800 r/min, mass about 18500 g. It is an open, self-aligning bearing with a stamped window-type steel cage."
      },
      {
        "q": "How does the 22322 bore code work?",
        "a": "The last two digits of 22322 are bore code 22, so 22 × 5 = 110 mm bore. The 240 mm OD and 80 mm width come from the ISO 15 dimension-series plan (dimension series 23 (heavy OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the E suffix mean on 22322?",
        "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves."
      },
      {
        "q": "Can 22322 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 22322K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22322 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22322-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H2322 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22322",
      "22322 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22324",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22324 CC/W33",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 260,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1019,
    "static_load_kN": 1120,
    "fatigue_load_limit_kN": 100,
    "max_rpm": 2600,
    "reference_speed_rpm": 2000,
    "limiting_speed_rpm": 2600,
    "weight_g": 23000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22324 is a double-row spherical roller bearing in the 22300-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. Reading the designation: the leading 2 marks a spherical roller bearing, the 23 is the ISO 15 dimension series (dimension series 23 (heavy OD, wide)), and the last two digits encode the 120 mm bore; the 260 mm OD and 86 mm width follow the ISO 15 general plan. The suffix chain reads CC (two pressed-steel cages with a floating guide ring between the roller rows) plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK/W33 is the 1:12 tapered-bore counterpart. With C 1019 kN and C0 1120 kN, the 22324 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. A 120 mm rotating inner ring usually runs m6 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.",
    "applications": [
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At 120 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 22300-series series at 120 mm bore (260×86 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 2,600 r/min ceiling.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 23000 g mass and 86 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 22324.",
      "The 1019/1120 kN ratings are SKF catalogue values for this exact execution (22324 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 22324 (cylindrical bore as listed, tapered-bore 22324 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22324 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22324?",
        "a": "The 22324 CC/W33 is a double-row spherical roller bearing with 120 mm bore, 260 mm outer diameter and 86 mm width (4.724 × 10.236 × 3.386 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1019 kN, C0 1120 kN, fatigue load limit Pu 100 kN, reference speed 2,000 r/min, limiting speed 2,600 r/min, mass about 23000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 22324 bore code work?",
        "a": "The last two digits of 22324 are bore code 24, so 24 × 5 = 120 mm bore. The 260 mm OD and 86 mm width come from the ISO 15 dimension-series plan (dimension series 23 (heavy OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 22324?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 22324 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 22324K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22324 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22324-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on AHX2324 withdrawal sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22324",
      "22324 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22326",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22326 CC/W33",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 280,
    "B_mm": 93,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1176,
    "static_load_kN": 1320,
    "fatigue_load_limit_kN": 114,
    "max_rpm": 2400,
    "reference_speed_rpm": 1800,
    "limiting_speed_rpm": 2400,
    "weight_g": 29000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 22326 appears as 22326 CC/W33: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 130×280×93 mm to the ISO 15 boundary plan. Numbering ties the bearing to its envelope: 22326 means spherical-roller type, dimension series 23, 130 mm bore — which is why the 280×93 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The suffix chain reads CC (two pressed-steel cages with a floating guide ring between the roller rows) plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK/W33 is the 1:12 tapered-bore counterpart. Selection arithmetic: the C0/C ratio is about 1.12 (static 1320 kN against dynamic 1176 kN), typical of a spherical roller sized for heavy combined loads, and the 114 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 22326 CCK/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.",
    "applications": [
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems"
    ],
    "pitfalls": [
      "At 130 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 22300-series series at 130 mm bore (280×93 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 2,400 r/min ceiling.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 22326 pits long before its L10 life.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 1176/1320 kN ratings are SKF catalogue values for this exact execution (22326 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 22326 (cylindrical bore as listed, tapered-bore 22326 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22326 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22326?",
        "a": "The 22326 CC/W33 is a double-row spherical roller bearing with 130 mm bore, 280 mm outer diameter and 93 mm width (5.118 × 11.024 × 3.661 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1176 kN, C0 1320 kN, fatigue load limit Pu 114 kN, reference speed 1,800 r/min, limiting speed 2,400 r/min, mass about 29000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 22326 bore code work?",
        "a": "The last two digits of 22326 are bore code 26, so 26 × 5 = 130 mm bore. The 280 mm OD and 93 mm width come from the ISO 15 dimension-series plan (dimension series 23 (heavy OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 22326?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 22326 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 22326K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22326 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22326-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on AHX2326 withdrawal sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C2326-K-VE240",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2326 K/VE240 shares the 130×280×93 mm envelope but catalogue C/C0 differ (980/1220 kN vs 1176/1320 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22326",
      "22326 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22328",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22328 CC/W33",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 300,
    "B_mm": 102,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1357,
    "static_load_kN": 1560,
    "fatigue_load_limit_kN": 132,
    "max_rpm": 2200,
    "reference_speed_rpm": 1700,
    "limiting_speed_rpm": 2200,
    "weight_g": 36500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 140 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 22328 under catalogue execution 22328 CC/W33: two barrel-roller rows on a sphered outer raceway. The code breaks down as type digit 2 (double-row spherical roller), dimension series 23 (dimension series 23 (heavy OD, wide)), and bore code 28 = 140 mm; dimensions 140×300×102 mm therefore match the ISO 15 envelope. The suffix chain reads CC (two pressed-steel cages with a floating guide ring between the roller rows) plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK/W33 is the 1:12 tapered-bore counterpart. Catalogue mass 36500 g for the 140×300×102 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 102 mm width across two roller rows needs the full charge.",
    "applications": [
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At 140 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 22300-series series at 140 mm bore (300×102 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 2,200 r/min ceiling.",
      "Shaft and housing fillets must clear the bearing chamfer so the 102 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 22328 pits long before its L10 life.",
      "The 1357/1560 kN ratings are SKF catalogue values for this exact execution (22328 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 22328 (cylindrical bore as listed, tapered-bore 22328 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22328 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22328?",
        "a": "The 22328 CC/W33 is a double-row spherical roller bearing with 140 mm bore, 300 mm outer diameter and 102 mm width (5.512 × 11.811 × 4.016 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1357 kN, C0 1560 kN, fatigue load limit Pu 132 kN, reference speed 1,700 r/min, limiting speed 2,200 r/min, mass about 36500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 22328 bore code work?",
        "a": "The last two digits of 22328 are bore code 28, so 28 × 5 = 140 mm bore. The 300 mm OD and 102 mm width come from the ISO 15 dimension-series plan (dimension series 23 (heavy OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 22328?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 22328 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 22328K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22328 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22328-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on AHX2328 withdrawal sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22328",
      "22328 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22330",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22330 CC/W33",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 320,
    "B_mm": 108,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1539,
    "static_load_kN": 1760,
    "fatigue_load_limit_kN": 146,
    "max_rpm": 2000,
    "reference_speed_rpm": 1600,
    "limiting_speed_rpm": 2000,
    "weight_g": 43500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number 22330 CC/W33 in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 150 mm shaft, dimension series 23 (heavy OD, wide), with open execution and two pressed-steel cages with a floating guide ring. On the SKF nameplate, 22330 follows the ISO 15 convention: 2 for the spherical roller type, 23 for the dimension series 23 (heavy OD, wide), final digits 30 for the 150 mm bore. The suffix chain reads CC (two pressed-steel cages with a floating guide ring between the roller rows) plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK/W33 is the 1:12 tapered-bore counterpart. With C 1539 kN and C0 1760 kN, the 22330 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 22330 CCK/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.",
    "applications": [
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still"
    ],
    "pitfalls": [
      "At 150 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 22300-series series at 150 mm bore (320×108 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 2,000 r/min ceiling.",
      "The 43500 g mass and 108 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 22330.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 22330 pits long before its L10 life.",
      "The 1539/1760 kN ratings are SKF catalogue values for this exact execution (22330 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 22330 (cylindrical bore as listed, tapered-bore 22330 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22330 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22330?",
        "a": "The 22330 CC/W33 is a double-row spherical roller bearing with 150 mm bore, 320 mm outer diameter and 108 mm width (5.906 × 12.598 × 4.252 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1539 kN, C0 1760 kN, fatigue load limit Pu 146 kN, reference speed 1,600 r/min, limiting speed 2,000 r/min, mass about 43500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 22330 bore code work?",
        "a": "The last two digits of 22330 are bore code 30, so 30 × 5 = 150 mm bore. The 320 mm OD and 108 mm width come from the ISO 15 dimension-series plan (dimension series 23 (heavy OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 22330?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 22330 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 22330K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22330 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22330-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H2330 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22330",
      "22330 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21310",
    "brand": "SKF",
    "manufacturer_designation": "SKF 21310 E",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 27,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 159,
    "static_load_kN": 166,
    "fatigue_load_limit_kN": 18.6,
    "max_rpm": 7500,
    "reference_speed_rpm": 5600,
    "limiting_speed_rpm": 7500,
    "weight_g": 1350,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 21310 appears as 21310 E: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 50×110×27 mm to the ISO 15 boundary plan. Digit by digit, 21310 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 13, and bore reference 10 resolving to 50 mm; 110 mm OD and 27 mm width are the matching ISO 15 boundary values. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. The 30.0 mm radial section height ((110−50)/2) and 1350 g catalogue mass frame a 50 mm bore bearing rated at 159 kN C — roughly 3.18 kN of dynamic capacity per millimetre of bore before application factors. A 50 mm rotating inner ring usually runs k5 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.",
    "applications": [
      "industrial gearbox output shafts",
      "centrifugal pump and fan shafts",
      "hammer-mill and crusher rotors",
      "continuous-caster guide rolls"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "On this 50 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.",
      "The 21300-series series at 50 mm bore (110×27 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.",
      "Shaft and housing fillets must clear the bearing chamfer so the 27 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 21310; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 159/166 kN ratings are SKF catalogue values for this exact execution (21310 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 21310 (cylindrical bore as listed, tapered-bore 21310 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 21310 E designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21310?",
        "a": "The 21310 E is a double-row spherical roller bearing with 50 mm bore, 110 mm outer diameter and 27 mm width (1.969 × 4.331 × 1.063 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 159 kN, C0 166 kN, fatigue load limit Pu 18.6 kN, reference speed 5,600 r/min, limiting speed 7,500 r/min, mass about 1350 g. It is an open, self-aligning bearing with a stamped window-type steel cage."
      },
      {
        "q": "How does the 21310 bore code work?",
        "a": "The last two digits of 21310 are bore code 10, so 10 × 5 = 50 mm bore. The 110 mm OD and 27 mm width come from the ISO 15 dimension-series plan (dimension series 13 (heavy OD, normal width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the E suffix mean on 21310?",
        "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves."
      },
      {
        "q": "Can 21310 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 21310K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 21310 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6310",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6310-2RS",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6310-ZZ",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "21310-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H310 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21310",
      "21310 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21311",
    "brand": "SKF",
    "manufacturer_designation": "SKF 21311 E",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 29,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 159,
    "static_load_kN": 166,
    "fatigue_load_limit_kN": 18.6,
    "max_rpm": 7500,
    "reference_speed_rpm": 5600,
    "limiting_speed_rpm": 7500,
    "weight_g": 1700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "21311 E belongs to the SKF spherical roller range — the 55 mm bore entry in the 21300-series series (dimension series 13 (heavy OD, normal width)), dimensioned 120 mm OD and 29 mm wide. Numbering ties the bearing to its envelope: 21311 means spherical-roller type, dimension series 13, 55 mm bore — which is why the 120×29 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. Catalogue mass 1700 g for the 55×120×29 mm open execution covers the a stamped window-type steel cage; tapered-bore and sealed variants differ in mass and carry their own order numbers. After mounting, swing the outer ring to confirm free self-alignment: the 21311 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.",
    "applications": [
      "hammer-mill and crusher rotors",
      "continuous-caster guide rolls",
      "extruder gearbox shafts",
      "vibrating screen and scalper main shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still"
    ],
    "pitfalls": [
      "On this 55 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.",
      "The 21300-series series at 55 mm bore (120×29 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.",
      "The 1700 g mass and 29 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 21311.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 159/166 kN ratings are SKF catalogue values for this exact execution (21311 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 21311 (cylindrical bore as listed, tapered-bore 21311 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 21311 E designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21311?",
        "a": "The 21311 E is a double-row spherical roller bearing with 55 mm bore, 120 mm outer diameter and 29 mm width (2.165 × 4.724 × 1.142 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 159 kN, C0 166 kN, fatigue load limit Pu 18.6 kN, reference speed 5,600 r/min, limiting speed 7,500 r/min, mass about 1700 g. It is an open, self-aligning bearing with a stamped window-type steel cage."
      },
      {
        "q": "How does the 21311 bore code work?",
        "a": "The last two digits of 21311 are bore code 11, so 11 × 5 = 55 mm bore. The 120 mm OD and 29 mm width come from the ISO 15 dimension-series plan (dimension series 13 (heavy OD, normal width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the E suffix mean on 21311?",
        "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves."
      },
      {
        "q": "Can 21311 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 21311K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 21311 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21311-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "6311",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6311-2RS",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6311-ZZ",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "21311-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H311 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21311",
      "21311 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21312",
    "brand": "SKF",
    "manufacturer_designation": "SKF 21312 E",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 60,
    "D_mm": 130,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 217,
    "static_load_kN": 240,
    "fatigue_load_limit_kN": 26.5,
    "max_rpm": 6300,
    "reference_speed_rpm": 4800,
    "limiting_speed_rpm": 6300,
    "weight_g": 2100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 60 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 21312 under catalogue execution 21312 E: two barrel-roller rows on a sphered outer raceway. On the SKF nameplate, 21312 follows the ISO 15 convention: 2 for the spherical roller type, 13 for the dimension series 13 (heavy OD, normal width), final digits 12 for the 60 mm bore. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. At 4,800 r/min reference speed the 35.0 mm-section 21312 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 6,300 r/min as the mechanical ceiling. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 21312 EK variant instead and measure the drive-up or clearance reduction, not the nut torque.",
    "applications": [
      "heavy conveyor head shafts in mining",
      "jaw and cone crusher main shafts",
      "paper-machine press and dryer rolls",
      "rolling-mill pinion and back-up shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems"
    ],
    "pitfalls": [
      "Mount the 60 mm bore 21312 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 21300-series series at 60 mm bore (130×31 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 21312; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "Catalogue reference speed and limiting speed are different limits: the 4,800 r/min reference is a thermal criterion under load, while the 6,300 r/min limiting value is the mechanical ceiling — observe both.",
      "The 217/240 kN ratings are SKF catalogue values for this exact execution (21312 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 21312 (cylindrical bore as listed, tapered-bore 21312 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 21312 E designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21312?",
        "a": "The 21312 E is a double-row spherical roller bearing with 60 mm bore, 130 mm outer diameter and 31 mm width (2.362 × 5.118 × 1.22 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 217 kN, C0 240 kN, fatigue load limit Pu 26.5 kN, reference speed 4,800 r/min, limiting speed 6,300 r/min, mass about 2100 g. It is an open, self-aligning bearing with a stamped window-type steel cage."
      },
      {
        "q": "How does the 21312 bore code work?",
        "a": "The last two digits of 21312 are bore code 12, so 12 × 5 = 60 mm bore. The 130 mm OD and 31 mm width come from the ISO 15 dimension-series plan (dimension series 13 (heavy OD, normal width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the E suffix mean on 21312?",
        "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves."
      },
      {
        "q": "Can 21312 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 21312K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 21312 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21312-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "6312",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6312-2RS",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6312-ZZ",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "21312-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H312 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21312",
      "21312 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21313",
    "brand": "SKF",
    "manufacturer_designation": "SKF 21313 E",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 65,
    "D_mm": 140,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 243,
    "static_load_kN": 270,
    "fatigue_load_limit_kN": 29,
    "max_rpm": 6000,
    "reference_speed_rpm": 4300,
    "limiting_speed_rpm": 6000,
    "weight_g": 2550,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF 21313 (21313 E) is the spherical-roller choice for a 65 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 140×33 mm ISO 15 envelope. The code breaks down as type digit 2 (double-row spherical roller), dimension series 13 (dimension series 13 (heavy OD, normal width)), and bore code 13 = 65 mm; dimensions 65×140×33 mm therefore match the ISO 15 envelope. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. Speed planning uses two different ceilings: 4,300 r/min thermal reference and 6,000 r/min mechanical limiting speed. Mount with the spherical bearing's self-alignment in mind: it compensates ≈ 0.5–2.5° of misalignment depending on series, but the shaft and housing seats still set the datum — a rotating inner ring on a 65 mm shaft typically takes a k5 seat with an H7 housing bore.",
    "applications": [
      "paper-machine press and dryer rolls",
      "rolling-mill pinion and back-up shafts",
      "large vibrating screens and feeders",
      "marine propulsion and thruster shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Mount the 65 mm bore 21313 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 21300-series series at 65 mm bore (140×33 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 21313 pits long before its L10 life.",
      "The 243/270 kN ratings are SKF catalogue values for this exact execution (21313 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 21313 (cylindrical bore as listed, tapered-bore 21313 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 21313 E designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21313?",
        "a": "The 21313 E is a double-row spherical roller bearing with 65 mm bore, 140 mm outer diameter and 33 mm width (2.559 × 5.512 × 1.299 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 243 kN, C0 270 kN, fatigue load limit Pu 29 kN, reference speed 4,300 r/min, limiting speed 6,000 r/min, mass about 2550 g. It is an open, self-aligning bearing with a stamped window-type steel cage."
      },
      {
        "q": "How does the 21313 bore code work?",
        "a": "The last two digits of 21313 are bore code 13, so 13 × 5 = 65 mm bore. The 140 mm OD and 33 mm width come from the ISO 15 dimension-series plan (dimension series 13 (heavy OD, normal width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the E suffix mean on 21313?",
        "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves."
      },
      {
        "q": "Can 21313 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 21313K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 21313 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21313-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "6313",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6313-2RS",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6313-ZZ",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "21313-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H313 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21313",
      "21313 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21314",
    "brand": "SKF",
    "manufacturer_designation": "SKF 21314 E",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 70,
    "D_mm": 150,
    "B_mm": 35,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 291,
    "static_load_kN": 325,
    "fatigue_load_limit_kN": 34.5,
    "max_rpm": 5600,
    "reference_speed_rpm": 4000,
    "limiting_speed_rpm": 5600,
    "weight_g": 3100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number 21314 E in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 70 mm shaft, dimension series 13 (heavy OD, normal width), with open execution and a stamped window-type steel cage. Reading the designation: the leading 2 marks a spherical roller bearing, the 13 is the ISO 15 dimension series (dimension series 13 (heavy OD, normal width)), and the last two digits encode the 70 mm bore; the 150 mm OD and 35 mm width follow the ISO 15 general plan. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. With C 291 kN and C0 325 kN, the 21314 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 35 mm width across two roller rows needs the full charge.",
    "applications": [
      "large vibrating screens and feeders",
      "marine propulsion and thruster shafts",
      "cement-mill trunnion and drive shafts",
      "heavy conveyor head shafts in mining"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Mount the 70 mm bore 21314 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 21300-series series at 70 mm bore (150×35 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.",
      "Catalogue reference speed and limiting speed are different limits: the 4,000 r/min reference is a thermal criterion under load, while the 5,600 r/min limiting value is the mechanical ceiling — observe both.",
      "The 21314 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 291/325 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 291/325 kN ratings are SKF catalogue values for this exact execution (21314 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 21314 (cylindrical bore as listed, tapered-bore 21314 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 21314 E designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21314?",
        "a": "The 21314 E is a double-row spherical roller bearing with 70 mm bore, 150 mm outer diameter and 35 mm width (2.756 × 5.906 × 1.378 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 291 kN, C0 325 kN, fatigue load limit Pu 34.5 kN, reference speed 4,000 r/min, limiting speed 5,600 r/min, mass about 3100 g. It is an open, self-aligning bearing with a stamped window-type steel cage."
      },
      {
        "q": "How does the 21314 bore code work?",
        "a": "The last two digits of 21314 are bore code 14, so 14 × 5 = 70 mm bore. The 150 mm OD and 35 mm width come from the ISO 15 dimension-series plan (dimension series 13 (heavy OD, normal width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the E suffix mean on 21314?",
        "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves."
      },
      {
        "q": "Can 21314 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 21314K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 21314 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21314-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "6314",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6314-2RS",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6314-ZZ",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "21314-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H314 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21314",
      "21314 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21315",
    "brand": "SKF",
    "manufacturer_designation": "SKF 21315 E",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 75,
    "D_mm": 160,
    "B_mm": 37,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 291,
    "static_load_kN": 325,
    "fatigue_load_limit_kN": 34.5,
    "max_rpm": 5600,
    "reference_speed_rpm": 4000,
    "limiting_speed_rpm": 5600,
    "weight_g": 3750,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "21315 is a double-row spherical roller bearing in the 21300-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. Digit by digit, 21315 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 13, and bore reference 15 resolving to 75 mm; 160 mm OD and 37 mm width are the matching ISO 15 boundary values. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. The 34.5 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.12 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.",
    "applications": [
      "cement-mill trunnion and drive shafts",
      "heavy conveyor head shafts in mining",
      "jaw and cone crusher main shafts",
      "paper-machine press and dryer rolls"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still"
    ],
    "pitfalls": [
      "Mount the 75 mm bore 21315 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 21300-series series at 75 mm bore (160×37 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 21315 pits long before its L10 life.",
      "Shaft and housing fillets must clear the bearing chamfer so the 37 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 291/325 kN ratings are SKF catalogue values for this exact execution (21315 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 21315 (cylindrical bore as listed, tapered-bore 21315 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 21315 E designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21315?",
        "a": "The 21315 E is a double-row spherical roller bearing with 75 mm bore, 160 mm outer diameter and 37 mm width (2.953 × 6.299 × 1.457 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 291 kN, C0 325 kN, fatigue load limit Pu 34.5 kN, reference speed 4,000 r/min, limiting speed 5,600 r/min, mass about 3750 g. It is an open, self-aligning bearing with a stamped window-type steel cage."
      },
      {
        "q": "How does the 21315 bore code work?",
        "a": "The last two digits of 21315 are bore code 15, so 15 × 5 = 75 mm bore. The 160 mm OD and 37 mm width come from the ISO 15 dimension-series plan (dimension series 13 (heavy OD, normal width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the E suffix mean on 21315?",
        "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves."
      },
      {
        "q": "Can 21315 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 21315K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 21315 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21315-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "6315",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6315-2RS",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6315-ZZ",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "21315-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H315 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21315",
      "21315 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21316",
    "brand": "SKF",
    "manufacturer_designation": "SKF 21316 E",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 80,
    "D_mm": 170,
    "B_mm": 39,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 331,
    "static_load_kN": 375,
    "fatigue_load_limit_kN": 39,
    "max_rpm": 5300,
    "reference_speed_rpm": 3800,
    "limiting_speed_rpm": 5300,
    "weight_g": 4450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 21316 E is a 80×170×39 mm spherical roller bearing — the dimension series 13 (heavy OD, normal width) entry for a 80 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. Numbering ties the bearing to its envelope: 21316 means spherical-roller type, dimension series 13, 80 mm bore — which is why the 170×39 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. Selection arithmetic: the C0/C ratio is about 1.13 (static 375 kN against dynamic 331 kN), typical of a spherical roller sized for heavy combined loads, and the 39 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 80 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.",
    "applications": [
      "jaw and cone crusher main shafts",
      "paper-machine press and dryer rolls",
      "rolling-mill pinion and back-up shafts",
      "large vibrating screens and feeders"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems"
    ],
    "pitfalls": [
      "Mount the 80 mm bore 21316 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 21300-series series at 80 mm bore (170×39 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.",
      "The 21316 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 331/375 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 4450 g mass and 39 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 21316.",
      "The 331/375 kN ratings are SKF catalogue values for this exact execution (21316 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 21316 (cylindrical bore as listed, tapered-bore 21316 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 21316 E designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21316?",
        "a": "The 21316 E is a double-row spherical roller bearing with 80 mm bore, 170 mm outer diameter and 39 mm width (3.15 × 6.693 × 1.535 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 331 kN, C0 375 kN, fatigue load limit Pu 39 kN, reference speed 3,800 r/min, limiting speed 5,300 r/min, mass about 4450 g. It is an open, self-aligning bearing with a stamped window-type steel cage."
      },
      {
        "q": "How does the 21316 bore code work?",
        "a": "The last two digits of 21316 are bore code 16, so 16 × 5 = 80 mm bore. The 170 mm OD and 39 mm width come from the ISO 15 dimension-series plan (dimension series 13 (heavy OD, normal width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the E suffix mean on 21316?",
        "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves."
      },
      {
        "q": "Can 21316 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 21316K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 21316 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21316-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "6316",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6316-2RS",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6316-ZZ",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "21316-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H316 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21316",
      "21316 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21317",
    "brand": "SKF",
    "manufacturer_designation": "SKF 21317 E",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 85,
    "D_mm": 180,
    "B_mm": 41,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 331,
    "static_load_kN": 375,
    "fatigue_load_limit_kN": 39,
    "max_rpm": 5300,
    "reference_speed_rpm": 3800,
    "limiting_speed_rpm": 5300,
    "weight_g": 5200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 21317 appears as 21317 E: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 85×180×41 mm to the ISO 15 boundary plan. On the SKF nameplate, 21317 follows the ISO 15 convention: 2 for the spherical roller type, 13 for the dimension series 13 (heavy OD, normal width), final digits 17 for the 85 mm bore. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. The 47.5 mm radial section height ((180−85)/2) and 5200 g catalogue mass frame a 85 mm bore bearing rated at 331 kN C — roughly 3.89 kN of dynamic capacity per millimetre of bore before application factors. A 85 mm rotating inner ring usually runs k5 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.",
    "applications": [
      "rolling-mill pinion and back-up shafts",
      "large vibrating screens and feeders",
      "marine propulsion and thruster shafts",
      "cement-mill trunnion and drive shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Mount the 85 mm bore 21317 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 21300-series series at 85 mm bore (180×41 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.",
      "Shaft and housing fillets must clear the bearing chamfer so the 41 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 21317; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 331/375 kN ratings are SKF catalogue values for this exact execution (21317 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 21317 (cylindrical bore as listed, tapered-bore 21317 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 21317 E designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21317?",
        "a": "The 21317 E is a double-row spherical roller bearing with 85 mm bore, 180 mm outer diameter and 41 mm width (3.346 × 7.087 × 1.614 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 331 kN, C0 375 kN, fatigue load limit Pu 39 kN, reference speed 3,800 r/min, limiting speed 5,300 r/min, mass about 5200 g. It is an open, self-aligning bearing with a stamped window-type steel cage."
      },
      {
        "q": "How does the 21317 bore code work?",
        "a": "The last two digits of 21317 are bore code 17, so 17 × 5 = 85 mm bore. The 180 mm OD and 41 mm width come from the ISO 15 dimension-series plan (dimension series 13 (heavy OD, normal width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the E suffix mean on 21317?",
        "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves."
      },
      {
        "q": "Can 21317 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 21317K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 21317 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21317-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "6317",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6317-2RS",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6317-ZZ",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "21317-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H317 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21317",
      "21317 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21318",
    "brand": "SKF",
    "manufacturer_designation": "SKF 21318 E",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 90,
    "D_mm": 190,
    "B_mm": 43,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 393,
    "static_load_kN": 450,
    "fatigue_load_limit_kN": 45.5,
    "max_rpm": 4800,
    "reference_speed_rpm": 3600,
    "limiting_speed_rpm": 4800,
    "weight_g": 6100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "21318 E belongs to the SKF spherical roller range — the 90 mm bore entry in the 21300-series series (dimension series 13 (heavy OD, normal width)), dimensioned 190 mm OD and 43 mm wide. The code breaks down as type digit 2 (double-row spherical roller), dimension series 13 (dimension series 13 (heavy OD, normal width)), and bore code 18 = 90 mm; dimensions 90×190×43 mm therefore match the ISO 15 envelope. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. Catalogue mass 6100 g for the 90×190×43 mm open execution covers the a stamped window-type steel cage; tapered-bore and sealed variants differ in mass and carry their own order numbers. After mounting, swing the outer ring to confirm free self-alignment: the 21318 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.",
    "applications": [
      "marine propulsion and thruster shafts",
      "cement-mill trunnion and drive shafts",
      "heavy conveyor head shafts in mining",
      "jaw and cone crusher main shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Mount the 90 mm bore 21318 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 21300-series series at 90 mm bore (190×43 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.",
      "The 6100 g mass and 43 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 21318.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 393/450 kN ratings are SKF catalogue values for this exact execution (21318 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 21318 (cylindrical bore as listed, tapered-bore 21318 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 21318 E designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21318?",
        "a": "The 21318 E is a double-row spherical roller bearing with 90 mm bore, 190 mm outer diameter and 43 mm width (3.543 × 7.48 × 1.693 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 393 kN, C0 450 kN, fatigue load limit Pu 45.5 kN, reference speed 3,600 r/min, limiting speed 4,800 r/min, mass about 6100 g. It is an open, self-aligning bearing with a stamped window-type steel cage."
      },
      {
        "q": "How does the 21318 bore code work?",
        "a": "The last two digits of 21318 are bore code 18, so 18 × 5 = 90 mm bore. The 190 mm OD and 43 mm width come from the ISO 15 dimension-series plan (dimension series 13 (heavy OD, normal width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the E suffix mean on 21318?",
        "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves."
      },
      {
        "q": "Can 21318 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 21318K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 21318 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21318-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "6318",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6318-2RS",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6318-ZZ",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "21318-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H318 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21318",
      "21318 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21319",
    "brand": "SKF",
    "manufacturer_designation": "SKF 21319 E",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 95,
    "D_mm": 200,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 433,
    "static_load_kN": 490,
    "fatigue_load_limit_kN": 49,
    "max_rpm": 4500,
    "reference_speed_rpm": 3400,
    "limiting_speed_rpm": 4500,
    "weight_g": 7050,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 95 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 21319 under catalogue execution 21319 E: two barrel-roller rows on a sphered outer raceway. Reading the designation: the leading 2 marks a spherical roller bearing, the 13 is the ISO 15 dimension series (dimension series 13 (heavy OD, normal width)), and the last two digits encode the 95 mm bore; the 200 mm OD and 45 mm width follow the ISO 15 general plan. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. At 3,400 r/min reference speed the 52.5 mm-section 21319 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 4,500 r/min as the mechanical ceiling. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 21319 EK variant instead and measure the drive-up or clearance reduction, not the nut torque.",
    "applications": [
      "heavy conveyor head shafts in mining",
      "jaw and cone crusher main shafts",
      "paper-machine press and dryer rolls",
      "rolling-mill pinion and back-up shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still"
    ],
    "pitfalls": [
      "Mount the 95 mm bore 21319 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 21300-series series at 95 mm bore (200×45 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 21319; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "Catalogue reference speed and limiting speed are different limits: the 3,400 r/min reference is a thermal criterion under load, while the 4,500 r/min limiting value is the mechanical ceiling — observe both.",
      "The 433/490 kN ratings are SKF catalogue values for this exact execution (21319 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 21319 (cylindrical bore as listed, tapered-bore 21319 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 21319 E designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21319?",
        "a": "The 21319 E is a double-row spherical roller bearing with 95 mm bore, 200 mm outer diameter and 45 mm width (3.74 × 7.874 × 1.772 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 433 kN, C0 490 kN, fatigue load limit Pu 49 kN, reference speed 3,400 r/min, limiting speed 4,500 r/min, mass about 7050 g. It is an open, self-aligning bearing with a stamped window-type steel cage."
      },
      {
        "q": "How does the 21319 bore code work?",
        "a": "The last two digits of 21319 are bore code 19, so 19 × 5 = 95 mm bore. The 200 mm OD and 45 mm width come from the ISO 15 dimension-series plan (dimension series 13 (heavy OD, normal width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the E suffix mean on 21319?",
        "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves."
      },
      {
        "q": "Can 21319 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 21319K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 21319 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21319-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×200×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "6319",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6319-2RS",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6319-ZZ",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "21319-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H319 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21319",
      "21319 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21320",
    "brand": "SKF",
    "manufacturer_designation": "SKF 21320 E",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 100,
    "D_mm": 215,
    "B_mm": 47,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 433,
    "static_load_kN": 490,
    "fatigue_load_limit_kN": 49,
    "max_rpm": 4500,
    "reference_speed_rpm": 3400,
    "limiting_speed_rpm": 4500,
    "weight_g": 8600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF 21320 (21320 E) is the spherical-roller choice for a 100 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 215×47 mm ISO 15 envelope. On the SKF nameplate, 21320 follows the ISO 15 convention: 2 for the spherical roller type, 13 for the dimension series 13 (heavy OD, normal width), final digits 20 for the 100 mm bore. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. With C 433 kN and C0 490 kN, the 21320 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 100 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.",
    "applications": [
      "large vibrating screens and feeders",
      "marine propulsion and thruster shafts",
      "cement-mill trunnion and drive shafts",
      "heavy conveyor head shafts in mining"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still"
    ],
    "pitfalls": [
      "Mount the 100 mm bore 21320 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 21300-series series at 100 mm bore (215×47 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 21320; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 433/490 kN ratings are SKF catalogue values for this exact execution (21320 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 21320 (cylindrical bore as listed, tapered-bore 21320 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 21320 E designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21320?",
        "a": "The 21320 E is a double-row spherical roller bearing with 100 mm bore, 215 mm outer diameter and 47 mm width (3.937 × 8.465 × 1.85 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 433 kN, C0 490 kN, fatigue load limit Pu 49 kN, reference speed 3,400 r/min, limiting speed 4,500 r/min, mass about 8600 g. It is an open, self-aligning bearing with a stamped window-type steel cage."
      },
      {
        "q": "How does the 21320 bore code work?",
        "a": "The last two digits of 21320 are bore code 20, so 20 × 5 = 100 mm bore. The 215 mm OD and 47 mm width come from the ISO 15 dimension-series plan (dimension series 13 (heavy OD, normal width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the E suffix mean on 21320?",
        "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves."
      },
      {
        "q": "Can 21320 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 21320K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 21320 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21320-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "6320-2RS",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6320-ZZ",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "21320-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H320 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21320",
      "21320 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23022",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23022 CC/W33",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 170,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 326,
    "static_load_kN": 440,
    "fatigue_load_limit_kN": 46.5,
    "max_rpm": 4300,
    "reference_speed_rpm": 3400,
    "limiting_speed_rpm": 4300,
    "weight_g": 3800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 110 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 23022 under catalogue execution 23022 CC/W33: two barrel-roller rows on a sphered outer raceway. Digit by digit, 23022 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 30, and bore reference 22 resolving to 110 mm; 170 mm OD and 45 mm width are the matching ISO 15 boundary values. SKF basic executions here are E or CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Catalogue mass 3800 g for the 110×170×45 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. After mounting, swing the outer ring to confirm free self-alignment: the 23022 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.",
    "applications": [
      "marine propulsion and thruster shafts",
      "cement-mill trunnion and drive shafts",
      "heavy conveyor head shafts in mining",
      "jaw and cone crusher main shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Mount the 110 mm bore 23022 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 23000-series series at 110 mm bore (170×45 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The 23022 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 326/440 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "Shaft and housing fillets must clear the bearing chamfer so the 45 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 326/440 kN ratings are SKF catalogue values for this exact execution (23022 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23022 (cylindrical bore as listed, tapered-bore 23022 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23022 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23022?",
        "a": "The 23022 CC/W33 is a double-row spherical roller bearing with 110 mm bore, 170 mm outer diameter and 45 mm width (4.331 × 6.693 × 1.772 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 326 kN, C0 440 kN, fatigue load limit Pu 46.5 kN, reference speed 3,400 r/min, limiting speed 4,300 r/min, mass about 3800 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23022 bore code work?",
        "a": "The last two digits of 23022 are bore code 22, so 22 × 5 = 110 mm bore. The 170 mm OD and 45 mm width come from the ISO 15 dimension-series plan (dimension series 30 (slim OD, extra-wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23022?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23022 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23022K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23022 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23022-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H322 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23022",
      "23022 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23024",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23024 CC/W33",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 180,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 366,
    "static_load_kN": 500,
    "fatigue_load_limit_kN": 52,
    "max_rpm": 4000,
    "reference_speed_rpm": 3200,
    "limiting_speed_rpm": 4000,
    "weight_g": 4200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number 23024 CC/W33 in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 120 mm shaft, dimension series 30 (slim OD, extra-wide), with open execution and two pressed-steel cages with a floating guide ring. On the SKF nameplate, 23024 follows the ISO 15 convention: 2 for the spherical roller type, 30 for the dimension series 30 (slim OD, extra-wide), final digits 24 for the 120 mm bore. SKF basic executions here are E or CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Speed planning uses two different ceilings: 3,200 r/min thermal reference and 4,000 r/min mechanical limiting speed. Mount with the spherical bearing's self-alignment in mind: it compensates ≈ 0.5–2.5° of misalignment depending on series, but the shaft and housing seats still set the datum — a rotating inner ring on a 120 mm shaft typically takes a m6 seat with an H7 housing bore.",
    "applications": [
      "large mining crusher main shafts",
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still"
    ],
    "pitfalls": [
      "At 120 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23000-series series at 120 mm bore (180×46 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The 4200 g mass and 46 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23024.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23024; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 366/500 kN ratings are SKF catalogue values for this exact execution (23024 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23024 (cylindrical bore as listed, tapered-bore 23024 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23024 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23024?",
        "a": "The 23024 CC/W33 is a double-row spherical roller bearing with 120 mm bore, 180 mm outer diameter and 46 mm width (4.724 × 7.087 × 1.811 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 366 kN, C0 500 kN, fatigue load limit Pu 52 kN, reference speed 3,200 r/min, limiting speed 4,000 r/min, mass about 4200 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23024 bore code work?",
        "a": "The last two digits of 23024 are bore code 24, so 24 × 5 = 120 mm bore. The 180 mm OD and 46 mm width come from the ISO 15 dimension-series plan (dimension series 30 (slim OD, extra-wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23024?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23024 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23024K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23024 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23024-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on AHX3024 withdrawal sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C3024-V",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 3024 V shares the 120×180×46 mm envelope but catalogue C/C0 differ (430/640 kN vs 366/500 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23024",
      "23024 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23026",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23026 CC/W33",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 200,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 452,
    "static_load_kN": 610,
    "fatigue_load_limit_kN": 61,
    "max_rpm": 3600,
    "reference_speed_rpm": 2800,
    "limiting_speed_rpm": 3600,
    "weight_g": 6000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23026 CC/W33 is a 130×200×52 mm spherical roller bearing — the dimension series 30 (slim OD, extra-wide) entry for a 130 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. Reading the designation: the leading 2 marks a spherical roller bearing, the 30 is the ISO 15 dimension series (dimension series 30 (slim OD, extra-wide)), and the last two digits encode the 130 mm bore; the 200 mm OD and 52 mm width follow the ISO 15 general plan. SKF basic executions here are E or CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. The 61 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.35 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.",
    "applications": [
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 130 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23000-series series at 130 mm bore (200×52 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "Catalogue reference speed and limiting speed are different limits: the 2,800 r/min reference is a thermal criterion under load, while the 3,600 r/min limiting value is the mechanical ceiling — observe both.",
      "The 452/610 kN ratings are SKF catalogue values for this exact execution (23026 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23026 (cylindrical bore as listed, tapered-bore 23026 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23026 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23026?",
        "a": "The 23026 CC/W33 is a double-row spherical roller bearing with 130 mm bore, 200 mm outer diameter and 52 mm width (5.118 × 7.874 × 2.047 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 452 kN, C0 610 kN, fatigue load limit Pu 61 kN, reference speed 2,800 r/min, limiting speed 3,600 r/min, mass about 6000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23026 bore code work?",
        "a": "The last two digits of 23026 are bore code 26, so 26 × 5 = 130 mm bore. The 200 mm OD and 52 mm width come from the ISO 15 dimension-series plan (dimension series 30 (slim OD, extra-wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23026?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23026 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23026K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23026 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23026-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on AHX3026 withdrawal sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23026",
      "23026 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23028",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23028 CC/W33",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 210,
    "B_mm": 53,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 485,
    "static_load_kN": 680,
    "fatigue_load_limit_kN": 68,
    "max_rpm": 3400,
    "reference_speed_rpm": 2600,
    "limiting_speed_rpm": 3400,
    "weight_g": 6550,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23028 CC/W33 belongs to the SKF spherical roller range — the 140 mm bore entry in the 23000-series series (dimension series 30 (slim OD, extra-wide)), dimensioned 210 mm OD and 53 mm wide. Numbering ties the bearing to its envelope: 23028 means spherical-roller type, dimension series 30, 140 mm bore — which is why the 210×53 mm outline swaps dimensionally with other ISO 15 bearings of the same code. SKF basic executions here are E or CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. The 35.0 mm radial section height ((210−140)/2) and 6550 g catalogue mass frame a 140 mm bore bearing rated at 485 kN C — roughly 3.46 kN of dynamic capacity per millimetre of bore before application factors. A 140 mm rotating inner ring usually runs m6 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.",
    "applications": [
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still"
    ],
    "pitfalls": [
      "At 140 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23000-series series at 140 mm bore (210×53 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23028 pits long before its L10 life.",
      "The 23028 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 485/680 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 485/680 kN ratings are SKF catalogue values for this exact execution (23028 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23028 (cylindrical bore as listed, tapered-bore 23028 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23028 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23028?",
        "a": "The 23028 CC/W33 is a double-row spherical roller bearing with 140 mm bore, 210 mm outer diameter and 53 mm width (5.512 × 8.268 × 2.087 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 485 kN, C0 680 kN, fatigue load limit Pu 68 kN, reference speed 2,600 r/min, limiting speed 3,400 r/min, mass about 6550 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23028 bore code work?",
        "a": "The last two digits of 23028 are bore code 28, so 28 × 5 = 140 mm bore. The 210 mm OD and 53 mm width come from the ISO 15 dimension-series plan (dimension series 30 (slim OD, extra-wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23028?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23028 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23028K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23028 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23028-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on AHX3028 withdrawal sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23028",
      "23028 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23030",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23030 CC/W33",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 225,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 531,
    "static_load_kN": 750,
    "fatigue_load_limit_kN": 73.5,
    "max_rpm": 3200,
    "reference_speed_rpm": 2400,
    "limiting_speed_rpm": 3200,
    "weight_g": 7950,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF 23030 (23030 CC/W33) is the spherical-roller choice for a 150 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 225×56 mm ISO 15 envelope. Digit by digit, 23030 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 30, and bore reference 30 resolving to 150 mm; 225 mm OD and 56 mm width are the matching ISO 15 boundary values. SKF basic executions here are E or CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Speed planning uses two different ceilings: 2,400 r/min thermal reference and 3,200 r/min mechanical limiting speed. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.",
    "applications": [
      "large mining crusher main shafts",
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems"
    ],
    "pitfalls": [
      "At 150 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23000-series series at 150 mm bore (225×56 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The 23030 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 531/750 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 23030 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 531/750 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 531/750 kN ratings are SKF catalogue values for this exact execution (23030 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23030 (cylindrical bore as listed, tapered-bore 23030 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23030 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23030?",
        "a": "The 23030 CC/W33 is a double-row spherical roller bearing with 150 mm bore, 225 mm outer diameter and 56 mm width (5.906 × 8.858 × 2.205 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 531 kN, C0 750 kN, fatigue load limit Pu 73.5 kN, reference speed 2,400 r/min, limiting speed 3,200 r/min, mass about 7950 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23030 bore code work?",
        "a": "The last two digits of 23030 are bore code 30, so 30 × 5 = 150 mm bore. The 225 mm OD and 56 mm width come from the ISO 15 dimension-series plan (dimension series 30 (slim OD, extra-wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23030?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23030 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23030K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23030 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23030-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H3030 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C3030-MB",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 3030 MB shares the 150×225×56 mm envelope but catalogue C/C0 differ (540/850 kN vs 531/750 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C3030-V",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 3030 V shares the 150×225×56 mm envelope but catalogue C/C0 differ (585/960 kN vs 531/750 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C3030-KV",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 3030 KV shares the 150×225×56 mm envelope but catalogue C/C0 differ (585/960 kN vs 531/750 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23030",
      "23030 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23032",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23032 CC/W33",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 240,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 614,
    "static_load_kN": 880,
    "fatigue_load_limit_kN": 83,
    "max_rpm": 3000,
    "reference_speed_rpm": 2400,
    "limiting_speed_rpm": 3000,
    "weight_g": 9700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23032 is a double-row spherical roller bearing in the 23000-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. On the SKF nameplate, 23032 follows the ISO 15 convention: 2 for the spherical roller type, 30 for the dimension series 30 (slim OD, extra-wide), final digits 32 for the 160 mm bore. SKF basic executions here are E or CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. The 83 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.43 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. A 160 mm rotating inner ring usually runs m6 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.",
    "applications": [
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At 160 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23000-series series at 160 mm bore (240×60 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The 9700 g mass and 60 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23032.",
      "The 9700 g mass and 60 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23032.",
      "The 614/880 kN ratings are SKF catalogue values for this exact execution (23032 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23032 (cylindrical bore as listed, tapered-bore 23032 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23032 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23032?",
        "a": "The 23032 CC/W33 is a double-row spherical roller bearing with 160 mm bore, 240 mm outer diameter and 60 mm width (6.299 × 9.449 × 2.362 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 614 kN, C0 880 kN, fatigue load limit Pu 83 kN, reference speed 2,400 r/min, limiting speed 3,000 r/min, mass about 9700 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23032 bore code work?",
        "a": "The last two digits of 23032 are bore code 32, so 32 × 5 = 160 mm bore. The 240 mm OD and 60 mm width come from the ISO 15 dimension-series plan (dimension series 30 (slim OD, extra-wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23032?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23032 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23032K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23032 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23032-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H3032 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23032",
      "23032 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23034",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23034 CC/W33",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 260,
    "B_mm": 67,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 745,
    "static_load_kN": 1060,
    "fatigue_load_limit_kN": 100,
    "max_rpm": 2800,
    "reference_speed_rpm": 2200,
    "limiting_speed_rpm": 2800,
    "weight_g": 13000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 23034 appears as 23034 CC/W33: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 170×260×67 mm to the ISO 15 boundary plan. Reading the designation: the leading 2 marks a spherical roller bearing, the 30 is the ISO 15 dimension series (dimension series 30 (slim OD, extra-wide)), and the last two digits encode the 170 mm bore; the 260 mm OD and 67 mm width follow the ISO 15 general plan. SKF basic executions here are E or CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. The 45.0 mm radial section height ((260−170)/2) and 13000 g catalogue mass frame a 170 mm bore bearing rated at 745 kN C — roughly 4.38 kN of dynamic capacity per millimetre of bore before application factors. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 23034 CCK/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.",
    "applications": [
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems"
    ],
    "pitfalls": [
      "At 170 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23000-series series at 170 mm bore (260×67 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 745/1060 kN ratings are SKF catalogue values for this exact execution (23034 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23034 (cylindrical bore as listed, tapered-bore 23034 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23034 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23034?",
        "a": "The 23034 CC/W33 is a double-row spherical roller bearing with 170 mm bore, 260 mm outer diameter and 67 mm width (6.693 × 10.236 × 2.638 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 745 kN, C0 1060 kN, fatigue load limit Pu 100 kN, reference speed 2,200 r/min, limiting speed 2,800 r/min, mass about 13000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23034 bore code work?",
        "a": "The last two digits of 23034 are bore code 34, so 34 × 5 = 170 mm bore. The 260 mm OD and 67 mm width come from the ISO 15 dimension-series plan (dimension series 30 (slim OD, extra-wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23034?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23034 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23034K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23034 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23034-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H3034 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C3034-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3034 M shares the 170×260×67 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23034",
      "23034 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23036",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23036 CC/W33",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 280,
    "B_mm": 74,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 883,
    "static_load_kN": 1250,
    "fatigue_load_limit_kN": 114,
    "max_rpm": 2600,
    "reference_speed_rpm": 2000,
    "limiting_speed_rpm": 2600,
    "weight_g": 17000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 180 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 23036 under catalogue execution 23036 CC/W33: two barrel-roller rows on a sphered outer raceway. Numbering ties the bearing to its envelope: 23036 means spherical-roller type, dimension series 30, 180 mm bore — which is why the 280×74 mm outline swaps dimensionally with other ISO 15 bearings of the same code. SKF basic executions here are E or CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. At 2,000 r/min reference speed the 50.0 mm-section 23036 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 2,600 r/min as the mechanical ceiling. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 74 mm width across two roller rows needs the full charge.",
    "applications": [
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "wind-turbine main shaft support"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At 180 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23000-series series at 180 mm bore (280×74 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23036 pits long before its L10 life.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23036 pits long before its L10 life.",
      "The 883/1250 kN ratings are SKF catalogue values for this exact execution (23036 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23036 (cylindrical bore as listed, tapered-bore 23036 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23036 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23036?",
        "a": "The 23036 CC/W33 is a double-row spherical roller bearing with 180 mm bore, 280 mm outer diameter and 74 mm width (7.087 × 11.024 × 2.913 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 883 kN, C0 1250 kN, fatigue load limit Pu 114 kN, reference speed 2,000 r/min, limiting speed 2,600 r/min, mass about 17000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23036 bore code work?",
        "a": "The last two digits of 23036 are bore code 36, so 36 × 5 = 180 mm bore. The 280 mm OD and 74 mm width come from the ISO 15 dimension-series plan (dimension series 30 (slim OD, extra-wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23036?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23036 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23036K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23036 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23036-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H3036 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C3036",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3036 shares the 180×280×74 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C3036-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3036 K shares the 180×280×74 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23036",
      "23036 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23038",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23038 CC/W33",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 190,
    "D_mm": 290,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 916,
    "static_load_kN": 1340,
    "fatigue_load_limit_kN": 122,
    "max_rpm": 2400,
    "reference_speed_rpm": 1900,
    "limiting_speed_rpm": 2400,
    "weight_g": 18000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number 23038 CC/W33 in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 190 mm shaft, dimension series 30 (slim OD, extra-wide), with open execution and two pressed-steel cages with a floating guide ring. The code breaks down as type digit 2 (double-row spherical roller), dimension series 30 (dimension series 30 (slim OD, extra-wide)), and bore code 38 = 190 mm; dimensions 190×290×75 mm therefore match the ISO 15 envelope. SKF basic executions here are E or CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. With C 916 kN and C0 1340 kN, the 23038 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 190 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.",
    "applications": [
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems"
    ],
    "pitfalls": [
      "At 190 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23000-series series at 190 mm bore (290×75 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "Shaft and housing fillets must clear the bearing chamfer so the 75 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "Shaft and housing fillets must clear the bearing chamfer so the 75 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 916/1340 kN ratings are SKF catalogue values for this exact execution (23038 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23038 (cylindrical bore as listed, tapered-bore 23038 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23038 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23038?",
        "a": "The 23038 CC/W33 is a double-row spherical roller bearing with 190 mm bore, 290 mm outer diameter and 75 mm width (7.48 × 11.417 × 2.953 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 916 kN, C0 1340 kN, fatigue load limit Pu 122 kN, reference speed 1,900 r/min, limiting speed 2,400 r/min, mass about 18000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23038 bore code work?",
        "a": "The last two digits of 23038 are bore code 38, so 38 × 5 = 190 mm bore. The 290 mm OD and 75 mm width come from the ISO 15 dimension-series plan (dimension series 30 (slim OD, extra-wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23038?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23038 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23038K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23038 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23038-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H3038 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C3038",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3038 shares the 190×290×75 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C3038-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3038 K shares the 190×290×75 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23038",
      "23038 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23040",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23040 CC/W33",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 200,
    "D_mm": 310,
    "B_mm": 82,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1058,
    "static_load_kN": 1530,
    "fatigue_load_limit_kN": 137,
    "max_rpm": 2200,
    "reference_speed_rpm": 1800,
    "limiting_speed_rpm": 2200,
    "weight_g": 23500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23040 CC/W33 is a 200×310×82 mm spherical roller bearing — the dimension series 30 (slim OD, extra-wide) entry for a 200 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. On the SKF nameplate, 23040 follows the ISO 15 convention: 2 for the spherical roller type, 30 for the dimension series 30 (slim OD, extra-wide), final digits 40 for the 200 mm bore. SKF basic executions here are E or CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. The 55.0 mm radial section height ((310−200)/2) and 23500 g catalogue mass frame a 200 mm bore bearing rated at 1058 kN C — roughly 5.29 kN of dynamic capacity per millimetre of bore before application factors. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 82 mm width across two roller rows needs the full charge.",
    "applications": [
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 200 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23000-series series at 200 mm bore (310×82 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The 23500 g mass and 82 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23040.",
      "Shaft and housing fillets must clear the bearing chamfer so the 82 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 1058/1530 kN ratings are SKF catalogue values for this exact execution (23040 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23040 (cylindrical bore as listed, tapered-bore 23040 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23040 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23040?",
        "a": "The 23040 CC/W33 is a double-row spherical roller bearing with 200 mm bore, 310 mm outer diameter and 82 mm width (7.874 × 12.205 × 3.228 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1058 kN, C0 1530 kN, fatigue load limit Pu 137 kN, reference speed 1,800 r/min, limiting speed 2,200 r/min, mass about 23500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23040 bore code work?",
        "a": "The last two digits of 23040 are bore code 40, so 40 × 5 = 200 mm bore. The 310 mm OD and 82 mm width come from the ISO 15 dimension-series plan (dimension series 30 (slim OD, extra-wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23040?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23040 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23040K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23040 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23040-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on AH3040 withdrawal sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C3040",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 3040 shares the 200×310×82 mm envelope but catalogue C/C0 differ (1120/1730 kN vs 1058/1530 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C3040-K",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 3040 K shares the 200×310×82 mm envelope but catalogue C/C0 differ (1120/1730 kN vs 1058/1530 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23040",
      "23040 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23044",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23044 CC/W33",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 220,
    "D_mm": 340,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1261,
    "static_load_kN": 1860,
    "fatigue_load_limit_kN": 163,
    "max_rpm": 2000,
    "reference_speed_rpm": 1600,
    "limiting_speed_rpm": 2000,
    "weight_g": 30500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF 23044 (23044 CC/W33) is the spherical-roller choice for a 220 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 340×90 mm ISO 15 envelope. Numbering ties the bearing to its envelope: 23044 means spherical-roller type, dimension series 30, 220 mm bore — which is why the 340×90 mm outline swaps dimensionally with other ISO 15 bearings of the same code. SKF basic executions here are E or CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. With C 1261 kN and C0 1860 kN, the 23044 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. After mounting, swing the outer ring to confirm free self-alignment: the 23044 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.",
    "applications": [
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 220 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23000-series series at 220 mm bore (340×90 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23044 pits long before its L10 life.",
      "Catalogue reference speed and limiting speed are different limits: the 1,600 r/min reference is a thermal criterion under load, while the 2,000 r/min limiting value is the mechanical ceiling — observe both.",
      "The 1261/1860 kN ratings are SKF catalogue values for this exact execution (23044 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23044 (cylindrical bore as listed, tapered-bore 23044 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23044 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23044?",
        "a": "The 23044 CC/W33 is a double-row spherical roller bearing with 220 mm bore, 340 mm outer diameter and 90 mm width (8.661 × 13.386 × 3.543 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1261 kN, C0 1860 kN, fatigue load limit Pu 163 kN, reference speed 1,600 r/min, limiting speed 2,000 r/min, mass about 30500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23044 bore code work?",
        "a": "The last two digits of 23044 are bore code 44, so 44 × 5 = 220 mm bore. The 340 mm OD and 90 mm width come from the ISO 15 dimension-series plan (dimension series 30 (slim OD, extra-wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23044?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23044 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23044K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23044 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23044-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on AOH3044 withdrawal sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C3044",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3044 shares the 220×340×90 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C3044-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3044 K shares the 220×340×90 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23044",
      "23044 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23048",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23048 CC/W33",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 240,
    "D_mm": 360,
    "B_mm": 92,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1340,
    "static_load_kN": 2080,
    "fatigue_load_limit_kN": 176,
    "max_rpm": 1900,
    "reference_speed_rpm": 1500,
    "limiting_speed_rpm": 1900,
    "weight_g": 33500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 23048 appears as 23048 CC/W33: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 240×360×92 mm to the ISO 15 boundary plan. Digit by digit, 23048 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 30, and bore reference 48 resolving to 240 mm; 360 mm OD and 92 mm width are the matching ISO 15 boundary values. SKF basic executions here are E or CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Catalogue mass 33500 g for the 240×360×92 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.",
    "applications": [
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 240 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23000-series series at 240 mm bore (360×92 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23048; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 33500 g mass and 92 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23048.",
      "The 1340/2080 kN ratings are SKF catalogue values for this exact execution (23048 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23048 (cylindrical bore as listed, tapered-bore 23048 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23048 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23048?",
        "a": "The 23048 CC/W33 is a double-row spherical roller bearing with 240 mm bore, 360 mm outer diameter and 92 mm width (9.449 × 14.173 × 3.622 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1340 kN, C0 2080 kN, fatigue load limit Pu 176 kN, reference speed 1,500 r/min, limiting speed 1,900 r/min, mass about 33500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23048 bore code work?",
        "a": "The last two digits of 23048 are bore code 48, so 48 × 5 = 240 mm bore. The 360 mm OD and 92 mm width come from the ISO 15 dimension-series plan (dimension series 30 (slim OD, extra-wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23048?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23048 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23048K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23048 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23048-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on AOH3048 withdrawal sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C3048",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3048 shares the 240×360×92 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C3048-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3048 K shares the 240×360×92 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23048",
      "23048 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23052",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23052 CC/W33",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 260,
    "D_mm": 400,
    "B_mm": 104,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1675,
    "static_load_kN": 2550,
    "fatigue_load_limit_kN": 212,
    "max_rpm": 1700,
    "reference_speed_rpm": 1300,
    "limiting_speed_rpm": 1700,
    "weight_g": 48500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number 23052 CC/W33 in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 260 mm shaft, dimension series 30 (slim OD, extra-wide), with open execution and two pressed-steel cages with a floating guide ring. Numbering ties the bearing to its envelope: 23052 means spherical-roller type, dimension series 30, 260 mm bore — which is why the 400×104 mm outline swaps dimensionally with other ISO 15 bearings of the same code. SKF basic executions here are E or CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Selection arithmetic: the C0/C ratio is about 1.52 (static 2550 kN against dynamic 1675 kN), typical of a spherical roller sized for heavy combined loads, and the 212 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.",
    "applications": [
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems"
    ],
    "pitfalls": [
      "At 260 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23000-series series at 260 mm bore (400×104 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23052 pits long before its L10 life.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 1675/2550 kN ratings are SKF catalogue values for this exact execution (23052 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23052 (cylindrical bore as listed, tapered-bore 23052 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23052 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23052?",
        "a": "The 23052 CC/W33 is a double-row spherical roller bearing with 260 mm bore, 400 mm outer diameter and 104 mm width (10.236 × 15.748 × 4.094 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1675 kN, C0 2550 kN, fatigue load limit Pu 212 kN, reference speed 1,300 r/min, limiting speed 1,700 r/min, mass about 48500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23052 bore code work?",
        "a": "The last two digits of 23052 are bore code 52, so 52 × 5 = 260 mm bore. The 400 mm OD and 104 mm width come from the ISO 15 dimension-series plan (dimension series 30 (slim OD, extra-wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23052?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23052 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23052K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23052 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23052-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on OH3052 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C3052",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 3052 shares the 260×400×104 mm envelope but catalogue C/C0 differ (1760/2850 kN vs 1675/2550 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C3052-K",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 3052 K shares the 260×400×104 mm envelope but catalogue C/C0 differ (1760/2850 kN vs 1675/2550 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23052",
      "23052 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23056",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23056 CC/W33",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 280,
    "D_mm": 420,
    "B_mm": 106,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1797,
    "static_load_kN": 2850,
    "fatigue_load_limit_kN": 224,
    "max_rpm": 1600,
    "reference_speed_rpm": 1300,
    "limiting_speed_rpm": 1600,
    "weight_g": 52500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23056 CC/W33 belongs to the SKF spherical roller range — the 280 mm bore entry in the 23000-series series (dimension series 30 (slim OD, extra-wide)), dimensioned 420 mm OD and 106 mm wide. Digit by digit, 23056 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 30, and bore reference 56 resolving to 280 mm; 420 mm OD and 106 mm width are the matching ISO 15 boundary values. SKF basic executions here are E or CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Speed planning uses two different ceilings: 1,300 r/min thermal reference and 1,600 r/min mechanical limiting speed. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 23056 CCK/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.",
    "applications": [
      "large mining crusher main shafts",
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems"
    ],
    "pitfalls": [
      "At 280 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23000-series series at 280 mm bore (420×106 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23056; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "Shaft and housing fillets must clear the bearing chamfer so the 106 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 1797/2850 kN ratings are SKF catalogue values for this exact execution (23056 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23056 (cylindrical bore as listed, tapered-bore 23056 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23056 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23056?",
        "a": "The 23056 CC/W33 is a double-row spherical roller bearing with 280 mm bore, 420 mm outer diameter and 106 mm width (11.024 × 16.535 × 4.173 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1797 kN, C0 2850 kN, fatigue load limit Pu 224 kN, reference speed 1,300 r/min, limiting speed 1,600 r/min, mass about 52500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23056 bore code work?",
        "a": "The last two digits of 23056 are bore code 56, so 56 × 5 = 280 mm bore. The 420 mm OD and 106 mm width come from the ISO 15 dimension-series plan (dimension series 30 (slim OD, extra-wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23056?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23056 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23056K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23056 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23056-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on OH3056 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C3056",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3056 shares the 280×420×106 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C3056-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3056 K shares the 280×420×106 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23056",
      "23056 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23060",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23060 CC/W33",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 300,
    "D_mm": 460,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 2219,
    "static_load_kN": 3450,
    "fatigue_load_limit_kN": 265,
    "max_rpm": 1500,
    "reference_speed_rpm": 1200,
    "limiting_speed_rpm": 1500,
    "weight_g": 71500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23060 is a double-row spherical roller bearing in the 23000-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. Numbering ties the bearing to its envelope: 23060 means spherical-roller type, dimension series 30, 300 mm bore — which is why the 460×118 mm outline swaps dimensionally with other ISO 15 bearings of the same code. SKF basic executions here are E or CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Catalogue mass 71500 g for the 300×460×118 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 23060 CCK/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.",
    "applications": [
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still"
    ],
    "pitfalls": [
      "At 300 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23000-series series at 300 mm bore (460×118 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23060 pits long before its L10 life.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23060; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 2219/3450 kN ratings are SKF catalogue values for this exact execution (23060 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23060 (cylindrical bore as listed, tapered-bore 23060 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23060 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23060?",
        "a": "The 23060 CC/W33 is a double-row spherical roller bearing with 300 mm bore, 460 mm outer diameter and 118 mm width (11.811 × 18.11 × 4.646 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2219 kN, C0 3450 kN, fatigue load limit Pu 265 kN, reference speed 1,200 r/min, limiting speed 1,500 r/min, mass about 71500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23060 bore code work?",
        "a": "The last two digits of 23060 are bore code 60, so 60 × 5 = 300 mm bore. The 460 mm OD and 118 mm width come from the ISO 15 dimension-series plan (dimension series 30 (slim OD, extra-wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23060?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23060 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23060K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23060 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23060-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on OH3060 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C3060-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3060 M shares the 300×460×118 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C3060-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3060 KM shares the 300×460×118 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23060",
      "23060 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23064",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23064 CC/W33",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 320,
    "D_mm": 480,
    "B_mm": 121,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 2348,
    "static_load_kN": 3800,
    "fatigue_load_limit_kN": 285,
    "max_rpm": 1400,
    "reference_speed_rpm": 1100,
    "limiting_speed_rpm": 1400,
    "weight_g": 78000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 320 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 23064 under catalogue execution 23064 CC/W33: two barrel-roller rows on a sphered outer raceway. Digit by digit, 23064 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 30, and bore reference 64 resolving to 320 mm; 480 mm OD and 121 mm width are the matching ISO 15 boundary values. SKF basic executions here are E or CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. The 285 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.62 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 320 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.",
    "applications": [
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still"
    ],
    "pitfalls": [
      "At 320 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23000-series series at 320 mm bore (480×121 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23064; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 23064 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 2348/3800 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 2348/3800 kN ratings are SKF catalogue values for this exact execution (23064 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23064 (cylindrical bore as listed, tapered-bore 23064 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23064 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23064?",
        "a": "The 23064 CC/W33 is a double-row spherical roller bearing with 320 mm bore, 480 mm outer diameter and 121 mm width (12.598 × 18.898 × 4.764 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2348 kN, C0 3800 kN, fatigue load limit Pu 285 kN, reference speed 1,100 r/min, limiting speed 1,400 r/min, mass about 78000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23064 bore code work?",
        "a": "The last two digits of 23064 are bore code 64, so 64 × 5 = 320 mm bore. The 480 mm OD and 121 mm width come from the ISO 15 dimension-series plan (dimension series 30 (slim OD, extra-wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23064?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23064 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23064K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23064 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23064-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on OH3064 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C3064-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3064 M shares the 320×480×121 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C3064-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3064 KM shares the 320×480×121 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23064",
      "23064 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23120",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23120 CC/W33",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 100,
    "D_mm": 165,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 385,
    "static_load_kN": 490,
    "fatigue_load_limit_kN": 53,
    "max_rpm": 4000,
    "reference_speed_rpm": 3000,
    "limiting_speed_rpm": 4000,
    "weight_g": 4550,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 100 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 23120 under catalogue execution 23120 CC/W33: two barrel-roller rows on a sphered outer raceway. On the SKF nameplate, 23120 follows the ISO 15 convention: 2 for the spherical roller type, 31 for the dimension series 31 (medium OD, wide), final digits 20 for the 100 mm bore. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. The 53 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.27 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. Mount with the spherical bearing's self-alignment in mind: it compensates ≈ 0.5–2.5° of misalignment depending on series, but the shaft and housing seats still set the datum — a rotating inner ring on a 100 mm shaft typically takes a k5 seat with an H7 housing bore.",
    "applications": [
      "cement-mill trunnion and drive shafts",
      "heavy conveyor head shafts in mining",
      "jaw and cone crusher main shafts",
      "paper-machine press and dryer rolls"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Mount the 100 mm bore 23120 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 23100-series series at 100 mm bore (165×52 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.",
      "The 4550 g mass and 52 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23120.",
      "The 4550 g mass and 52 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23120.",
      "The 385/490 kN ratings are SKF catalogue values for this exact execution (23120 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23120 (cylindrical bore as listed, tapered-bore 23120 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23120 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23120?",
        "a": "The 23120 CC/W33 is a double-row spherical roller bearing with 100 mm bore, 165 mm outer diameter and 52 mm width (3.937 × 6.496 × 2.047 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 385 kN, C0 490 kN, fatigue load limit Pu 53 kN, reference speed 3,000 r/min, limiting speed 4,000 r/min, mass about 4550 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23120 bore code work?",
        "a": "The last two digits of 23120 are bore code 20, so 20 × 5 = 100 mm bore. The 165 mm OD and 52 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23120?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23120 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23120K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23120 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23120",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23120-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H3120 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C3120-V",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 3120 V shares the 100×165×52 mm envelope but catalogue C/C0 differ (475/655 kN vs 385/490 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23120",
      "23120 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23122",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23122 CC/W33",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 180,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 450,
    "static_load_kN": 585,
    "fatigue_load_limit_kN": 61,
    "max_rpm": 3600,
    "reference_speed_rpm": 2800,
    "limiting_speed_rpm": 3600,
    "weight_g": 5750,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number 23122 CC/W33 in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 110 mm shaft, dimension series 31 (medium OD, wide), with open execution and two pressed-steel cages with a floating guide ring. Reading the designation: the leading 2 marks a spherical roller bearing, the 31 is the ISO 15 dimension series (dimension series 31 (medium OD, wide)), and the last two digits encode the 110 mm bore; the 180 mm OD and 56 mm width follow the ISO 15 general plan. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. The 35.0 mm radial section height ((180−110)/2) and 5750 g catalogue mass frame a 110 mm bore bearing rated at 450 kN C — roughly 4.09 kN of dynamic capacity per millimetre of bore before application factors. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.",
    "applications": [
      "rolling-mill pinion and back-up shafts",
      "large vibrating screens and feeders",
      "marine propulsion and thruster shafts",
      "cement-mill trunnion and drive shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals"
    ],
    "pitfalls": [
      "Mount the 110 mm bore 23122 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 23100-series series at 110 mm bore (180×56 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 450/585 kN ratings are SKF catalogue values for this exact execution (23122 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23122 (cylindrical bore as listed, tapered-bore 23122 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23122 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23122?",
        "a": "The 23122 CC/W33 is a double-row spherical roller bearing with 110 mm bore, 180 mm outer diameter and 56 mm width (4.331 × 7.087 × 2.205 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 450 kN, C0 585 kN, fatigue load limit Pu 61 kN, reference speed 2,800 r/min, limiting speed 3,600 r/min, mass about 5750 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23122 bore code work?",
        "a": "The last two digits of 23122 are bore code 22, so 22 × 5 = 110 mm bore. The 180 mm OD and 56 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23122?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23122 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23122K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23122 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23122",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23122-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H3122 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23122",
      "23122 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23124",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23124 CC/W33",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 200,
    "B_mm": 62,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 534,
    "static_load_kN": 695,
    "fatigue_load_limit_kN": 71,
    "max_rpm": 3400,
    "reference_speed_rpm": 2600,
    "limiting_speed_rpm": 3400,
    "weight_g": 8000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23124 CC/W33 is a 120×200×62 mm spherical roller bearing — the dimension series 31 (medium OD, wide) entry for a 120 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. Numbering ties the bearing to its envelope: 23124 means spherical-roller type, dimension series 31, 120 mm bore — which is why the 200×62 mm outline swaps dimensionally with other ISO 15 bearings of the same code. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. At 2,600 r/min reference speed the 40.0 mm-section 23124 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 3,400 r/min as the mechanical ceiling. A 120 mm rotating inner ring usually runs m6 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.",
    "applications": [
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "wind-turbine main shaft support"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "At 120 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23100-series series at 120 mm bore (200×62 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23124 pits long before its L10 life.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23124 pits long before its L10 life.",
      "The 534/695 kN ratings are SKF catalogue values for this exact execution (23124 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23124 (cylindrical bore as listed, tapered-bore 23124 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23124 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23124?",
        "a": "The 23124 CC/W33 is a double-row spherical roller bearing with 120 mm bore, 200 mm outer diameter and 62 mm width (4.724 × 7.874 × 2.441 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 534 kN, C0 695 kN, fatigue load limit Pu 71 kN, reference speed 2,600 r/min, limiting speed 3,400 r/min, mass about 8000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23124 bore code work?",
        "a": "The last two digits of 23124 are bore code 24, so 24 × 5 = 120 mm bore. The 200 mm OD and 62 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23124?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23124 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23124K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23124 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23124",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23124-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on AHX3124 withdrawal sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23124",
      "23124 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23126",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23126 CC/W33",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 210,
    "B_mm": 64,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 586,
    "static_load_kN": 780,
    "fatigue_load_limit_kN": 78,
    "max_rpm": 3200,
    "reference_speed_rpm": 2400,
    "limiting_speed_rpm": 3200,
    "weight_g": 8800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23126 CC/W33 belongs to the SKF spherical roller range — the 130 mm bore entry in the 23100-series series (dimension series 31 (medium OD, wide)), dimensioned 210 mm OD and 64 mm wide. The code breaks down as type digit 2 (double-row spherical roller), dimension series 31 (dimension series 31 (medium OD, wide)), and bore code 26 = 130 mm; dimensions 130×210×64 mm therefore match the ISO 15 envelope. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. With C 586 kN and C0 780 kN, the 23126 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 23126 CCK/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.",
    "applications": [
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals"
    ],
    "pitfalls": [
      "At 130 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23100-series series at 130 mm bore (210×64 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.",
      "Shaft and housing fillets must clear the bearing chamfer so the 64 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "Shaft and housing fillets must clear the bearing chamfer so the 64 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 586/780 kN ratings are SKF catalogue values for this exact execution (23126 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23126 (cylindrical bore as listed, tapered-bore 23126 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23126 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23126?",
        "a": "The 23126 CC/W33 is a double-row spherical roller bearing with 130 mm bore, 210 mm outer diameter and 64 mm width (5.118 × 8.268 × 2.52 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 586 kN, C0 780 kN, fatigue load limit Pu 78 kN, reference speed 2,400 r/min, limiting speed 3,200 r/min, mass about 8800 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23126 bore code work?",
        "a": "The last two digits of 23126 are bore code 26, so 26 × 5 = 130 mm bore. The 210 mm OD and 64 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23126?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23126 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23126K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23126 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23126",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23126-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on AHX3126 withdrawal sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23126",
      "23126 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23128",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23128 CC/W33",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 225,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 659,
    "static_load_kN": 900,
    "fatigue_load_limit_kN": 88,
    "max_rpm": 2800,
    "reference_speed_rpm": 2200,
    "limiting_speed_rpm": 2800,
    "weight_g": 10500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF 23128 (23128 CC/W33) is the spherical-roller choice for a 140 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 225×68 mm ISO 15 envelope. Digit by digit, 23128 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 31, and bore reference 28 resolving to 140 mm; 225 mm OD and 68 mm width are the matching ISO 15 boundary values. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Selection arithmetic: the C0/C ratio is about 1.37 (static 900 kN against dynamic 659 kN), typical of a spherical roller sized for heavy combined loads, and the 88 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 68 mm width across two roller rows needs the full charge.",
    "applications": [
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "At 140 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23100-series series at 140 mm bore (225×68 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23128; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23128; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 659/900 kN ratings are SKF catalogue values for this exact execution (23128 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23128 (cylindrical bore as listed, tapered-bore 23128 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23128 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23128?",
        "a": "The 23128 CC/W33 is a double-row spherical roller bearing with 140 mm bore, 225 mm outer diameter and 68 mm width (5.512 × 8.858 × 2.677 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 659 kN, C0 900 kN, fatigue load limit Pu 88 kN, reference speed 2,200 r/min, limiting speed 2,800 r/min, mass about 10500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23128 bore code work?",
        "a": "The last two digits of 23128 are bore code 28, so 28 × 5 = 140 mm bore. The 225 mm OD and 68 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23128?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23128 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23128K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23128 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23128",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23128-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on AHX3128 withdrawal sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23128",
      "23128 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23130",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23130 CC/W33",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 250,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 883,
    "static_load_kN": 1200,
    "fatigue_load_limit_kN": 114,
    "max_rpm": 2600,
    "reference_speed_rpm": 2000,
    "limiting_speed_rpm": 2600,
    "weight_g": 16000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23130 is a double-row spherical roller bearing in the 23100-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. Reading the designation: the leading 2 marks a spherical roller bearing, the 31 is the ISO 15 dimension series (dimension series 31 (medium OD, wide)), and the last two digits encode the 150 mm bore; the 250 mm OD and 80 mm width follow the ISO 15 general plan. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. At 2,000 r/min reference speed the 50.0 mm-section 23130 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 2,600 r/min as the mechanical ceiling. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 23130 CCK/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.",
    "applications": [
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "wind-turbine main shaft support"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "smearing on the roller-raceway contact during skid starts below the minimum load"
    ],
    "pitfalls": [
      "At 150 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23100-series series at 150 mm bore (250×80 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23130; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 883/1200 kN ratings are SKF catalogue values for this exact execution (23130 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23130 (cylindrical bore as listed, tapered-bore 23130 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23130 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23130?",
        "a": "The 23130 CC/W33 is a double-row spherical roller bearing with 150 mm bore, 250 mm outer diameter and 80 mm width (5.906 × 9.843 × 3.15 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 883 kN, C0 1200 kN, fatigue load limit Pu 114 kN, reference speed 2,000 r/min, limiting speed 2,600 r/min, mass about 16000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23130 bore code work?",
        "a": "The last two digits of 23130 are bore code 30, so 30 × 5 = 150 mm bore. The 250 mm OD and 80 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23130?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23130 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23130K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23130 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23130",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23130-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H3130 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C3130",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3130 shares the 150×250×80 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C3130-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3130 K shares the 150×250×80 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23130",
      "23130 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23132",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23132 CC/W33",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 270,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1029,
    "static_load_kN": 1370,
    "fatigue_load_limit_kN": 129,
    "max_rpm": 2400,
    "reference_speed_rpm": 1900,
    "limiting_speed_rpm": 2400,
    "weight_g": 20500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 23132 appears as 23132 CC/W33: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 160×270×86 mm to the ISO 15 boundary plan. Numbering ties the bearing to its envelope: 23132 means spherical-roller type, dimension series 31, 160 mm bore — which is why the 270×86 mm outline swaps dimensionally with other ISO 15 bearings of the same code. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. With C 1029 kN and C0 1370 kN, the 23132 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 86 mm width across two roller rows needs the full charge.",
    "applications": [
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "At 160 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23100-series series at 160 mm bore (270×86 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23132 pits long before its L10 life.",
      "Catalogue reference speed and limiting speed are different limits: the 1,900 r/min reference is a thermal criterion under load, while the 2,400 r/min limiting value is the mechanical ceiling — observe both.",
      "The 1029/1370 kN ratings are SKF catalogue values for this exact execution (23132 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23132 (cylindrical bore as listed, tapered-bore 23132 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23132 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23132?",
        "a": "The 23132 CC/W33 is a double-row spherical roller bearing with 160 mm bore, 270 mm outer diameter and 86 mm width (6.299 × 10.63 × 3.386 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1029 kN, C0 1370 kN, fatigue load limit Pu 129 kN, reference speed 1,900 r/min, limiting speed 2,400 r/min, mass about 20500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23132 bore code work?",
        "a": "The last two digits of 23132 are bore code 32, so 32 × 5 = 160 mm bore. The 270 mm OD and 86 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23132?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23132 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23132K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23132 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23132",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23132-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H3132 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C3132",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3132 shares the 160×270×86 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C3132-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3132 K shares the 160×270×86 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23132",
      "23132 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23134",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23134 CC/W33",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 280,
    "B_mm": 88,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1086,
    "static_load_kN": 1500,
    "fatigue_load_limit_kN": 137,
    "max_rpm": 2400,
    "reference_speed_rpm": 1800,
    "limiting_speed_rpm": 2400,
    "weight_g": 22000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 170 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 23134 under catalogue execution 23134 CC/W33: two barrel-roller rows on a sphered outer raceway. The code breaks down as type digit 2 (double-row spherical roller), dimension series 31 (dimension series 31 (medium OD, wide)), and bore code 34 = 170 mm; dimensions 170×280×88 mm therefore match the ISO 15 envelope. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Selection arithmetic: the C0/C ratio is about 1.38 (static 1500 kN against dynamic 1086 kN), typical of a spherical roller sized for heavy combined loads, and the 137 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 170 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.",
    "applications": [
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "smearing on the roller-raceway contact during skid starts below the minimum load"
    ],
    "pitfalls": [
      "At 170 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23100-series series at 170 mm bore (280×88 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.",
      "Shaft and housing fillets must clear the bearing chamfer so the 88 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 23134 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 1086/1500 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 1086/1500 kN ratings are SKF catalogue values for this exact execution (23134 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23134 (cylindrical bore as listed, tapered-bore 23134 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23134 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23134?",
        "a": "The 23134 CC/W33 is a double-row spherical roller bearing with 170 mm bore, 280 mm outer diameter and 88 mm width (6.693 × 11.024 × 3.465 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1086 kN, C0 1500 kN, fatigue load limit Pu 137 kN, reference speed 1,800 r/min, limiting speed 2,400 r/min, mass about 22000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23134 bore code work?",
        "a": "The last two digits of 23134 are bore code 34, so 34 × 5 = 170 mm bore. The 280 mm OD and 88 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23134?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23134 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23134K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23134 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23134",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23134-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H3134 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23134",
      "23134 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23136",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23136 CC/W33",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 300,
    "B_mm": 96,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1263,
    "static_load_kN": 1760,
    "fatigue_load_limit_kN": 160,
    "max_rpm": 2200,
    "reference_speed_rpm": 1700,
    "limiting_speed_rpm": 2200,
    "weight_g": 28000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number 23136 CC/W33 in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 180 mm shaft, dimension series 31 (medium OD, wide), with open execution and two pressed-steel cages with a floating guide ring. Digit by digit, 23136 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 31, and bore reference 36 resolving to 180 mm; 300 mm OD and 96 mm width are the matching ISO 15 boundary values. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Catalogue mass 28000 g for the 180×300×96 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. After mounting, swing the outer ring to confirm free self-alignment: the 23136 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.",
    "applications": [
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "At 180 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23100-series series at 180 mm bore (300×96 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23136; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 28000 g mass and 96 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23136.",
      "The 1263/1760 kN ratings are SKF catalogue values for this exact execution (23136 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23136 (cylindrical bore as listed, tapered-bore 23136 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23136 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23136?",
        "a": "The 23136 CC/W33 is a double-row spherical roller bearing with 180 mm bore, 300 mm outer diameter and 96 mm width (7.087 × 11.811 × 3.78 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1263 kN, C0 1760 kN, fatigue load limit Pu 160 kN, reference speed 1,700 r/min, limiting speed 2,200 r/min, mass about 28000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23136 bore code work?",
        "a": "The last two digits of 23136 are bore code 36, so 36 × 5 = 180 mm bore. The 300 mm OD and 96 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23136?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23136 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23136K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23136 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23136",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23136-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H3136 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C3136",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3136 shares the 180×300×96 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C3136-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3136 K shares the 180×300×96 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23136",
      "23136 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23138",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23138 CC/W33",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 190,
    "D_mm": 320,
    "B_mm": 104,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1456,
    "static_load_kN": 2080,
    "fatigue_load_limit_kN": 183,
    "max_rpm": 2000,
    "reference_speed_rpm": 1500,
    "limiting_speed_rpm": 2000,
    "weight_g": 35000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23138 CC/W33 is a 190×320×104 mm spherical roller bearing — the dimension series 31 (medium OD, wide) entry for a 190 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. On the SKF nameplate, 23138 follows the ISO 15 convention: 2 for the spherical roller type, 31 for the dimension series 31 (medium OD, wide), final digits 38 for the 190 mm bore. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Speed planning uses two different ceilings: 1,500 r/min thermal reference and 2,000 r/min mechanical limiting speed. Mount with the spherical bearing's self-alignment in mind: it compensates ≈ 0.5–2.5° of misalignment depending on series, but the shaft and housing seats still set the datum — a rotating inner ring on a 190 mm shaft typically takes a m6 seat with an H7 housing bore.",
    "applications": [
      "large mining crusher main shafts",
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "smearing on the roller-raceway contact during skid starts below the minimum load"
    ],
    "pitfalls": [
      "At 190 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23100-series series at 190 mm bore (320×104 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.",
      "Catalogue reference speed and limiting speed are different limits: the 1,500 r/min reference is a thermal criterion under load, while the 2,000 r/min limiting value is the mechanical ceiling — observe both.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 1456/2080 kN ratings are SKF catalogue values for this exact execution (23138 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23138 (cylindrical bore as listed, tapered-bore 23138 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23138 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23138?",
        "a": "The 23138 CC/W33 is a double-row spherical roller bearing with 190 mm bore, 320 mm outer diameter and 104 mm width (7.48 × 12.598 × 4.094 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1456 kN, C0 2080 kN, fatigue load limit Pu 183 kN, reference speed 1,500 r/min, limiting speed 2,000 r/min, mass about 35000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23138 bore code work?",
        "a": "The last two digits of 23138 are bore code 38, so 38 × 5 = 190 mm bore. The 320 mm OD and 104 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23138?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23138 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23138K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23138 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23138",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23138-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H3138 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C3138-V",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 3138 V shares the 190×320×104 mm envelope but catalogue C/C0 differ (1700/2550 kN vs 1456/2080 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C3138-KV",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 3138 KV shares the 190×320×104 mm envelope but catalogue C/C0 differ (1700/2550 kN vs 1456/2080 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23138",
      "23138 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23140",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23140 CC/W33",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 200,
    "D_mm": 340,
    "B_mm": 112,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1665,
    "static_load_kN": 2360,
    "fatigue_load_limit_kN": 204,
    "max_rpm": 1900,
    "reference_speed_rpm": 1500,
    "limiting_speed_rpm": 1900,
    "weight_g": 43000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23140 CC/W33 belongs to the SKF spherical roller range — the 200 mm bore entry in the 23100-series series (dimension series 31 (medium OD, wide)), dimensioned 340 mm OD and 112 mm wide. Numbering ties the bearing to its envelope: 23140 means spherical-roller type, dimension series 31, 200 mm bore — which is why the 340×112 mm outline swaps dimensionally with other ISO 15 bearings of the same code. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Selection arithmetic: the C0/C ratio is about 1.42 (static 2360 kN against dynamic 1665 kN), typical of a spherical roller sized for heavy combined loads, and the 204 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. After mounting, swing the outer ring to confirm free self-alignment: the 23140 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.",
    "applications": [
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals"
    ],
    "pitfalls": [
      "At 200 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23100-series series at 200 mm bore (340×112 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23140 pits long before its L10 life.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 1665/2360 kN ratings are SKF catalogue values for this exact execution (23140 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23140 (cylindrical bore as listed, tapered-bore 23140 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23140 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23140?",
        "a": "The 23140 CC/W33 is a double-row spherical roller bearing with 200 mm bore, 340 mm outer diameter and 112 mm width (7.874 × 13.386 × 4.409 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1665 kN, C0 2360 kN, fatigue load limit Pu 204 kN, reference speed 1,500 r/min, limiting speed 1,900 r/min, mass about 43000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23140 bore code work?",
        "a": "The last two digits of 23140 are bore code 40, so 40 × 5 = 200 mm bore. The 340 mm OD and 112 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23140?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23140 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23140K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23140 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23140",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23140-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on AH3140 withdrawal sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C3140",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3140 shares the 200×340×112 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C3140-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3140 K shares the 200×340×112 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23140",
      "23140 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23144",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23144 CC/W33",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 220,
    "D_mm": 370,
    "B_mm": 120,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1888,
    "static_load_kN": 2750,
    "fatigue_load_limit_kN": 232,
    "max_rpm": 1700,
    "reference_speed_rpm": 1300,
    "limiting_speed_rpm": 1700,
    "weight_g": 53500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23144 is a double-row spherical roller bearing in the 23100-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. Digit by digit, 23144 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 31, and bore reference 44 resolving to 220 mm; 370 mm OD and 120 mm width are the matching ISO 15 boundary values. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Speed planning uses two different ceilings: 1,300 r/min thermal reference and 1,700 r/min mechanical limiting speed. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.",
    "applications": [
      "large mining crusher main shafts",
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals"
    ],
    "pitfalls": [
      "At 220 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23100-series series at 220 mm bore (370×120 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23144; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "Shaft and housing fillets must clear the bearing chamfer so the 120 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 1888/2750 kN ratings are SKF catalogue values for this exact execution (23144 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23144 (cylindrical bore as listed, tapered-bore 23144 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23144 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23144?",
        "a": "The 23144 CC/W33 is a double-row spherical roller bearing with 220 mm bore, 370 mm outer diameter and 120 mm width (8.661 × 14.567 × 4.724 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1888 kN, C0 2750 kN, fatigue load limit Pu 232 kN, reference speed 1,300 r/min, limiting speed 1,700 r/min, mass about 53500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23144 bore code work?",
        "a": "The last two digits of 23144 are bore code 44, so 44 × 5 = 220 mm bore. The 370 mm OD and 120 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23144?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23144 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23144K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23144 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23144",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23144-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on AOH3144 withdrawal sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C3144",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3144 shares the 220×370×120 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C3144-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3144 K shares the 220×370×120 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23144",
      "23144 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23148",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23148 CC/W33",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 240,
    "D_mm": 400,
    "B_mm": 128,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 2187,
    "static_load_kN": 3200,
    "fatigue_load_limit_kN": 255,
    "max_rpm": 1600,
    "reference_speed_rpm": 1200,
    "limiting_speed_rpm": 1600,
    "weight_g": 66500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 240 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 23148 under catalogue execution 23148 CC/W33: two barrel-roller rows on a sphered outer raceway. Reading the designation: the leading 2 marks a spherical roller bearing, the 31 is the ISO 15 dimension series (dimension series 31 (medium OD, wide)), and the last two digits encode the 240 mm bore; the 400 mm OD and 128 mm width follow the ISO 15 general plan. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. The 80.0 mm radial section height ((400−240)/2) and 66500 g catalogue mass frame a 240 mm bore bearing rated at 2187 kN C — roughly 9.11 kN of dynamic capacity per millimetre of bore before application factors. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 23148 CCK/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.",
    "applications": [
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals"
    ],
    "pitfalls": [
      "At 240 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23100-series series at 240 mm bore (400×128 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.",
      "The 23148 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 2187/3200 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "Catalogue reference speed and limiting speed are different limits: the 1,200 r/min reference is a thermal criterion under load, while the 1,600 r/min limiting value is the mechanical ceiling — observe both.",
      "The 2187/3200 kN ratings are SKF catalogue values for this exact execution (23148 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23148 (cylindrical bore as listed, tapered-bore 23148 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23148 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23148?",
        "a": "The 23148 CC/W33 is a double-row spherical roller bearing with 240 mm bore, 400 mm outer diameter and 128 mm width (9.449 × 15.748 × 5.039 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2187 kN, C0 3200 kN, fatigue load limit Pu 255 kN, reference speed 1,200 r/min, limiting speed 1,600 r/min, mass about 66500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23148 bore code work?",
        "a": "The last two digits of 23148 are bore code 48, so 48 × 5 = 240 mm bore. The 400 mm OD and 128 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23148?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23148 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23148K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23148 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23148",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23148-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on AOH3148 withdrawal sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C3148",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3148 shares the 240×400×128 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C3148-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3148 K shares the 240×400×128 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23148",
      "23148 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23152",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23152 CC/W33",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 260,
    "D_mm": 440,
    "B_mm": 144,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 2664,
    "static_load_kN": 3900,
    "fatigue_load_limit_kN": 290,
    "max_rpm": 1400,
    "reference_speed_rpm": 1100,
    "limiting_speed_rpm": 1400,
    "weight_g": 90500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23152 CC/W33 is a 260×440×144 mm spherical roller bearing — the dimension series 31 (medium OD, wide) entry for a 260 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. Digit by digit, 23152 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 31, and bore reference 52 resolving to 260 mm; 440 mm OD and 144 mm width are the matching ISO 15 boundary values. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. The 290 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.46 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 23152 CCK/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.",
    "applications": [
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "smearing on the roller-raceway contact during skid starts below the minimum load"
    ],
    "pitfalls": [
      "At 260 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23100-series series at 260 mm bore (440×144 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23152; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 23152 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 2664/3900 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 2664/3900 kN ratings are SKF catalogue values for this exact execution (23152 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23152 (cylindrical bore as listed, tapered-bore 23152 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23152 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23152?",
        "a": "The 23152 CC/W33 is a double-row spherical roller bearing with 260 mm bore, 440 mm outer diameter and 144 mm width (10.236 × 17.323 × 5.669 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2664 kN, C0 3900 kN, fatigue load limit Pu 290 kN, reference speed 1,100 r/min, limiting speed 1,400 r/min, mass about 90500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23152 bore code work?",
        "a": "The last two digits of 23152 are bore code 52, so 52 × 5 = 260 mm bore. The 440 mm OD and 144 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23152?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23152 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23152K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23152 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23152",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23152-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on OH3152 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C3152",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3152 shares the 260×440×144 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C3152-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3152 K shares the 260×440×144 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23152",
      "23152 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23156",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23156 CC/W33",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 280,
    "D_mm": 460,
    "B_mm": 146,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 2784,
    "static_load_kN": 4250,
    "fatigue_load_limit_kN": 335,
    "max_rpm": 1300,
    "reference_speed_rpm": 1000,
    "limiting_speed_rpm": 1300,
    "weight_g": 97000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF 23156 (23156 CC/W33) is the spherical-roller choice for a 280 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 460×146 mm ISO 15 envelope. Reading the designation: the leading 2 marks a spherical roller bearing, the 31 is the ISO 15 dimension series (dimension series 31 (medium OD, wide)), and the last two digits encode the 280 mm bore; the 460 mm OD and 146 mm width follow the ISO 15 general plan. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. At 1,000 r/min reference speed the 90.0 mm-section 23156 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 1,300 r/min as the mechanical ceiling. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 280 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.",
    "applications": [
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "wind-turbine main shaft support"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "smearing on the roller-raceway contact during skid starts below the minimum load"
    ],
    "pitfalls": [
      "At 280 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23100-series series at 280 mm bore (460×146 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.",
      "The 23156 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 2784/4250 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 2784/4250 kN ratings are SKF catalogue values for this exact execution (23156 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23156 (cylindrical bore as listed, tapered-bore 23156 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23156 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23156?",
        "a": "The 23156 CC/W33 is a double-row spherical roller bearing with 280 mm bore, 460 mm outer diameter and 146 mm width (11.024 × 18.11 × 5.748 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2784 kN, C0 4250 kN, fatigue load limit Pu 335 kN, reference speed 1,000 r/min, limiting speed 1,300 r/min, mass about 97000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23156 bore code work?",
        "a": "The last two digits of 23156 are bore code 56, so 56 × 5 = 280 mm bore. The 460 mm OD and 146 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23156?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23156 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23156K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23156 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23156",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23156-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on OH3156 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C3156",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3156 shares the 280×460×146 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C3156-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3156 K shares the 280×460×146 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23156",
      "23156 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23160",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23160 CC/W33",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 300,
    "D_mm": 500,
    "B_mm": 160,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 3368,
    "static_load_kN": 5100,
    "fatigue_load_limit_kN": 380,
    "max_rpm": 1200,
    "reference_speed_rpm": 950,
    "limiting_speed_rpm": 1200,
    "weight_g": 125000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 23160 appears as 23160 CC/W33: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 300×500×160 mm to the ISO 15 boundary plan. Digit by digit, 23160 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 31, and bore reference 60 resolving to 300 mm; 500 mm OD and 160 mm width are the matching ISO 15 boundary values. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. The 100.0 mm radial section height ((500−300)/2) and 125000 g catalogue mass frame a 300 mm bore bearing rated at 3368 kN C — roughly 11.23 kN of dynamic capacity per millimetre of bore before application factors. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 300 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.",
    "applications": [
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "At 300 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23100-series series at 300 mm bore (500×160 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23160; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23160 pits long before its L10 life.",
      "The 3368/5100 kN ratings are SKF catalogue values for this exact execution (23160 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23160 (cylindrical bore as listed, tapered-bore 23160 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23160 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23160?",
        "a": "The 23160 CC/W33 is a double-row spherical roller bearing with 300 mm bore, 500 mm outer diameter and 160 mm width (11.811 × 19.685 × 6.299 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 3368 kN, C0 5100 kN, fatigue load limit Pu 380 kN, reference speed 950 r/min, limiting speed 1,200 r/min, mass about 125000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23160 bore code work?",
        "a": "The last two digits of 23160 are bore code 60, so 60 × 5 = 300 mm bore. The 500 mm OD and 160 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23160?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23160 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23160K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23160 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23160",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23160-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on OH3160 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C3160",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3160 shares the 300×500×160 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C3160-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3160 K shares the 300×500×160 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23160",
      "23160 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23164",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23164 CC/W33",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 320,
    "D_mm": 540,
    "B_mm": 176,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 3923,
    "static_load_kN": 6000,
    "fatigue_load_limit_kN": 440,
    "max_rpm": 1100,
    "reference_speed_rpm": 850,
    "limiting_speed_rpm": 1100,
    "weight_g": 165000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number 23164 CC/W33 in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 320 mm shaft, dimension series 31 (medium OD, wide), with open execution and two pressed-steel cages with a floating guide ring. Reading the designation: the leading 2 marks a spherical roller bearing, the 31 is the ISO 15 dimension series (dimension series 31 (medium OD, wide)), and the last two digits encode the 320 mm bore; the 540 mm OD and 176 mm width follow the ISO 15 general plan. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. With C 3923 kN and C0 6000 kN, the 23164 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. Mount with the spherical bearing's self-alignment in mind: it compensates ≈ 0.5–2.5° of misalignment depending on series, but the shaft and housing seats still set the datum — a rotating inner ring on a 320 mm shaft typically takes a m6 seat with an H7 housing bore.",
    "applications": [
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "At 320 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23100-series series at 320 mm bore (540×176 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.",
      "The 23164 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 3923/6000 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23164; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 3923/6000 kN ratings are SKF catalogue values for this exact execution (23164 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23164 (cylindrical bore as listed, tapered-bore 23164 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23164 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23164?",
        "a": "The 23164 CC/W33 is a double-row spherical roller bearing with 320 mm bore, 540 mm outer diameter and 176 mm width (12.598 × 21.26 × 6.929 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 3923 kN, C0 6000 kN, fatigue load limit Pu 440 kN, reference speed 850 r/min, limiting speed 1,100 r/min, mass about 165000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23164 bore code work?",
        "a": "The last two digits of 23164 are bore code 64, so 64 × 5 = 320 mm bore. The 540 mm OD and 176 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23164?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23164 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23164K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23164 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23164",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23164-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on OH3164 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C3164-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3164 M shares the 320×540×176 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C3164-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3164 KM shares the 320×540×176 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23164",
      "23164 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23168",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23168 CC/W33",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 340,
    "D_mm": 580,
    "B_mm": 190,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 4445,
    "static_load_kN": 6800,
    "fatigue_load_limit_kN": 480,
    "max_rpm": 1000,
    "reference_speed_rpm": 800,
    "limiting_speed_rpm": 1000,
    "weight_g": 210000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23168 CC/W33 belongs to the SKF spherical roller range — the 340 mm bore entry in the 23100-series series (dimension series 31 (medium OD, wide)), dimensioned 580 mm OD and 190 mm wide. The code breaks down as type digit 2 (double-row spherical roller), dimension series 31 (dimension series 31 (medium OD, wide)), and bore code 68 = 340 mm; dimensions 340×580×190 mm therefore match the ISO 15 envelope. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Catalogue mass 210000 g for the 340×580×190 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. A 340 mm rotating inner ring usually runs m6 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.",
    "applications": [
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "At 340 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23100-series series at 340 mm bore (580×190 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 23168 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 4445/6800 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 4445/6800 kN ratings are SKF catalogue values for this exact execution (23168 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23168 (cylindrical bore as listed, tapered-bore 23168 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23168 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23168?",
        "a": "The 23168 CC/W33 is a double-row spherical roller bearing with 340 mm bore, 580 mm outer diameter and 190 mm width (13.386 × 22.835 × 7.48 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 4445 kN, C0 6800 kN, fatigue load limit Pu 480 kN, reference speed 800 r/min, limiting speed 1,000 r/min, mass about 210000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23168 bore code work?",
        "a": "The last two digits of 23168 are bore code 68, so 68 × 5 = 340 mm bore. The 580 mm OD and 190 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23168?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23168 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23168K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23168 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23168",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23168-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on OH3168 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C3168-M",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 3168 M shares the 340×580×190 mm envelope but catalogue C/C0 differ (4900/7500 kN vs 4445/6800 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C3168-KM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 3168 KM shares the 340×580×190 mm envelope but catalogue C/C0 differ (4900/7500 kN vs 4445/6800 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23168",
      "23168 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23172",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23172 CC/W33",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 360,
    "D_mm": 600,
    "B_mm": 192,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 4515,
    "static_load_kN": 6950,
    "fatigue_load_limit_kN": 490,
    "max_rpm": 1000,
    "reference_speed_rpm": 750,
    "limiting_speed_rpm": 1000,
    "weight_g": 220000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23172 is a double-row spherical roller bearing in the 23100-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. Reading the designation: the leading 2 marks a spherical roller bearing, the 31 is the ISO 15 dimension series (dimension series 31 (medium OD, wide)), and the last two digits encode the 360 mm bore; the 600 mm OD and 192 mm width follow the ISO 15 general plan. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Selection arithmetic: the C0/C ratio is about 1.54 (static 6950 kN against dynamic 4515 kN), typical of a spherical roller sized for heavy combined loads, and the 490 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. A 360 mm rotating inner ring usually runs m6 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.",
    "applications": [
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "At 360 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23100-series series at 360 mm bore (600×192 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.",
      "The 23172 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 4515/6950 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 220000 g mass and 192 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23172.",
      "The 4515/6950 kN ratings are SKF catalogue values for this exact execution (23172 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23172 (cylindrical bore as listed, tapered-bore 23172 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23172 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23172?",
        "a": "The 23172 CC/W33 is a double-row spherical roller bearing with 360 mm bore, 600 mm outer diameter and 192 mm width (14.173 × 23.622 × 7.559 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 4515 kN, C0 6950 kN, fatigue load limit Pu 490 kN, reference speed 750 r/min, limiting speed 1,000 r/min, mass about 220000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23172 bore code work?",
        "a": "The last two digits of 23172 are bore code 72, so 72 × 5 = 360 mm bore. The 600 mm OD and 192 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23172?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23172 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23172K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23172 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23172",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23172-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on OH3172 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C3172-M",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 3172 M shares the 360×600×192 mm envelope but catalogue C/C0 differ (5000/8000 kN vs 4515/6950 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C3172-KM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 3172 KM shares the 360×600×192 mm envelope but catalogue C/C0 differ (5000/8000 kN vs 4515/6950 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23172",
      "23172 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23176",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23176 CA/W33",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 380,
    "D_mm": 620,
    "B_mm": 194,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 4561,
    "static_load_kN": 7100,
    "fatigue_load_limit_kN": 500,
    "max_rpm": 1000,
    "reference_speed_rpm": 560,
    "limiting_speed_rpm": 1000,
    "weight_g": 230000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 380 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 23176 under catalogue execution 23176 CA/W33: two barrel-roller rows on a sphered outer raceway. The code breaks down as type digit 2 (double-row spherical roller), dimension series 31 (dimension series 31 (medium OD, wide)), and bore code 76 = 380 mm; dimensions 380×620×194 mm therefore match the ISO 15 envelope. In SKF suffix language, CA/W33 means the brass-cage CA execution — often preferred for the largest bores and for shock/vibration duty where a rigid machined cage matters; W33 adds the relubrication groove. The sealed 2CS5 and vibrating-screen VA405 are separate executions. Speed planning uses two different ceilings: 560 r/min thermal reference and 1,000 r/min mechanical limiting speed. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 194 mm width across two roller rows needs the full charge.",
    "applications": [
      "large mining crusher main shafts",
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "At 380 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23100-series series at 380 mm bore (620×194 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23176 pits long before its L10 life.",
      "The 4561/7100 kN ratings are SKF catalogue values for this exact execution (23176 CA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23176 (cylindrical bore as listed, tapered-bore 23176 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23176 CA/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23176?",
        "a": "The 23176 CA/W33 is a double-row spherical roller bearing with 380 mm bore, 620 mm outer diameter and 194 mm width (14.961 × 24.409 × 7.638 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 4561 kN, C0 7100 kN, fatigue load limit Pu 500 kN, reference speed 560 r/min, limiting speed 1,000 r/min, mass about 230000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)."
      },
      {
        "q": "How does the 23176 bore code work?",
        "a": "The last two digits of 23176 are bore code 76, so 76 × 5 = 380 mm bore. The 620 mm OD and 194 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CA/W33 suffix mean on 23176?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23176 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23176K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23176 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23176",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23176-CAK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on OH3176 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C3176-MB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3176 MB shares the 380×620×194 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C3176-KMB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3176 KMB shares the 380×620×194 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23176",
      "23176 CA/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23180",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23180 CA/W33",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 400,
    "D_mm": 650,
    "B_mm": 200,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 4864,
    "static_load_kN": 7650,
    "fatigue_load_limit_kN": 530,
    "max_rpm": 950,
    "reference_speed_rpm": 530,
    "limiting_speed_rpm": 950,
    "weight_g": 265000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23180 CA/W33 is a 400×650×200 mm spherical roller bearing — the dimension series 31 (medium OD, wide) entry for a 400 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. Reading the designation: the leading 2 marks a spherical roller bearing, the 31 is the ISO 15 dimension series (dimension series 31 (medium OD, wide)), and the last two digits encode the 400 mm bore; the 650 mm OD and 200 mm width follow the ISO 15 general plan. In SKF suffix language, CA/W33 means the brass-cage CA execution — often preferred for the largest bores and for shock/vibration duty where a rigid machined cage matters; W33 adds the relubrication groove. The sealed 2CS5 and vibrating-screen VA405 are separate executions. Catalogue mass 265000 g for the 400×650×200 mm open execution covers the a one-piece machined brass cage guided on the inner ring (CA design); tapered-bore and sealed variants differ in mass and carry their own order numbers. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 200 mm width across two roller rows needs the full charge.",
    "applications": [
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals"
    ],
    "pitfalls": [
      "At 400 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23100-series series at 400 mm bore (650×200 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.",
      "The 23180 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 4864/7650 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "Shaft and housing fillets must clear the bearing chamfer so the 200 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 4864/7650 kN ratings are SKF catalogue values for this exact execution (23180 CA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23180 (cylindrical bore as listed, tapered-bore 23180 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23180 CA/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23180?",
        "a": "The 23180 CA/W33 is a double-row spherical roller bearing with 400 mm bore, 650 mm outer diameter and 200 mm width (15.748 × 25.591 × 7.874 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 4864 kN, C0 7650 kN, fatigue load limit Pu 530 kN, reference speed 530 r/min, limiting speed 950 r/min, mass about 265000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)."
      },
      {
        "q": "How does the 23180 bore code work?",
        "a": "The last two digits of 23180 are bore code 80, so 80 × 5 = 400 mm bore. The 650 mm OD and 200 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CA/W33 suffix mean on 23180?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23180 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23180K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23180 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23180",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23180-CAK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on OH3180 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C3180-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3180 M shares the 400×650×200 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C3180-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3180 KM shares the 400×650×200 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23180",
      "23180 CA/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23184",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23184 CJ/W33",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 420,
    "D_mm": 700,
    "B_mm": 224,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 5919,
    "static_load_kN": 9300,
    "fatigue_load_limit_kN": 620,
    "max_rpm": 900,
    "reference_speed_rpm": 480,
    "limiting_speed_rpm": 900,
    "weight_g": 350000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF 23184 (23184 CJ/W33) is the spherical-roller choice for a 420 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 700×224 mm ISO 15 envelope. The code breaks down as type digit 2 (double-row spherical roller), dimension series 31 (dimension series 31 (medium OD, wide)), and bore code 84 = 420 mm; dimensions 420×700×224 mm therefore match the ISO 15 envelope. In SKF suffix language, CJ/W33 is the newer stamped-window-steel-cage execution; it replaces many CC applications with lower friction, while the sealed 2CS5 and vibrating-screen VA405 remain separate order numbers. The 620 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.57 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. After mounting, swing the outer ring to confirm free self-alignment: the 23184 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.",
    "applications": [
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals"
    ],
    "pitfalls": [
      "At 420 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23100-series series at 420 mm bore (700×224 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "Catalogue reference speed and limiting speed are different limits: the 480 r/min reference is a thermal criterion under load, while the 900 r/min limiting value is the mechanical ceiling — observe both.",
      "The 5919/9300 kN ratings are SKF catalogue values for this exact execution (23184 CJ/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23184 (cylindrical bore as listed, tapered-bore 23184 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23184 CJ/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23184?",
        "a": "The 23184 CJ/W33 is a double-row spherical roller bearing with 420 mm bore, 700 mm outer diameter and 224 mm width (16.535 × 27.559 × 8.819 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 5919 kN, C0 9300 kN, fatigue load limit Pu 620 kN, reference speed 480 r/min, limiting speed 900 r/min, mass about 350000 g. It is an open, self-aligning bearing with a stamped sheet-steel window-type cage with low-friction guidance (CJ design)."
      },
      {
        "q": "How does the 23184 bore code work?",
        "a": "The last two digits of 23184 are bore code 84, so 84 × 5 = 420 mm bore. The 700 mm OD and 224 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CJ/W33 suffix mean on 23184?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23184 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23184K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23184 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23184",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23184-CKJ-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on OH3184 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C3184-M",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 3184 M shares the 420×700×224 mm envelope but catalogue C/C0 differ (6000/10400 kN vs 5919/9300 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C3184-KM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 3184 KM shares the 420×700×224 mm envelope but catalogue C/C0 differ (6000/10400 kN vs 5919/9300 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23184",
      "23184 CJ/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23188",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23188 CA/W33",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 440,
    "D_mm": 720,
    "B_mm": 226,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 6215,
    "static_load_kN": 10000,
    "fatigue_load_limit_kN": 670,
    "max_rpm": 850,
    "reference_speed_rpm": 450,
    "limiting_speed_rpm": 850,
    "weight_g": 360000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 23188 appears as 23188 CA/W33: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 440×720×226 mm to the ISO 15 boundary plan. On the SKF nameplate, 23188 follows the ISO 15 convention: 2 for the spherical roller type, 31 for the dimension series 31 (medium OD, wide), final digits 88 for the 440 mm bore. In SKF suffix language, CA/W33 means the brass-cage CA execution — often preferred for the largest bores and for shock/vibration duty where a rigid machined cage matters; W33 adds the relubrication groove. The sealed 2CS5 and vibrating-screen VA405 are separate executions. At 450 r/min reference speed the 140.0 mm-section 23188 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 850 r/min as the mechanical ceiling. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.",
    "applications": [
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "wind-turbine main shaft support"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals"
    ],
    "pitfalls": [
      "At 440 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23100-series series at 440 mm bore (720×226 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.",
      "Shaft and housing fillets must clear the bearing chamfer so the 226 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 360000 g mass and 226 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23188.",
      "The 6215/10000 kN ratings are SKF catalogue values for this exact execution (23188 CA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23188 (cylindrical bore as listed, tapered-bore 23188 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23188 CA/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23188?",
        "a": "The 23188 CA/W33 is a double-row spherical roller bearing with 440 mm bore, 720 mm outer diameter and 226 mm width (17.323 × 28.346 × 8.898 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 6215 kN, C0 10000 kN, fatigue load limit Pu 670 kN, reference speed 450 r/min, limiting speed 850 r/min, mass about 360000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)."
      },
      {
        "q": "How does the 23188 bore code work?",
        "a": "The last two digits of 23188 are bore code 88, so 88 × 5 = 440 mm bore. The 720 mm OD and 226 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CA/W33 suffix mean on 23188?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23188 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23188K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23188 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23188",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23188-CAK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on OH3188 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C3188-MB",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 3188 MB shares the 440×720×226 mm envelope but catalogue C/C0 differ (6700/11400 kN vs 6215/10000 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C3188-KMB",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 3188 KMB shares the 440×720×226 mm envelope but catalogue C/C0 differ (6700/11400 kN vs 6215/10000 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23188",
      "23188 CA/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23192",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23192 CA/W33",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 460,
    "D_mm": 760,
    "B_mm": 240,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 6760,
    "static_load_kN": 10800,
    "fatigue_load_limit_kN": 680,
    "max_rpm": 800,
    "reference_speed_rpm": 430,
    "limiting_speed_rpm": 800,
    "weight_g": 440000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number 23192 CA/W33 in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 460 mm shaft, dimension series 31 (medium OD, wide), with open execution and a one-piece machined brass cage guided on the inner ring (CA design). The code breaks down as type digit 2 (double-row spherical roller), dimension series 31 (dimension series 31 (medium OD, wide)), and bore code 92 = 460 mm; dimensions 460×760×240 mm therefore match the ISO 15 envelope. In SKF suffix language, CA/W33 means the brass-cage CA execution — often preferred for the largest bores and for shock/vibration duty where a rigid machined cage matters; W33 adds the relubrication groove. The sealed 2CS5 and vibrating-screen VA405 are separate executions. The 150.0 mm radial section height ((760−460)/2) and 440000 g catalogue mass frame a 460 mm bore bearing rated at 6760 kN C — roughly 14.70 kN of dynamic capacity per millimetre of bore before application factors. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.",
    "applications": [
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "smearing on the roller-raceway contact during skid starts below the minimum load"
    ],
    "pitfalls": [
      "At 460 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23100-series series at 460 mm bore (760×240 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 6760/10800 kN ratings are SKF catalogue values for this exact execution (23192 CA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23192 (cylindrical bore as listed, tapered-bore 23192 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23192 CA/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23192?",
        "a": "The 23192 CA/W33 is a double-row spherical roller bearing with 460 mm bore, 760 mm outer diameter and 240 mm width (18.11 × 29.921 × 9.449 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 6760 kN, C0 10800 kN, fatigue load limit Pu 680 kN, reference speed 430 r/min, limiting speed 800 r/min, mass about 440000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)."
      },
      {
        "q": "How does the 23192 bore code work?",
        "a": "The last two digits of 23192 are bore code 92, so 92 × 5 = 460 mm bore. The 760 mm OD and 240 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CA/W33 suffix mean on 23192?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23192 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23192K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23192 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23192",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23192-CAK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on AOHX3192 withdrawal sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C3192-M",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 3192 M shares the 460×760×240 mm envelope but catalogue C/C0 differ (6800/12000 kN vs 6760/10800 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C3192-KM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 3192 KM shares the 460×760×240 mm envelope but catalogue C/C0 differ (6800/12000 kN vs 6760/10800 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23192",
      "23192 CA/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23196",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23196 CA/W33",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 480,
    "D_mm": 790,
    "B_mm": 248,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 7362,
    "static_load_kN": 12000,
    "fatigue_load_limit_kN": 780,
    "max_rpm": 750,
    "reference_speed_rpm": 400,
    "limiting_speed_rpm": 750,
    "weight_g": 485000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23196 CA/W33 belongs to the SKF spherical roller range — the 480 mm bore entry in the 23100-series series (dimension series 31 (medium OD, wide)), dimensioned 790 mm OD and 248 mm wide. On the SKF nameplate, 23196 follows the ISO 15 convention: 2 for the spherical roller type, 31 for the dimension series 31 (medium OD, wide), final digits 96 for the 480 mm bore. In SKF suffix language, CA/W33 means the brass-cage CA execution — often preferred for the largest bores and for shock/vibration duty where a rigid machined cage matters; W33 adds the relubrication groove. The sealed 2CS5 and vibrating-screen VA405 are separate executions. With C 7362 kN and C0 12000 kN, the 23196 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 23196 CCK/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.",
    "applications": [
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "smearing on the roller-raceway contact during skid starts below the minimum load"
    ],
    "pitfalls": [
      "At 480 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23100-series series at 480 mm bore (790×248 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.",
      "Shaft and housing fillets must clear the bearing chamfer so the 248 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "Shaft and housing fillets must clear the bearing chamfer so the 248 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 7362/12000 kN ratings are SKF catalogue values for this exact execution (23196 CA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23196 (cylindrical bore as listed, tapered-bore 23196 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23196 CA/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23196?",
        "a": "The 23196 CA/W33 is a double-row spherical roller bearing with 480 mm bore, 790 mm outer diameter and 248 mm width (18.898 × 31.102 × 9.764 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 7362 kN, C0 12000 kN, fatigue load limit Pu 780 kN, reference speed 400 r/min, limiting speed 750 r/min, mass about 485000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)."
      },
      {
        "q": "How does the 23196 bore code work?",
        "a": "The last two digits of 23196 are bore code 96, so 96 × 5 = 480 mm bore. The 790 mm OD and 248 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CA/W33 suffix mean on 23196?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23196 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23196K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23196 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23196",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23196-CAK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on AOHX3196 withdrawal sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C3196-MB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3196 MB shares the 480×790×248 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C3196-KMB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3196 KMB shares the 480×790×248 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23196",
      "23196 CA/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23218",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23218 CC/W33",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 90,
    "D_mm": 160,
    "B_mm": 52.4,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 372,
    "static_load_kN": 440,
    "fatigue_load_limit_kN": 48,
    "max_rpm": 3800,
    "reference_speed_rpm": 2800,
    "limiting_speed_rpm": 3800,
    "weight_g": 4650,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 90 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 23218 under catalogue execution 23218 CC/W33: two barrel-roller rows on a sphered outer raceway. Digit by digit, 23218 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 32, and bore reference 18 resolving to 90 mm; 160 mm OD and 52.4 mm width are the matching ISO 15 boundary values. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Catalogue mass 4650 g for the 90×160×52.4 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.",
    "applications": [
      "marine propulsion and thruster shafts",
      "cement-mill trunnion and drive shafts",
      "heavy conveyor head shafts in mining",
      "jaw and cone crusher main shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Mount the 90 mm bore 23218 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 23200-series series at 90 mm bore (160×52.4 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 52.4 mm width changes abutment spacing, even though the 160 mm OD matches.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23218 pits long before its L10 life.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23218; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 372/440 kN ratings are SKF catalogue values for this exact execution (23218 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23218 (cylindrical bore as listed, tapered-bore 23218 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23218 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23218?",
        "a": "The 23218 CC/W33 is a double-row spherical roller bearing with 90 mm bore, 160 mm outer diameter and 52.4 mm width (3.543 × 6.299 × 2.063 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 372 kN, C0 440 kN, fatigue load limit Pu 48 kN, reference speed 2,800 r/min, limiting speed 3,800 r/min, mass about 4650 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23218 bore code work?",
        "a": "The last two digits of 23218 are bore code 18, so 18 × 5 = 90 mm bore. The 160 mm OD and 52.4 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23218?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23218 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23218K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23218 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23218",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23218-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H2318 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23218",
      "23218 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23220",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23220 CC/W33",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 100,
    "D_mm": 180,
    "B_mm": 60.3,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 498,
    "static_load_kN": 600,
    "fatigue_load_limit_kN": 63,
    "max_rpm": 3400,
    "reference_speed_rpm": 2400,
    "limiting_speed_rpm": 3400,
    "weight_g": 6850,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number 23220 CC/W33 in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 100 mm shaft, dimension series 32 (medium OD, extra wide), with open execution and two pressed-steel cages with a floating guide ring. Reading the designation: the leading 2 marks a spherical roller bearing, the 32 is the ISO 15 dimension series (dimension series 32 (medium OD, extra wide)), and the last two digits encode the 100 mm bore; the 180 mm OD and 60.3 mm width follow the ISO 15 general plan. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. With C 498 kN and C0 600 kN, the 23220 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. Mount with the spherical bearing's self-alignment in mind: it compensates ≈ 0.5–2.5° of misalignment depending on series, but the shaft and housing seats still set the datum — a rotating inner ring on a 100 mm shaft typically takes a k5 seat with an H7 housing bore.",
    "applications": [
      "large vibrating screens and feeders",
      "marine propulsion and thruster shafts",
      "cement-mill trunnion and drive shafts",
      "heavy conveyor head shafts in mining"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "smearing on the roller-raceway contact during skid starts below the minimum load"
    ],
    "pitfalls": [
      "Mount the 100 mm bore 23220 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 23200-series series at 100 mm bore (180×60.3 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 60.3 mm width changes abutment spacing, even though the 180 mm OD matches.",
      "The 23220 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 498/600 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23220; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 498/600 kN ratings are SKF catalogue values for this exact execution (23220 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23220 (cylindrical bore as listed, tapered-bore 23220 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23220 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23220?",
        "a": "The 23220 CC/W33 is a double-row spherical roller bearing with 100 mm bore, 180 mm outer diameter and 60.3 mm width (3.937 × 7.087 × 2.374 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 498 kN, C0 600 kN, fatigue load limit Pu 63 kN, reference speed 2,400 r/min, limiting speed 3,400 r/min, mass about 6850 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23220 bore code work?",
        "a": "The last two digits of 23220 are bore code 20, so 20 × 5 = 100 mm bore. The 180 mm OD and 60.3 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23220?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23220 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23220K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23220 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23220",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23220-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H2320 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23220",
      "23220 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23222",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23222 CC/W33",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 200,
    "B_mm": 69.8,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 626,
    "static_load_kN": 765,
    "fatigue_load_limit_kN": 76.5,
    "max_rpm": 3200,
    "reference_speed_rpm": 2200,
    "limiting_speed_rpm": 3200,
    "weight_g": 9850,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23222 CC/W33 is a 110×200×69.8 mm spherical roller bearing — the dimension series 32 (medium OD, extra wide) entry for a 110 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. Numbering ties the bearing to its envelope: 23222 means spherical-roller type, dimension series 32, 110 mm bore — which is why the 200×69.8 mm outline swaps dimensionally with other ISO 15 bearings of the same code. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Selection arithmetic: the C0/C ratio is about 1.22 (static 765 kN against dynamic 626 kN), typical of a spherical roller sized for heavy combined loads, and the 76.5 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.",
    "applications": [
      "jaw and cone crusher main shafts",
      "paper-machine press and dryer rolls",
      "rolling-mill pinion and back-up shafts",
      "large vibrating screens and feeders"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Mount the 110 mm bore 23222 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 23200-series series at 110 mm bore (200×69.8 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 69.8 mm width changes abutment spacing, even though the 200 mm OD matches.",
      "The 9850 g mass and 69.8 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23222.",
      "Catalogue reference speed and limiting speed are different limits: the 2,200 r/min reference is a thermal criterion under load, while the 3,200 r/min limiting value is the mechanical ceiling — observe both.",
      "The 626/765 kN ratings are SKF catalogue values for this exact execution (23222 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23222 (cylindrical bore as listed, tapered-bore 23222 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23222 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23222?",
        "a": "The 23222 CC/W33 is a double-row spherical roller bearing with 110 mm bore, 200 mm outer diameter and 69.8 mm width (4.331 × 7.874 × 2.748 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 626 kN, C0 765 kN, fatigue load limit Pu 76.5 kN, reference speed 2,200 r/min, limiting speed 3,200 r/min, mass about 9850 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23222 bore code work?",
        "a": "The last two digits of 23222 are bore code 22, so 22 × 5 = 110 mm bore. The 200 mm OD and 69.8 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23222?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23222 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23222K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23222 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23222",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23222-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H2322 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23222",
      "23222 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23224",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23224 CC/W33",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 215,
    "B_mm": 76,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 732,
    "static_load_kN": 930,
    "fatigue_load_limit_kN": 93,
    "max_rpm": 2800,
    "reference_speed_rpm": 2000,
    "limiting_speed_rpm": 2800,
    "weight_g": 12000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23224 CC/W33 belongs to the SKF spherical roller range — the 120 mm bore entry in the 23200-series series (dimension series 32 (medium OD, extra wide)), dimensioned 215 mm OD and 76 mm wide. The code breaks down as type digit 2 (double-row spherical roller), dimension series 32 (dimension series 32 (medium OD, extra wide)), and bore code 24 = 120 mm; dimensions 120×215×76 mm therefore match the ISO 15 envelope. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Catalogue mass 12000 g for the 120×215×76 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. A 120 mm rotating inner ring usually runs m6 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.",
    "applications": [
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "smearing on the roller-raceway contact during skid starts below the minimum load"
    ],
    "pitfalls": [
      "At 120 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23200-series series at 120 mm bore (215×76 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 76 mm width changes abutment spacing, even though the 215 mm OD matches.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 23224 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 732/930 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 732/930 kN ratings are SKF catalogue values for this exact execution (23224 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23224 (cylindrical bore as listed, tapered-bore 23224 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23224 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23224?",
        "a": "The 23224 CC/W33 is a double-row spherical roller bearing with 120 mm bore, 215 mm outer diameter and 76 mm width (4.724 × 8.465 × 2.992 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 732 kN, C0 930 kN, fatigue load limit Pu 93 kN, reference speed 2,000 r/min, limiting speed 2,800 r/min, mass about 12000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23224 bore code work?",
        "a": "The last two digits of 23224 are bore code 24, so 24 × 5 = 120 mm bore. The 215 mm OD and 76 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23224?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23224 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23224K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23224 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23224",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23224-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on AHX3224 withdrawal sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C3224",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3224 shares the 120×215×76 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C3224-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3224 K shares the 120×215×76 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23224",
      "23224 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23226",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23226 CC/W33",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 230,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 826,
    "static_load_kN": 1060,
    "fatigue_load_limit_kN": 104,
    "max_rpm": 2600,
    "reference_speed_rpm": 1900,
    "limiting_speed_rpm": 2600,
    "weight_g": 14500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF 23226 (23226 CC/W33) is the spherical-roller choice for a 130 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 230×80 mm ISO 15 envelope. Digit by digit, 23226 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 32, and bore reference 26 resolving to 130 mm; 230 mm OD and 80 mm width are the matching ISO 15 boundary values. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Speed planning uses two different ceilings: 1,900 r/min thermal reference and 2,600 r/min mechanical limiting speed. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 23226 CCK/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.",
    "applications": [
      "large mining crusher main shafts",
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "At 130 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23200-series series at 130 mm bore (230×80 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 80 mm width changes abutment spacing, even though the 230 mm OD matches.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23226 pits long before its L10 life.",
      "The 14500 g mass and 80 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23226.",
      "The 826/1060 kN ratings are SKF catalogue values for this exact execution (23226 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23226 (cylindrical bore as listed, tapered-bore 23226 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23226 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23226?",
        "a": "The 23226 CC/W33 is a double-row spherical roller bearing with 130 mm bore, 230 mm outer diameter and 80 mm width (5.118 × 9.055 × 3.15 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 826 kN, C0 1060 kN, fatigue load limit Pu 104 kN, reference speed 1,900 r/min, limiting speed 2,600 r/min, mass about 14500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23226 bore code work?",
        "a": "The last two digits of 23226 are bore code 26, so 26 × 5 = 130 mm bore. The 230 mm OD and 80 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23226?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23226 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23226K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23226 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23226",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23226-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on AHX3226 withdrawal sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23226",
      "23226 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23228",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23228 CC/W33",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 250,
    "B_mm": 88,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 962,
    "static_load_kN": 1250,
    "fatigue_load_limit_kN": 120,
    "max_rpm": 2400,
    "reference_speed_rpm": 1700,
    "limiting_speed_rpm": 2400,
    "weight_g": 19000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23228 is a double-row spherical roller bearing in the 23200-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. On the SKF nameplate, 23228 follows the ISO 15 convention: 2 for the spherical roller type, 32 for the dimension series 32 (medium OD, extra wide), final digits 28 for the 140 mm bore. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. The 120 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.30 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 88 mm width across two roller rows needs the full charge.",
    "applications": [
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "smearing on the roller-raceway contact during skid starts below the minimum load"
    ],
    "pitfalls": [
      "At 140 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23200-series series at 140 mm bore (250×88 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 88 mm width changes abutment spacing, even though the 250 mm OD matches.",
      "Shaft and housing fillets must clear the bearing chamfer so the 88 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 962/1250 kN ratings are SKF catalogue values for this exact execution (23228 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23228 (cylindrical bore as listed, tapered-bore 23228 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23228 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23228?",
        "a": "The 23228 CC/W33 is a double-row spherical roller bearing with 140 mm bore, 250 mm outer diameter and 88 mm width (5.512 × 9.843 × 3.465 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 962 kN, C0 1250 kN, fatigue load limit Pu 120 kN, reference speed 1,700 r/min, limiting speed 2,400 r/min, mass about 19000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23228 bore code work?",
        "a": "The last two digits of 23228 are bore code 28, so 28 × 5 = 140 mm bore. The 250 mm OD and 88 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23228?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23228 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23228K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23228 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23228",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23228-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on AHX3228 withdrawal sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23228",
      "23228 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23230",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23230 CC/W33",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 270,
    "B_mm": 96,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1129,
    "static_load_kN": 1460,
    "fatigue_load_limit_kN": 137,
    "max_rpm": 2200,
    "reference_speed_rpm": 1600,
    "limiting_speed_rpm": 2200,
    "weight_g": 24500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 23230 appears as 23230 CC/W33: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 150×270×96 mm to the ISO 15 boundary plan. Numbering ties the bearing to its envelope: 23230 means spherical-roller type, dimension series 32, 150 mm bore — which is why the 270×96 mm outline swaps dimensionally with other ISO 15 bearings of the same code. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Catalogue mass 24500 g for the 150×270×96 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 23230 CCK/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.",
    "applications": [
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals"
    ],
    "pitfalls": [
      "At 150 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23200-series series at 150 mm bore (270×96 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 96 mm width changes abutment spacing, even though the 270 mm OD matches.",
      "The 24500 g mass and 96 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23230.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 1129/1460 kN ratings are SKF catalogue values for this exact execution (23230 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23230 (cylindrical bore as listed, tapered-bore 23230 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23230 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23230?",
        "a": "The 23230 CC/W33 is a double-row spherical roller bearing with 150 mm bore, 270 mm outer diameter and 96 mm width (5.906 × 10.63 × 3.78 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1129 kN, C0 1460 kN, fatigue load limit Pu 137 kN, reference speed 1,600 r/min, limiting speed 2,200 r/min, mass about 24500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23230 bore code work?",
        "a": "The last two digits of 23230 are bore code 30, so 30 × 5 = 150 mm bore. The 270 mm OD and 96 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23230?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23230 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23230K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23230 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23230",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23230-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H2330 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23230",
      "23230 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23232",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23232 CC/W33",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 104,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1281,
    "static_load_kN": 1660,
    "fatigue_load_limit_kN": 153,
    "max_rpm": 2200,
    "reference_speed_rpm": 1500,
    "limiting_speed_rpm": 2200,
    "weight_g": 31000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 160 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 23232 under catalogue execution 23232 CC/W33: two barrel-roller rows on a sphered outer raceway. The code breaks down as type digit 2 (double-row spherical roller), dimension series 32 (dimension series 32 (medium OD, extra wide)), and bore code 32 = 160 mm; dimensions 160×290×104 mm therefore match the ISO 15 envelope. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Speed planning uses two different ceilings: 1,500 r/min thermal reference and 2,200 r/min mechanical limiting speed. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 104 mm width across two roller rows needs the full charge.",
    "applications": [
      "large mining crusher main shafts",
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "At 160 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23200-series series at 160 mm bore (290×104 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 104 mm width changes abutment spacing, even though the 290 mm OD matches.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23232 pits long before its L10 life.",
      "The 1281/1660 kN ratings are SKF catalogue values for this exact execution (23232 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23232 (cylindrical bore as listed, tapered-bore 23232 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23232 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23232?",
        "a": "The 23232 CC/W33 is a double-row spherical roller bearing with 160 mm bore, 290 mm outer diameter and 104 mm width (6.299 × 11.417 × 4.094 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1281 kN, C0 1660 kN, fatigue load limit Pu 153 kN, reference speed 1,500 r/min, limiting speed 2,200 r/min, mass about 31000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23232 bore code work?",
        "a": "The last two digits of 23232 are bore code 32, so 32 × 5 = 160 mm bore. The 290 mm OD and 104 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23232?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23232 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23232K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23232 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23232",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23232-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H2332 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C3232",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 3232 shares the 160×290×104 mm envelope but catalogue C/C0 differ (1370/1830 kN vs 1281/1660 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C3232-K",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 3232 K shares the 160×290×104 mm envelope but catalogue C/C0 differ (1370/1830 kN vs 1281/1660 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23232",
      "23232 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23234",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23234 CC/W33",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 110,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1472,
    "static_load_kN": 1930,
    "fatigue_load_limit_kN": 173,
    "max_rpm": 2000,
    "reference_speed_rpm": 1400,
    "limiting_speed_rpm": 2000,
    "weight_g": 37500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number 23234 CC/W33 in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 170 mm shaft, dimension series 32 (medium OD, extra wide), with open execution and two pressed-steel cages with a floating guide ring. Digit by digit, 23234 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 32, and bore reference 34 resolving to 170 mm; 310 mm OD and 110 mm width are the matching ISO 15 boundary values. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. The 173 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.31 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 170 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.",
    "applications": [
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals"
    ],
    "pitfalls": [
      "At 170 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23200-series series at 170 mm bore (310×110 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 110 mm width changes abutment spacing, even though the 310 mm OD matches.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23234 pits long before its L10 life.",
      "Shaft and housing fillets must clear the bearing chamfer so the 110 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 1472/1930 kN ratings are SKF catalogue values for this exact execution (23234 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23234 (cylindrical bore as listed, tapered-bore 23234 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23234 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23234?",
        "a": "The 23234 CC/W33 is a double-row spherical roller bearing with 170 mm bore, 310 mm outer diameter and 110 mm width (6.693 × 12.205 × 4.331 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1472 kN, C0 1930 kN, fatigue load limit Pu 173 kN, reference speed 1,400 r/min, limiting speed 2,000 r/min, mass about 37500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23234 bore code work?",
        "a": "The last two digits of 23234 are bore code 34, so 34 × 5 = 170 mm bore. The 310 mm OD and 110 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23234?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23234 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23234K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23234 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23234",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23234-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H2334 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23234",
      "23234 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23236",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23236 CC/W33",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 112,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1557,
    "static_load_kN": 2120,
    "fatigue_load_limit_kN": 186,
    "max_rpm": 1900,
    "reference_speed_rpm": 1300,
    "limiting_speed_rpm": 1900,
    "weight_g": 39500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23236 CC/W33 is a 180×320×112 mm spherical roller bearing — the dimension series 32 (medium OD, extra wide) entry for a 180 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. On the SKF nameplate, 23236 follows the ISO 15 convention: 2 for the spherical roller type, 32 for the dimension series 32 (medium OD, extra wide), final digits 36 for the 180 mm bore. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. The 70.0 mm radial section height ((320−180)/2) and 39500 g catalogue mass frame a 180 mm bore bearing rated at 1557 kN C — roughly 8.65 kN of dynamic capacity per millimetre of bore before application factors. After mounting, swing the outer ring to confirm free self-alignment: the 23236 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.",
    "applications": [
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "At 180 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23200-series series at 180 mm bore (320×112 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 112 mm width changes abutment spacing, even though the 320 mm OD matches.",
      "Shaft and housing fillets must clear the bearing chamfer so the 112 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23236; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 1557/2120 kN ratings are SKF catalogue values for this exact execution (23236 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23236 (cylindrical bore as listed, tapered-bore 23236 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23236 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23236?",
        "a": "The 23236 CC/W33 is a double-row spherical roller bearing with 180 mm bore, 320 mm outer diameter and 112 mm width (7.087 × 12.598 × 4.409 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1557 kN, C0 2120 kN, fatigue load limit Pu 186 kN, reference speed 1,300 r/min, limiting speed 1,900 r/min, mass about 39500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23236 bore code work?",
        "a": "The last two digits of 23236 are bore code 36, so 36 × 5 = 180 mm bore. The 320 mm OD and 112 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23236?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23236 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23236K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23236 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23236",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23236-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H2336 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C3236",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3236 shares the 180×320×112 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C3236-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3236 K shares the 180×320×112 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23236",
      "23236 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23238",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23238 CC/W33",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 120,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1759,
    "static_load_kN": 2400,
    "fatigue_load_limit_kN": 208,
    "max_rpm": 1800,
    "reference_speed_rpm": 1300,
    "limiting_speed_rpm": 1800,
    "weight_g": 48000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23238 CC/W33 belongs to the SKF spherical roller range — the 190 mm bore entry in the 23200-series series (dimension series 32 (medium OD, extra wide)), dimensioned 340 mm OD and 120 mm wide. Reading the designation: the leading 2 marks a spherical roller bearing, the 32 is the ISO 15 dimension series (dimension series 32 (medium OD, extra wide)), and the last two digits encode the 190 mm bore; the 340 mm OD and 120 mm width follow the ISO 15 general plan. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. At 1,300 r/min reference speed the 75.0 mm-section 23238 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 1,800 r/min as the mechanical ceiling. Mount with the spherical bearing's self-alignment in mind: it compensates ≈ 0.5–2.5° of misalignment depending on series, but the shaft and housing seats still set the datum — a rotating inner ring on a 190 mm shaft typically takes a m6 seat with an H7 housing bore.",
    "applications": [
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "wind-turbine main shaft support"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals"
    ],
    "pitfalls": [
      "At 190 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23200-series series at 190 mm bore (340×120 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 120 mm width changes abutment spacing, even though the 340 mm OD matches.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23238; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "Catalogue reference speed and limiting speed are different limits: the 1,300 r/min reference is a thermal criterion under load, while the 1,800 r/min limiting value is the mechanical ceiling — observe both.",
      "The 1759/2400 kN ratings are SKF catalogue values for this exact execution (23238 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23238 (cylindrical bore as listed, tapered-bore 23238 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23238 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23238?",
        "a": "The 23238 CC/W33 is a double-row spherical roller bearing with 190 mm bore, 340 mm outer diameter and 120 mm width (7.48 × 13.386 × 4.724 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1759 kN, C0 2400 kN, fatigue load limit Pu 208 kN, reference speed 1,300 r/min, limiting speed 1,800 r/min, mass about 48000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23238 bore code work?",
        "a": "The last two digits of 23238 are bore code 38, so 38 × 5 = 190 mm bore. The 340 mm OD and 120 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23238?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23238 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23238K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23238 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23238",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23238-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H2338 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23238",
      "23238 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23240",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23240 CC/W33",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 200,
    "D_mm": 360,
    "B_mm": 128,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1947,
    "static_load_kN": 2700,
    "fatigue_load_limit_kN": 228,
    "max_rpm": 1700,
    "reference_speed_rpm": 1200,
    "limiting_speed_rpm": 1700,
    "weight_g": 58000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF 23240 (23240 CC/W33) is the spherical-roller choice for a 200 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 360×128 mm ISO 15 envelope. The code breaks down as type digit 2 (double-row spherical roller), dimension series 32 (dimension series 32 (medium OD, extra wide)), and bore code 40 = 200 mm; dimensions 200×360×128 mm therefore match the ISO 15 envelope. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. The 228 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.39 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. After mounting, swing the outer ring to confirm free self-alignment: the 23240 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.",
    "applications": [
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "At 200 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23200-series series at 200 mm bore (360×128 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 128 mm width changes abutment spacing, even though the 360 mm OD matches.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "Catalogue reference speed and limiting speed are different limits: the 1,200 r/min reference is a thermal criterion under load, while the 1,700 r/min limiting value is the mechanical ceiling — observe both.",
      "The 1947/2700 kN ratings are SKF catalogue values for this exact execution (23240 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23240 (cylindrical bore as listed, tapered-bore 23240 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23240 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23240?",
        "a": "The 23240 CC/W33 is a double-row spherical roller bearing with 200 mm bore, 360 mm outer diameter and 128 mm width (7.874 × 14.173 × 5.039 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1947 kN, C0 2700 kN, fatigue load limit Pu 228 kN, reference speed 1,200 r/min, limiting speed 1,700 r/min, mass about 58000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23240 bore code work?",
        "a": "The last two digits of 23240 are bore code 40, so 40 × 5 = 200 mm bore. The 360 mm OD and 128 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23240?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23240 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23240K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23240 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23240",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23240-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on AH3240 withdrawal sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23240",
      "23240 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23244",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23244 CC/W33",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 220,
    "D_mm": 400,
    "B_mm": 144,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 2485,
    "static_load_kN": 3450,
    "fatigue_load_limit_kN": 285,
    "max_rpm": 1500,
    "reference_speed_rpm": 1100,
    "limiting_speed_rpm": 1500,
    "weight_g": 81500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 23244 appears as 23244 CC/W33: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 220×400×144 mm to the ISO 15 boundary plan. On the SKF nameplate, 23244 follows the ISO 15 convention: 2 for the spherical roller type, 32 for the dimension series 32 (medium OD, extra wide), final digits 44 for the 220 mm bore. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. At 1,100 r/min reference speed the 90.0 mm-section 23244 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 1,500 r/min as the mechanical ceiling. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.",
    "applications": [
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "wind-turbine main shaft support"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "At 220 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23200-series series at 220 mm bore (400×144 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 144 mm width changes abutment spacing, even though the 400 mm OD matches.",
      "Shaft and housing fillets must clear the bearing chamfer so the 144 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 81500 g mass and 144 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23244.",
      "The 2485/3450 kN ratings are SKF catalogue values for this exact execution (23244 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23244 (cylindrical bore as listed, tapered-bore 23244 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23244 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23244?",
        "a": "The 23244 CC/W33 is a double-row spherical roller bearing with 220 mm bore, 400 mm outer diameter and 144 mm width (8.661 × 15.748 × 5.669 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2485 kN, C0 3450 kN, fatigue load limit Pu 285 kN, reference speed 1,100 r/min, limiting speed 1,500 r/min, mass about 81500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23244 bore code work?",
        "a": "The last two digits of 23244 are bore code 44, so 44 × 5 = 220 mm bore. The 400 mm OD and 144 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23244?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23244 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23244K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23244 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23244",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23244-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on AOH2344 withdrawal sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23244",
      "23244 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23248",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23248 CC/W33",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 240,
    "D_mm": 440,
    "B_mm": 160,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 3042,
    "static_load_kN": 4300,
    "fatigue_load_limit_kN": 345,
    "max_rpm": 1300,
    "reference_speed_rpm": 950,
    "limiting_speed_rpm": 1300,
    "weight_g": 110000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number 23248 CC/W33 in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 240 mm shaft, dimension series 32 (medium OD, extra wide), with open execution and two pressed-steel cages with a floating guide ring. Numbering ties the bearing to its envelope: 23248 means spherical-roller type, dimension series 32, 240 mm bore — which is why the 440×160 mm outline swaps dimensionally with other ISO 15 bearings of the same code. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Selection arithmetic: the C0/C ratio is about 1.41 (static 4300 kN against dynamic 3042 kN), typical of a spherical roller sized for heavy combined loads, and the 345 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 23248 CCK/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.",
    "applications": [
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "At 240 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23200-series series at 240 mm bore (440×160 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 160 mm width changes abutment spacing, even though the 440 mm OD matches.",
      "Catalogue reference speed and limiting speed are different limits: the 950 r/min reference is a thermal criterion under load, while the 1,300 r/min limiting value is the mechanical ceiling — observe both.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23248 pits long before its L10 life.",
      "The 3042/4300 kN ratings are SKF catalogue values for this exact execution (23248 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23248 (cylindrical bore as listed, tapered-bore 23248 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23248 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23248?",
        "a": "The 23248 CC/W33 is a double-row spherical roller bearing with 240 mm bore, 440 mm outer diameter and 160 mm width (9.449 × 17.323 × 6.299 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 3042 kN, C0 4300 kN, fatigue load limit Pu 345 kN, reference speed 950 r/min, limiting speed 1,300 r/min, mass about 110000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23248 bore code work?",
        "a": "The last two digits of 23248 are bore code 48, so 48 × 5 = 240 mm bore. The 440 mm OD and 160 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23248?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23248 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23248K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23248 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23248",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23248-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on AOH2348 withdrawal sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23248",
      "23248 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23252",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23252 CC/W33",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 260,
    "D_mm": 480,
    "B_mm": 174,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 3395,
    "static_load_kN": 4750,
    "fatigue_load_limit_kN": 360,
    "max_rpm": 1200,
    "reference_speed_rpm": 850,
    "limiting_speed_rpm": 1200,
    "weight_g": 140000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23252 CC/W33 belongs to the SKF spherical roller range — the 260 mm bore entry in the 23200-series series (dimension series 32 (medium OD, extra wide)), dimensioned 480 mm OD and 174 mm wide. On the SKF nameplate, 23252 follows the ISO 15 convention: 2 for the spherical roller type, 32 for the dimension series 32 (medium OD, extra wide), final digits 52 for the 260 mm bore. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. With C 3395 kN and C0 4750 kN, the 23252 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 23252 CCK/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.",
    "applications": [
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals"
    ],
    "pitfalls": [
      "At 260 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23200-series series at 260 mm bore (480×174 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 174 mm width changes abutment spacing, even though the 480 mm OD matches.",
      "Shaft and housing fillets must clear the bearing chamfer so the 174 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "Shaft and housing fillets must clear the bearing chamfer so the 174 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 3395/4750 kN ratings are SKF catalogue values for this exact execution (23252 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23252 (cylindrical bore as listed, tapered-bore 23252 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23252 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23252?",
        "a": "The 23252 CC/W33 is a double-row spherical roller bearing with 260 mm bore, 480 mm outer diameter and 174 mm width (10.236 × 18.898 × 6.85 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 3395 kN, C0 4750 kN, fatigue load limit Pu 360 kN, reference speed 850 r/min, limiting speed 1,200 r/min, mass about 140000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23252 bore code work?",
        "a": "The last two digits of 23252 are bore code 52, so 52 × 5 = 260 mm bore. The 480 mm OD and 174 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23252?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23252 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23252K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23252 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23252",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23252-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on OH2352 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23252",
      "23252 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23256",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23256 CC/W33",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 280,
    "D_mm": 500,
    "B_mm": 176,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 3425,
    "static_load_kN": 4900,
    "fatigue_load_limit_kN": 365,
    "max_rpm": 1100,
    "reference_speed_rpm": 800,
    "limiting_speed_rpm": 1100,
    "weight_g": 150000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23256 is a double-row spherical roller bearing in the 23200-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. Numbering ties the bearing to its envelope: 23256 means spherical-roller type, dimension series 32, 280 mm bore — which is why the 500×176 mm outline swaps dimensionally with other ISO 15 bearings of the same code. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Catalogue mass 150000 g for the 280×500×176 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 280 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.",
    "applications": [
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals"
    ],
    "pitfalls": [
      "At 280 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23200-series series at 280 mm bore (500×176 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 176 mm width changes abutment spacing, even though the 500 mm OD matches.",
      "Catalogue reference speed and limiting speed are different limits: the 800 r/min reference is a thermal criterion under load, while the 1,100 r/min limiting value is the mechanical ceiling — observe both.",
      "Catalogue reference speed and limiting speed are different limits: the 800 r/min reference is a thermal criterion under load, while the 1,100 r/min limiting value is the mechanical ceiling — observe both.",
      "The 3425/4900 kN ratings are SKF catalogue values for this exact execution (23256 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23256 (cylindrical bore as listed, tapered-bore 23256 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23256 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23256?",
        "a": "The 23256 CC/W33 is a double-row spherical roller bearing with 280 mm bore, 500 mm outer diameter and 176 mm width (11.024 × 19.685 × 6.929 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 3425 kN, C0 4900 kN, fatigue load limit Pu 365 kN, reference speed 800 r/min, limiting speed 1,100 r/min, mass about 150000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23256 bore code work?",
        "a": "The last two digits of 23256 are bore code 56, so 56 × 5 = 280 mm bore. The 500 mm OD and 176 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23256?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23256 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23256K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23256 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23256",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23256-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on OH2356 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23256",
      "23256 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23260",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23260 CC/W33",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 300,
    "D_mm": 540,
    "B_mm": 192,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 4052,
    "static_load_kN": 5850,
    "fatigue_load_limit_kN": 425,
    "max_rpm": 1000,
    "reference_speed_rpm": 750,
    "limiting_speed_rpm": 1000,
    "weight_g": 190000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 300 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 23260 under catalogue execution 23260 CC/W33: two barrel-roller rows on a sphered outer raceway. On the SKF nameplate, 23260 follows the ISO 15 convention: 2 for the spherical roller type, 32 for the dimension series 32 (medium OD, extra wide), final digits 60 for the 300 mm bore. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Selection arithmetic: the C0/C ratio is about 1.44 (static 5850 kN against dynamic 4052 kN), typical of a spherical roller sized for heavy combined loads, and the 425 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 300 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.",
    "applications": [
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "smearing on the roller-raceway contact during skid starts below the minimum load"
    ],
    "pitfalls": [
      "At 300 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23200-series series at 300 mm bore (540×192 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 192 mm width changes abutment spacing, even though the 540 mm OD matches.",
      "Shaft and housing fillets must clear the bearing chamfer so the 192 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 23260 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 4052/5850 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 4052/5850 kN ratings are SKF catalogue values for this exact execution (23260 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23260 (cylindrical bore as listed, tapered-bore 23260 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23260 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23260?",
        "a": "The 23260 CC/W33 is a double-row spherical roller bearing with 300 mm bore, 540 mm outer diameter and 192 mm width (11.811 × 21.26 × 7.559 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 4052 kN, C0 5850 kN, fatigue load limit Pu 425 kN, reference speed 750 r/min, limiting speed 1,000 r/min, mass about 190000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23260 bore code work?",
        "a": "The last two digits of 23260 are bore code 60, so 60 × 5 = 300 mm bore. The 540 mm OD and 192 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23260?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23260 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23260K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23260 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23260",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23260-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on OH3260 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23260",
      "23260 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23264",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23264 CC/W33",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 320,
    "D_mm": 580,
    "B_mm": 208,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 4607,
    "static_load_kN": 6700,
    "fatigue_load_limit_kN": 475,
    "max_rpm": 950,
    "reference_speed_rpm": 700,
    "limiting_speed_rpm": 950,
    "weight_g": 240000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23264 CC/W33 is a 320×580×208 mm spherical roller bearing — the dimension series 32 (medium OD, extra wide) entry for a 320 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. Numbering ties the bearing to its envelope: 23264 means spherical-roller type, dimension series 32, 320 mm bore — which is why the 580×208 mm outline swaps dimensionally with other ISO 15 bearings of the same code. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Speed planning uses two different ceilings: 700 r/min thermal reference and 950 r/min mechanical limiting speed. Mount with the spherical bearing's self-alignment in mind: it compensates ≈ 0.5–2.5° of misalignment depending on series, but the shaft and housing seats still set the datum — a rotating inner ring on a 320 mm shaft typically takes a m6 seat with an H7 housing bore.",
    "applications": [
      "large mining crusher main shafts",
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "smearing on the roller-raceway contact during skid starts below the minimum load"
    ],
    "pitfalls": [
      "At 320 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23200-series series at 320 mm bore (580×208 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 208 mm width changes abutment spacing, even though the 580 mm OD matches.",
      "Catalogue reference speed and limiting speed are different limits: the 700 r/min reference is a thermal criterion under load, while the 950 r/min limiting value is the mechanical ceiling — observe both.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 4607/6700 kN ratings are SKF catalogue values for this exact execution (23264 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23264 (cylindrical bore as listed, tapered-bore 23264 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23264 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23264?",
        "a": "The 23264 CC/W33 is a double-row spherical roller bearing with 320 mm bore, 580 mm outer diameter and 208 mm width (12.598 × 22.835 × 8.189 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 4607 kN, C0 6700 kN, fatigue load limit Pu 475 kN, reference speed 700 r/min, limiting speed 950 r/min, mass about 240000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23264 bore code work?",
        "a": "The last two digits of 23264 are bore code 64, so 64 × 5 = 320 mm bore. The 580 mm OD and 208 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23264?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23264 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23264K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23264 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23264",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23264-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on OH3264 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23264",
      "23264 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23268",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23268 CA/W33",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 340,
    "D_mm": 620,
    "B_mm": 224,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 5362,
    "static_load_kN": 7800,
    "fatigue_load_limit_kN": 550,
    "max_rpm": 800,
    "reference_speed_rpm": 560,
    "limiting_speed_rpm": 800,
    "weight_g": 295000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF 23268 (23268 CA/W33) is the spherical-roller choice for a 340 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 620×224 mm ISO 15 envelope. Digit by digit, 23268 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 32, and bore reference 68 resolving to 340 mm; 620 mm OD and 224 mm width are the matching ISO 15 boundary values. In SKF suffix language, CA/W33 means the brass-cage CA execution — often preferred for the largest bores and for shock/vibration duty where a rigid machined cage matters; W33 adds the relubrication groove. The sealed 2CS5 and vibrating-screen VA405 are separate executions. The 140.0 mm radial section height ((620−340)/2) and 295000 g catalogue mass frame a 340 mm bore bearing rated at 5362 kN C — roughly 15.77 kN of dynamic capacity per millimetre of bore before application factors. A 340 mm rotating inner ring usually runs m6 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.",
    "applications": [
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "smearing on the roller-raceway contact during skid starts below the minimum load"
    ],
    "pitfalls": [
      "At 340 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23200-series series at 340 mm bore (620×224 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 224 mm width changes abutment spacing, even though the 620 mm OD matches.",
      "The 295000 g mass and 224 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23268.",
      "Shaft and housing fillets must clear the bearing chamfer so the 224 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 5362/7800 kN ratings are SKF catalogue values for this exact execution (23268 CA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23268 (cylindrical bore as listed, tapered-bore 23268 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23268 CA/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23268?",
        "a": "The 23268 CA/W33 is a double-row spherical roller bearing with 340 mm bore, 620 mm outer diameter and 224 mm width (13.386 × 24.409 × 8.819 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 5362 kN, C0 7800 kN, fatigue load limit Pu 550 kN, reference speed 560 r/min, limiting speed 800 r/min, mass about 295000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)."
      },
      {
        "q": "How does the 23268 bore code work?",
        "a": "The last two digits of 23268 are bore code 68, so 68 × 5 = 340 mm bore. The 620 mm OD and 224 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CA/W33 suffix mean on 23268?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23268 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23268K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23268 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23268",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23268-CAK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on OH3268 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23268",
      "23268 CA/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23272",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23272 CA/W33",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 360,
    "D_mm": 650,
    "B_mm": 232,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 5663,
    "static_load_kN": 8300,
    "fatigue_load_limit_kN": 570,
    "max_rpm": 750,
    "reference_speed_rpm": 530,
    "limiting_speed_rpm": 750,
    "weight_g": 335000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 23272 appears as 23272 CA/W33: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 360×650×232 mm to the ISO 15 boundary plan. Numbering ties the bearing to its envelope: 23272 means spherical-roller type, dimension series 32, 360 mm bore — which is why the 650×232 mm outline swaps dimensionally with other ISO 15 bearings of the same code. In SKF suffix language, CA/W33 means the brass-cage CA execution — often preferred for the largest bores and for shock/vibration duty where a rigid machined cage matters; W33 adds the relubrication groove. The sealed 2CS5 and vibrating-screen VA405 are separate executions. The 570 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.47 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. A 360 mm rotating inner ring usually runs m6 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.",
    "applications": [
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "At 360 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23200-series series at 360 mm bore (650×232 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 232 mm width changes abutment spacing, even though the 650 mm OD matches.",
      "Catalogue reference speed and limiting speed are different limits: the 530 r/min reference is a thermal criterion under load, while the 750 r/min limiting value is the mechanical ceiling — observe both.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23272; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 5663/8300 kN ratings are SKF catalogue values for this exact execution (23272 CA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23272 (cylindrical bore as listed, tapered-bore 23272 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23272 CA/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23272?",
        "a": "The 23272 CA/W33 is a double-row spherical roller bearing with 360 mm bore, 650 mm outer diameter and 232 mm width (14.173 × 25.591 × 9.134 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 5663 kN, C0 8300 kN, fatigue load limit Pu 570 kN, reference speed 530 r/min, limiting speed 750 r/min, mass about 335000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)."
      },
      {
        "q": "How does the 23272 bore code work?",
        "a": "The last two digits of 23272 are bore code 72, so 72 × 5 = 360 mm bore. The 650 mm OD and 232 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CA/W33 suffix mean on 23272?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23272 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23272K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23272 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23272",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23272-CAK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on OH3272 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23272",
      "23272 CA/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23276",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23276 CA/W33",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 380,
    "D_mm": 680,
    "B_mm": 240,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 6126,
    "static_load_kN": 9150,
    "fatigue_load_limit_kN": 620,
    "max_rpm": 750,
    "reference_speed_rpm": 500,
    "limiting_speed_rpm": 750,
    "weight_g": 375000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number 23276 CA/W33 in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 380 mm shaft, dimension series 32 (medium OD, extra wide), with open execution and a one-piece machined brass cage guided on the inner ring (CA design). Digit by digit, 23276 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 32, and bore reference 76 resolving to 380 mm; 680 mm OD and 240 mm width are the matching ISO 15 boundary values. In SKF suffix language, CA/W33 means the brass-cage CA execution — often preferred for the largest bores and for shock/vibration duty where a rigid machined cage matters; W33 adds the relubrication groove. The sealed 2CS5 and vibrating-screen VA405 are separate executions. At 500 r/min reference speed the 150.0 mm-section 23276 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 750 r/min as the mechanical ceiling. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 240 mm width across two roller rows needs the full charge.",
    "applications": [
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "wind-turbine main shaft support"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "At 380 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23200-series series at 380 mm bore (680×240 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 240 mm width changes abutment spacing, even though the 680 mm OD matches.",
      "The 375000 g mass and 240 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23276.",
      "The 23276 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 6126/9150 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 6126/9150 kN ratings are SKF catalogue values for this exact execution (23276 CA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23276 (cylindrical bore as listed, tapered-bore 23276 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23276 CA/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23276?",
        "a": "The 23276 CA/W33 is a double-row spherical roller bearing with 380 mm bore, 680 mm outer diameter and 240 mm width (14.961 × 26.772 × 9.449 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 6126 kN, C0 9150 kN, fatigue load limit Pu 620 kN, reference speed 500 r/min, limiting speed 750 r/min, mass about 375000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)."
      },
      {
        "q": "How does the 23276 bore code work?",
        "a": "The last two digits of 23276 are bore code 76, so 76 × 5 = 380 mm bore. The 680 mm OD and 240 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CA/W33 suffix mean on 23276?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23276 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23276K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23276 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23276",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23276-CAK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on OH3276 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23276",
      "23276 CA/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23280",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23280 CA/W33",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 400,
    "D_mm": 720,
    "B_mm": 256,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 6881,
    "static_load_kN": 10400,
    "fatigue_load_limit_kN": 680,
    "max_rpm": 670,
    "reference_speed_rpm": 480,
    "limiting_speed_rpm": 670,
    "weight_g": 450000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23280 CA/W33 belongs to the SKF spherical roller range — the 400 mm bore entry in the 23200-series series (dimension series 32 (medium OD, extra wide)), dimensioned 720 mm OD and 256 mm wide. Numbering ties the bearing to its envelope: 23280 means spherical-roller type, dimension series 32, 400 mm bore — which is why the 720×256 mm outline swaps dimensionally with other ISO 15 bearings of the same code. In SKF suffix language, CA/W33 means the brass-cage CA execution — often preferred for the largest bores and for shock/vibration duty where a rigid machined cage matters; W33 adds the relubrication groove. The sealed 2CS5 and vibrating-screen VA405 are separate executions. The 160.0 mm radial section height ((720−400)/2) and 450000 g catalogue mass frame a 400 mm bore bearing rated at 6881 kN C — roughly 17.20 kN of dynamic capacity per millimetre of bore before application factors. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 256 mm width across two roller rows needs the full charge.",
    "applications": [
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "At 400 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23200-series series at 400 mm bore (720×256 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 256 mm width changes abutment spacing, even though the 720 mm OD matches.",
      "Catalogue reference speed and limiting speed are different limits: the 480 r/min reference is a thermal criterion under load, while the 670 r/min limiting value is the mechanical ceiling — observe both.",
      "The 450000 g mass and 256 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23280.",
      "The 6881/10400 kN ratings are SKF catalogue values for this exact execution (23280 CA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23280 (cylindrical bore as listed, tapered-bore 23280 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23280 CA/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23280?",
        "a": "The 23280 CA/W33 is a double-row spherical roller bearing with 400 mm bore, 720 mm outer diameter and 256 mm width (15.748 × 28.346 × 10.079 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 6881 kN, C0 10400 kN, fatigue load limit Pu 680 kN, reference speed 480 r/min, limiting speed 670 r/min, mass about 450000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)."
      },
      {
        "q": "How does the 23280 bore code work?",
        "a": "The last two digits of 23280 are bore code 80, so 80 × 5 = 400 mm bore. The 720 mm OD and 256 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CA/W33 suffix mean on 23280?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23280 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23280K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23280 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23280",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23280-CAK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on OH3280 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23280",
      "23280 CA/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23284",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23284 CA/W33",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 420,
    "D_mm": 760,
    "B_mm": 272,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 7677,
    "static_load_kN": 11600,
    "fatigue_load_limit_kN": 765,
    "max_rpm": 630,
    "reference_speed_rpm": 450,
    "limiting_speed_rpm": 630,
    "weight_g": 535000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23284 is a double-row spherical roller bearing in the 23200-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. Digit by digit, 23284 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 32, and bore reference 84 resolving to 420 mm; 760 mm OD and 272 mm width are the matching ISO 15 boundary values. In SKF suffix language, CA/W33 means the brass-cage CA execution — often preferred for the largest bores and for shock/vibration duty where a rigid machined cage matters; W33 adds the relubrication groove. The sealed 2CS5 and vibrating-screen VA405 are separate executions. With C 7677 kN and C0 11600 kN, the 23284 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. After mounting, swing the outer ring to confirm free self-alignment: the 23284 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.",
    "applications": [
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "At 420 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23200-series series at 420 mm bore (760×272 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 272 mm width changes abutment spacing, even though the 760 mm OD matches.",
      "The 535000 g mass and 272 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23284.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23284 pits long before its L10 life.",
      "The 7677/11600 kN ratings are SKF catalogue values for this exact execution (23284 CA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23284 (cylindrical bore as listed, tapered-bore 23284 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23284 CA/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23284?",
        "a": "The 23284 CA/W33 is a double-row spherical roller bearing with 420 mm bore, 760 mm outer diameter and 272 mm width (16.535 × 29.921 × 10.709 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 7677 kN, C0 11600 kN, fatigue load limit Pu 765 kN, reference speed 450 r/min, limiting speed 630 r/min, mass about 535000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)."
      },
      {
        "q": "How does the 23284 bore code work?",
        "a": "The last two digits of 23284 are bore code 84, so 84 × 5 = 420 mm bore. The 760 mm OD and 272 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CA/W33 suffix mean on 23284?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23284 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23284K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23284 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23284",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23284-CAK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on OH3284 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23284",
      "23284 CA/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23288",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23288 CA/W33",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 440,
    "D_mm": 790,
    "B_mm": 280,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 8150,
    "static_load_kN": 12500,
    "fatigue_load_limit_kN": 800,
    "max_rpm": 600,
    "reference_speed_rpm": 430,
    "limiting_speed_rpm": 600,
    "weight_g": 590000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 440 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 23288 under catalogue execution 23288 CA/W33: two barrel-roller rows on a sphered outer raceway. Reading the designation: the leading 2 marks a spherical roller bearing, the 32 is the ISO 15 dimension series (dimension series 32 (medium OD, extra wide)), and the last two digits encode the 440 mm bore; the 790 mm OD and 280 mm width follow the ISO 15 general plan. In SKF suffix language, CA/W33 means the brass-cage CA execution — often preferred for the largest bores and for shock/vibration duty where a rigid machined cage matters; W33 adds the relubrication groove. The sealed 2CS5 and vibrating-screen VA405 are separate executions. Catalogue mass 590000 g for the 440×790×280 mm open execution covers the a one-piece machined brass cage guided on the inner ring (CA design); tapered-bore and sealed variants differ in mass and carry their own order numbers. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.",
    "applications": [
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "At 440 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23200-series series at 440 mm bore (790×280 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 280 mm width changes abutment spacing, even though the 790 mm OD matches.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23288 pits long before its L10 life.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23288; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 8150/12500 kN ratings are SKF catalogue values for this exact execution (23288 CA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23288 (cylindrical bore as listed, tapered-bore 23288 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23288 CA/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23288?",
        "a": "The 23288 CA/W33 is a double-row spherical roller bearing with 440 mm bore, 790 mm outer diameter and 280 mm width (17.323 × 31.102 × 11.024 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 8150 kN, C0 12500 kN, fatigue load limit Pu 800 kN, reference speed 430 r/min, limiting speed 600 r/min, mass about 590000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)."
      },
      {
        "q": "How does the 23288 bore code work?",
        "a": "The last two digits of 23288 are bore code 88, so 88 × 5 = 440 mm bore. The 790 mm OD and 280 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CA/W33 suffix mean on 23288?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23288 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23288K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23288 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23288",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23288-CAK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on OH3288 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23288",
      "23288 CA/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23292",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23292 CA/W33",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 460,
    "D_mm": 830,
    "B_mm": 296,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 8958,
    "static_load_kN": 13700,
    "fatigue_load_limit_kN": 880,
    "max_rpm": 560,
    "reference_speed_rpm": 400,
    "limiting_speed_rpm": 560,
    "weight_g": 695000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23292 CA/W33 is a 460×830×296 mm spherical roller bearing — the dimension series 32 (medium OD, extra wide) entry for a 460 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. Digit by digit, 23292 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 32, and bore reference 92 resolving to 460 mm; 830 mm OD and 296 mm width are the matching ISO 15 boundary values. In SKF suffix language, CA/W33 means the brass-cage CA execution — often preferred for the largest bores and for shock/vibration duty where a rigid machined cage matters; W33 adds the relubrication groove. The sealed 2CS5 and vibrating-screen VA405 are separate executions. Selection arithmetic: the C0/C ratio is about 1.53 (static 13700 kN against dynamic 8958 kN), typical of a spherical roller sized for heavy combined loads, and the 880 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.",
    "applications": [
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals"
    ],
    "pitfalls": [
      "At 460 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23200-series series at 460 mm bore (830×296 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 296 mm width changes abutment spacing, even though the 830 mm OD matches.",
      "The 695000 g mass and 296 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23292.",
      "Catalogue reference speed and limiting speed are different limits: the 400 r/min reference is a thermal criterion under load, while the 560 r/min limiting value is the mechanical ceiling — observe both.",
      "The 8958/13700 kN ratings are SKF catalogue values for this exact execution (23292 CA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23292 (cylindrical bore as listed, tapered-bore 23292 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23292 CA/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23292?",
        "a": "The 23292 CA/W33 is a double-row spherical roller bearing with 460 mm bore, 830 mm outer diameter and 296 mm width (18.11 × 32.677 × 11.654 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 8958 kN, C0 13700 kN, fatigue load limit Pu 880 kN, reference speed 400 r/min, limiting speed 560 r/min, mass about 695000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)."
      },
      {
        "q": "How does the 23292 bore code work?",
        "a": "The last two digits of 23292 are bore code 92, so 92 × 5 = 460 mm bore. The 830 mm OD and 296 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CA/W33 suffix mean on 23292?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23292 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23292K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23292 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23292",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23292-CAK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on AOHX3292 withdrawal sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C3292-MB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3292 MB shares the 460×830×296 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C3292-KMB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3292 KMB shares the 460×830×296 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23292",
      "23292 CA/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23296",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23296 CA/W33",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 480,
    "D_mm": 870,
    "B_mm": 310,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 9805,
    "static_load_kN": 15000,
    "fatigue_load_limit_kN": 950,
    "max_rpm": 530,
    "reference_speed_rpm": 380,
    "limiting_speed_rpm": 530,
    "weight_g": 800000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF 23296 (23296 CA/W33) is the spherical-roller choice for a 480 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 870×310 mm ISO 15 envelope. Reading the designation: the leading 2 marks a spherical roller bearing, the 32 is the ISO 15 dimension series (dimension series 32 (medium OD, extra wide)), and the last two digits encode the 480 mm bore; the 870 mm OD and 310 mm width follow the ISO 15 general plan. In SKF suffix language, CA/W33 means the brass-cage CA execution — often preferred for the largest bores and for shock/vibration duty where a rigid machined cage matters; W33 adds the relubrication groove. The sealed 2CS5 and vibrating-screen VA405 are separate executions. Speed planning uses two different ceilings: 380 r/min thermal reference and 530 r/min mechanical limiting speed. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 23296 CCK/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.",
    "applications": [
      "large mining crusher main shafts",
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals"
    ],
    "pitfalls": [
      "At 480 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23200-series series at 480 mm bore (870×310 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 310 mm width changes abutment spacing, even though the 870 mm OD matches.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23296 pits long before its L10 life.",
      "The 800000 g mass and 310 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23296.",
      "The 9805/15000 kN ratings are SKF catalogue values for this exact execution (23296 CA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23296 (cylindrical bore as listed, tapered-bore 23296 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23296 CA/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23296?",
        "a": "The 23296 CA/W33 is a double-row spherical roller bearing with 480 mm bore, 870 mm outer diameter and 310 mm width (18.898 × 34.252 × 12.205 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 9805 kN, C0 15000 kN, fatigue load limit Pu 950 kN, reference speed 380 r/min, limiting speed 530 r/min, mass about 800000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)."
      },
      {
        "q": "How does the 23296 bore code work?",
        "a": "The last two digits of 23296 are bore code 96, so 96 × 5 = 480 mm bore. The 870 mm OD and 310 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CA/W33 suffix mean on 23296?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23296 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23296K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23296 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23296",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23296-CAK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on AOHX3296 withdrawal sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23296",
      "23296 CA/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23936",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23936 CC/W33",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 250,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 519,
    "static_load_kN": 830,
    "fatigue_load_limit_kN": 76.5,
    "max_rpm": 2800,
    "reference_speed_rpm": 2600,
    "limiting_speed_rpm": 2800,
    "weight_g": 7900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23936 CC/W33 belongs to the SKF spherical roller range — the 180 mm bore entry in the 23900-series series (dimension series 39 (compact OD, narrow)), dimensioned 250 mm OD and 52 mm wide. The code breaks down as type digit 2 (double-row spherical roller), dimension series 39 (dimension series 39 (compact OD, narrow)), and bore code 36 = 180 mm; dimensions 180×250×52 mm therefore match the ISO 15 envelope. The suffix chain reads CC (two pressed-steel cages with a floating guide ring between the roller rows) plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK/W33 is the 1:12 tapered-bore counterpart. The 76.5 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.60 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 52 mm width across two roller rows needs the full charge.",
    "applications": [
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "At 180 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23900-series series at 180 mm bore (250×52 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The 7900 g mass and 52 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23936.",
      "The 7900 g mass and 52 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23936.",
      "The 519/830 kN ratings are SKF catalogue values for this exact execution (23936 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23936 (cylindrical bore as listed, tapered-bore 23936 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23936 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23936?",
        "a": "The 23936 CC/W33 is a double-row spherical roller bearing with 180 mm bore, 250 mm outer diameter and 52 mm width (7.087 × 9.843 × 2.047 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 519 kN, C0 830 kN, fatigue load limit Pu 76.5 kN, reference speed 2,600 r/min, limiting speed 2,800 r/min, mass about 7900 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23936 bore code work?",
        "a": "The last two digits of 23936 are bore code 36, so 36 × 5 = 180 mm bore. The 250 mm OD and 52 mm width come from the ISO 15 dimension-series plan (dimension series 39 (compact OD, narrow)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23936?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23936 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23936K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23936 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23936",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23936-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H3936 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23936",
      "23936 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23938",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23938 CC/W33",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 190,
    "D_mm": 260,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 499,
    "static_load_kN": 800,
    "fatigue_load_limit_kN": 76.5,
    "max_rpm": 2600,
    "reference_speed_rpm": 2400,
    "limiting_speed_rpm": 2600,
    "weight_g": 8300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF 23938 (23938 CC/W33) is the spherical-roller choice for a 190 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 260×52 mm ISO 15 envelope. Digit by digit, 23938 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 39, and bore reference 38 resolving to 190 mm; 260 mm OD and 52 mm width are the matching ISO 15 boundary values. The suffix chain reads CC (two pressed-steel cages with a floating guide ring between the roller rows) plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK/W33 is the 1:12 tapered-bore counterpart. The 35.0 mm radial section height ((260−190)/2) and 8300 g catalogue mass frame a 190 mm bore bearing rated at 499 kN C — roughly 2.63 kN of dynamic capacity per millimetre of bore before application factors. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 190 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.",
    "applications": [
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "smearing on the roller-raceway contact during skid starts below the minimum load"
    ],
    "pitfalls": [
      "At 190 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23900-series series at 190 mm bore (260×52 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 499/800 kN ratings are SKF catalogue values for this exact execution (23938 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23938 (cylindrical bore as listed, tapered-bore 23938 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23938 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23938?",
        "a": "The 23938 CC/W33 is a double-row spherical roller bearing with 190 mm bore, 260 mm outer diameter and 52 mm width (7.48 × 10.236 × 2.047 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 499 kN, C0 800 kN, fatigue load limit Pu 76.5 kN, reference speed 2,400 r/min, limiting speed 2,600 r/min, mass about 8300 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23938 bore code work?",
        "a": "The last two digits of 23938 are bore code 38, so 38 × 5 = 190 mm bore. The 260 mm OD and 52 mm width come from the ISO 15 dimension-series plan (dimension series 39 (compact OD, narrow)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23938?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23938 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23938K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23938 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23938",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23938-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H3938 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23938",
      "23938 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23940",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23940 CC/W33",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 200,
    "D_mm": 280,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 651,
    "static_load_kN": 1040,
    "fatigue_load_limit_kN": 93,
    "max_rpm": 2400,
    "reference_speed_rpm": 2200,
    "limiting_speed_rpm": 2400,
    "weight_g": 11500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23940 is a double-row spherical roller bearing in the 23900-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. Reading the designation: the leading 2 marks a spherical roller bearing, the 39 is the ISO 15 dimension series (dimension series 39 (compact OD, narrow)), and the last two digits encode the 200 mm bore; the 280 mm OD and 60 mm width follow the ISO 15 general plan. The suffix chain reads CC (two pressed-steel cages with a floating guide ring between the roller rows) plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK/W33 is the 1:12 tapered-bore counterpart. Speed planning uses two different ceilings: 2,200 r/min thermal reference and 2,400 r/min mechanical limiting speed. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 60 mm width across two roller rows needs the full charge.",
    "applications": [
      "large mining crusher main shafts",
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals"
    ],
    "pitfalls": [
      "At 200 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23900-series series at 200 mm bore (280×60 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "Catalogue reference speed and limiting speed are different limits: the 2,200 r/min reference is a thermal criterion under load, while the 2,400 r/min limiting value is the mechanical ceiling — observe both.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 651/1040 kN ratings are SKF catalogue values for this exact execution (23940 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23940 (cylindrical bore as listed, tapered-bore 23940 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23940 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23940?",
        "a": "The 23940 CC/W33 is a double-row spherical roller bearing with 200 mm bore, 280 mm outer diameter and 60 mm width (7.874 × 11.024 × 2.362 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 651 kN, C0 1040 kN, fatigue load limit Pu 93 kN, reference speed 2,200 r/min, limiting speed 2,400 r/min, mass about 11500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23940 bore code work?",
        "a": "The last two digits of 23940 are bore code 40, so 40 × 5 = 200 mm bore. The 280 mm OD and 60 mm width come from the ISO 15 dimension-series plan (dimension series 39 (compact OD, narrow)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23940?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23940 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23940K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23940 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23940",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23940-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on H3940 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23940",
      "23940 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23944",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23944 CC/W33",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 220,
    "D_mm": 300,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 661,
    "static_load_kN": 1080,
    "fatigue_load_limit_kN": 93,
    "max_rpm": 2200,
    "reference_speed_rpm": 2000,
    "limiting_speed_rpm": 2200,
    "weight_g": 12500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 220 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 23944 under catalogue execution 23944 CC/W33: two barrel-roller rows on a sphered outer raceway. The code breaks down as type digit 2 (double-row spherical roller), dimension series 39 (dimension series 39 (compact OD, narrow)), and bore code 44 = 220 mm; dimensions 220×300×60 mm therefore match the ISO 15 envelope. The suffix chain reads CC (two pressed-steel cages with a floating guide ring between the roller rows) plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK/W33 is the 1:12 tapered-bore counterpart. The 40.0 mm radial section height ((300−220)/2) and 12500 g catalogue mass frame a 220 mm bore bearing rated at 661 kN C — roughly 3.00 kN of dynamic capacity per millimetre of bore before application factors. After mounting, swing the outer ring to confirm free self-alignment: the 23944 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.",
    "applications": [
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals"
    ],
    "pitfalls": [
      "At 220 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23900-series series at 220 mm bore (300×60 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The 12500 g mass and 60 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23944.",
      "Shaft and housing fillets must clear the bearing chamfer so the 60 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 661/1080 kN ratings are SKF catalogue values for this exact execution (23944 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23944 (cylindrical bore as listed, tapered-bore 23944 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23944 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23944?",
        "a": "The 23944 CC/W33 is a double-row spherical roller bearing with 220 mm bore, 300 mm outer diameter and 60 mm width (8.661 × 11.811 × 2.362 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 661 kN, C0 1080 kN, fatigue load limit Pu 93 kN, reference speed 2,000 r/min, limiting speed 2,200 r/min, mass about 12500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23944 bore code work?",
        "a": "The last two digits of 23944 are bore code 44, so 44 × 5 = 220 mm bore. The 300 mm OD and 60 mm width come from the ISO 15 dimension-series plan (dimension series 39 (compact OD, narrow)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23944?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23944 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23944K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23944 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23944",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23944-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on OH3944 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23944",
      "23944 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23948",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23948 CC/W33",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 240,
    "D_mm": 320,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 685,
    "static_load_kN": 1160,
    "fatigue_load_limit_kN": 98,
    "max_rpm": 2000,
    "reference_speed_rpm": 1900,
    "limiting_speed_rpm": 2000,
    "weight_g": 13500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23948 CC/W33 is a 240×320×60 mm spherical roller bearing — the dimension series 39 (compact OD, narrow) entry for a 240 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. On the SKF nameplate, 23948 follows the ISO 15 convention: 2 for the spherical roller type, 39 for the dimension series 39 (compact OD, narrow), final digits 48 for the 240 mm bore. The suffix chain reads CC (two pressed-steel cages with a floating guide ring between the roller rows) plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK/W33 is the 1:12 tapered-bore counterpart. With C 685 kN and C0 1160 kN, the 23948 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.",
    "applications": [
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals"
    ],
    "pitfalls": [
      "At 240 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23900-series series at 240 mm bore (320×60 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23948 pits long before its L10 life.",
      "Catalogue reference speed and limiting speed are different limits: the 1,900 r/min reference is a thermal criterion under load, while the 2,000 r/min limiting value is the mechanical ceiling — observe both.",
      "The 685/1160 kN ratings are SKF catalogue values for this exact execution (23948 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23948 (cylindrical bore as listed, tapered-bore 23948 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23948 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23948?",
        "a": "The 23948 CC/W33 is a double-row spherical roller bearing with 240 mm bore, 320 mm outer diameter and 60 mm width (9.449 × 12.598 × 2.362 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 685 kN, C0 1160 kN, fatigue load limit Pu 98 kN, reference speed 1,900 r/min, limiting speed 2,000 r/min, mass about 13500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23948 bore code work?",
        "a": "The last two digits of 23948 are bore code 48, so 48 × 5 = 240 mm bore. The 320 mm OD and 60 mm width come from the ISO 15 dimension-series plan (dimension series 39 (compact OD, narrow)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23948?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23948 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23948K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23948 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23948",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23948-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on OH3948 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23948",
      "23948 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23952",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23952 CC/W33",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 260,
    "D_mm": 360,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1055,
    "static_load_kN": 1800,
    "fatigue_load_limit_kN": 156,
    "max_rpm": 1900,
    "reference_speed_rpm": 1700,
    "limiting_speed_rpm": 1900,
    "weight_g": 23500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF 23952 (23952 CC/W33) is the spherical-roller choice for a 260 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 360×75 mm ISO 15 envelope. The code breaks down as type digit 2 (double-row spherical roller), dimension series 39 (dimension series 39 (compact OD, narrow)), and bore code 52 = 260 mm; dimensions 260×360×75 mm therefore match the ISO 15 envelope. The suffix chain reads CC (two pressed-steel cages with a floating guide ring between the roller rows) plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK/W33 is the 1:12 tapered-bore counterpart. At 1,700 r/min reference speed the 50.0 mm-section 23952 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 1,900 r/min as the mechanical ceiling. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.",
    "applications": [
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "wind-turbine main shaft support"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "smearing on the roller-raceway contact during skid starts below the minimum load"
    ],
    "pitfalls": [
      "At 260 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23900-series series at 260 mm bore (360×75 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The 23500 g mass and 75 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23952.",
      "The 23952 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 1055/1800 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 1055/1800 kN ratings are SKF catalogue values for this exact execution (23952 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23952 (cylindrical bore as listed, tapered-bore 23952 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23952 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23952?",
        "a": "The 23952 CC/W33 is a double-row spherical roller bearing with 260 mm bore, 360 mm outer diameter and 75 mm width (10.236 × 14.173 × 2.953 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1055 kN, C0 1800 kN, fatigue load limit Pu 156 kN, reference speed 1,700 r/min, limiting speed 1,900 r/min, mass about 23500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23952 bore code work?",
        "a": "The last two digits of 23952 are bore code 52, so 52 × 5 = 260 mm bore. The 360 mm OD and 75 mm width come from the ISO 15 dimension-series plan (dimension series 39 (compact OD, narrow)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23952?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23952 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23952K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23952 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23952",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23952-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on OH3952 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23952",
      "23952 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23956",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23956 CC/W33",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 280,
    "D_mm": 380,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1016,
    "static_load_kN": 1760,
    "fatigue_load_limit_kN": 143,
    "max_rpm": 1700,
    "reference_speed_rpm": 1600,
    "limiting_speed_rpm": 1700,
    "weight_g": 25000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 23956 appears as 23956 CC/W33: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 280×380×75 mm to the ISO 15 boundary plan. Digit by digit, 23956 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 39, and bore reference 56 resolving to 280 mm; 380 mm OD and 75 mm width are the matching ISO 15 boundary values. The suffix chain reads CC (two pressed-steel cages with a floating guide ring between the roller rows) plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK/W33 is the 1:12 tapered-bore counterpart. At 1,600 r/min reference speed the 50.0 mm-section 23956 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 1,700 r/min as the mechanical ceiling. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 23956 CCK/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.",
    "applications": [
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "wind-turbine main shaft support"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "smearing on the roller-raceway contact during skid starts below the minimum load"
    ],
    "pitfalls": [
      "At 280 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23900-series series at 280 mm bore (380×75 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The 23956 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 1016/1760 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 1016/1760 kN ratings are SKF catalogue values for this exact execution (23956 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23956 (cylindrical bore as listed, tapered-bore 23956 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23956 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23956?",
        "a": "The 23956 CC/W33 is a double-row spherical roller bearing with 280 mm bore, 380 mm outer diameter and 75 mm width (11.024 × 14.961 × 2.953 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1016 kN, C0 1760 kN, fatigue load limit Pu 143 kN, reference speed 1,600 r/min, limiting speed 1,700 r/min, mass about 25000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23956 bore code work?",
        "a": "The last two digits of 23956 are bore code 56, so 56 × 5 = 280 mm bore. The 380 mm OD and 75 mm width come from the ISO 15 dimension-series plan (dimension series 39 (compact OD, narrow)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23956?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23956 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23956K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23956 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23956",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23956-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on OH3956 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23956",
      "23956 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23960",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23960 CC/W33",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 300,
    "D_mm": 420,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1413,
    "static_load_kN": 2500,
    "fatigue_load_limit_kN": 200,
    "max_rpm": 1600,
    "reference_speed_rpm": 1400,
    "limiting_speed_rpm": 1600,
    "weight_g": 39500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number 23960 CC/W33 in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 300 mm shaft, dimension series 39 (compact OD, narrow), with open execution and two pressed-steel cages with a floating guide ring. Numbering ties the bearing to its envelope: 23960 means spherical-roller type, dimension series 39, 300 mm bore — which is why the 420×90 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The suffix chain reads CC (two pressed-steel cages with a floating guide ring between the roller rows) plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK/W33 is the 1:12 tapered-bore counterpart. The 60.0 mm radial section height ((420−300)/2) and 39500 g catalogue mass frame a 300 mm bore bearing rated at 1413 kN C — roughly 4.71 kN of dynamic capacity per millimetre of bore before application factors. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 23960 CCK/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.",
    "applications": [
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "At 300 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23900-series series at 300 mm bore (420×90 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23960; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23960 pits long before its L10 life.",
      "The 1413/2500 kN ratings are SKF catalogue values for this exact execution (23960 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23960 (cylindrical bore as listed, tapered-bore 23960 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23960 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23960?",
        "a": "The 23960 CC/W33 is a double-row spherical roller bearing with 300 mm bore, 420 mm outer diameter and 90 mm width (11.811 × 16.535 × 3.543 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1413 kN, C0 2500 kN, fatigue load limit Pu 200 kN, reference speed 1,400 r/min, limiting speed 1,600 r/min, mass about 39500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23960 bore code work?",
        "a": "The last two digits of 23960 are bore code 60, so 60 × 5 = 300 mm bore. The 420 mm OD and 90 mm width come from the ISO 15 dimension-series plan (dimension series 39 (compact OD, narrow)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23960?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23960 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23960K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23960 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23960",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23960-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on OH3960 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23960",
      "23960 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23964",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23964 CC/W33",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 320,
    "D_mm": 440,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1480,
    "static_load_kN": 2700,
    "fatigue_load_limit_kN": 212,
    "max_rpm": 1500,
    "reference_speed_rpm": 1400,
    "limiting_speed_rpm": 1500,
    "weight_g": 42000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23964 CC/W33 belongs to the SKF spherical roller range — the 320 mm bore entry in the 23900-series series (dimension series 39 (compact OD, narrow)), dimensioned 440 mm OD and 90 mm wide. Digit by digit, 23964 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 39, and bore reference 64 resolving to 320 mm; 440 mm OD and 90 mm width are the matching ISO 15 boundary values. The suffix chain reads CC (two pressed-steel cages with a floating guide ring between the roller rows) plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK/W33 is the 1:12 tapered-bore counterpart. With C 1480 kN and C0 2700 kN, the 23964 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 320 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.",
    "applications": [
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "At 320 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23900-series series at 320 mm bore (440×90 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The 23964 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 1480/2700 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23964; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 1480/2700 kN ratings are SKF catalogue values for this exact execution (23964 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23964 (cylindrical bore as listed, tapered-bore 23964 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23964 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23964?",
        "a": "The 23964 CC/W33 is a double-row spherical roller bearing with 320 mm bore, 440 mm outer diameter and 90 mm width (12.598 × 17.323 × 3.543 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1480 kN, C0 2700 kN, fatigue load limit Pu 212 kN, reference speed 1,400 r/min, limiting speed 1,500 r/min, mass about 42000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23964 bore code work?",
        "a": "The last two digits of 23964 are bore code 64, so 64 × 5 = 320 mm bore. The 440 mm OD and 90 mm width come from the ISO 15 dimension-series plan (dimension series 39 (compact OD, narrow)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23964?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23964 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23964K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23964 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23964",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23964-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on OH3964 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23964",
      "23964 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23968",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23968 CC/W33",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 340,
    "D_mm": 460,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1490,
    "static_load_kN": 2800,
    "fatigue_load_limit_kN": 216,
    "max_rpm": 1400,
    "reference_speed_rpm": 1300,
    "limiting_speed_rpm": 1400,
    "weight_g": 45500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23968 is a double-row spherical roller bearing in the 23900-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. Reading the designation: the leading 2 marks a spherical roller bearing, the 39 is the ISO 15 dimension series (dimension series 39 (compact OD, narrow)), and the last two digits encode the 340 mm bore; the 460 mm OD and 90 mm width follow the ISO 15 general plan. The suffix chain reads CC (two pressed-steel cages with a floating guide ring between the roller rows) plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK/W33 is the 1:12 tapered-bore counterpart. Catalogue mass 45500 g for the 340×460×90 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. Mount with the spherical bearing's self-alignment in mind: it compensates ≈ 0.5–2.5° of misalignment depending on series, but the shaft and housing seats still set the datum — a rotating inner ring on a 340 mm shaft typically takes a m6 seat with an H7 housing bore.",
    "applications": [
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "At 340 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23900-series series at 340 mm bore (460×90 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 23968 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 1490/2800 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 1490/2800 kN ratings are SKF catalogue values for this exact execution (23968 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23968 (cylindrical bore as listed, tapered-bore 23968 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23968 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23968?",
        "a": "The 23968 CC/W33 is a double-row spherical roller bearing with 340 mm bore, 460 mm outer diameter and 90 mm width (13.386 × 18.11 × 3.543 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1490 kN, C0 2800 kN, fatigue load limit Pu 216 kN, reference speed 1,300 r/min, limiting speed 1,400 r/min, mass about 45500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23968 bore code work?",
        "a": "The last two digits of 23968 are bore code 68, so 68 × 5 = 340 mm bore. The 460 mm OD and 90 mm width come from the ISO 15 dimension-series plan (dimension series 39 (compact OD, narrow)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23968?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23968 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23968K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23968 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23968",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23968-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on OH3968 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23968",
      "23968 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23972",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23972 CC/W33",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 360,
    "D_mm": 480,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1456,
    "static_load_kN": 2750,
    "fatigue_load_limit_kN": 220,
    "max_rpm": 1300,
    "reference_speed_rpm": 1200,
    "limiting_speed_rpm": 1300,
    "weight_g": 46000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 360 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 23972 under catalogue execution 23972 CC/W33: two barrel-roller rows on a sphered outer raceway. Digit by digit, 23972 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 39, and bore reference 72 resolving to 360 mm; 480 mm OD and 90 mm width are the matching ISO 15 boundary values. The suffix chain reads CC (two pressed-steel cages with a floating guide ring between the roller rows) plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK/W33 is the 1:12 tapered-bore counterpart. Selection arithmetic: the C0/C ratio is about 1.89 (static 2750 kN against dynamic 1456 kN), typical of a spherical roller sized for heavy combined loads, and the 220 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Mount with the spherical bearing's self-alignment in mind: it compensates ≈ 0.5–2.5° of misalignment depending on series, but the shaft and housing seats still set the datum — a rotating inner ring on a 360 mm shaft typically takes a m6 seat with an H7 housing bore.",
    "applications": [
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "At 360 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23900-series series at 360 mm bore (480×90 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The 23972 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 1456/2750 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 46000 g mass and 90 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23972.",
      "The 1456/2750 kN ratings are SKF catalogue values for this exact execution (23972 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23972 (cylindrical bore as listed, tapered-bore 23972 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23972 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23972?",
        "a": "The 23972 CC/W33 is a double-row spherical roller bearing with 360 mm bore, 480 mm outer diameter and 90 mm width (14.173 × 18.898 × 3.543 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1456 kN, C0 2750 kN, fatigue load limit Pu 220 kN, reference speed 1,200 r/min, limiting speed 1,300 r/min, mass about 46000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23972 bore code work?",
        "a": "The last two digits of 23972 are bore code 72, so 72 × 5 = 360 mm bore. The 480 mm OD and 90 mm width come from the ISO 15 dimension-series plan (dimension series 39 (compact OD, narrow)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23972?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23972 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23972K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23972 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23972",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23972-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on OH3972 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C3972-M",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 3972 M shares the 360×480×90 mm envelope but catalogue C/C0 differ (1760/3250 kN vs 1456/2750 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C3972-KM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 3972 KM shares the 360×480×90 mm envelope but catalogue C/C0 differ (1760/3250 kN vs 1456/2750 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23972",
      "23972 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23976",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23976 CC/W33",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 380,
    "D_mm": 520,
    "B_mm": 106,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 2011,
    "static_load_kN": 3800,
    "fatigue_load_limit_kN": 285,
    "max_rpm": 1200,
    "reference_speed_rpm": 1100,
    "limiting_speed_rpm": 1200,
    "weight_g": 69000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23976 CC/W33 is a 380×520×106 mm spherical roller bearing — the dimension series 39 (compact OD, narrow) entry for a 380 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. Reading the designation: the leading 2 marks a spherical roller bearing, the 39 is the ISO 15 dimension series (dimension series 39 (compact OD, narrow)), and the last two digits encode the 380 mm bore; the 520 mm OD and 106 mm width follow the ISO 15 general plan. SKF basic executions here are E or CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Selection arithmetic: the C0/C ratio is about 1.89 (static 3800 kN against dynamic 2011 kN), typical of a spherical roller sized for heavy combined loads, and the 285 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 106 mm width across two roller rows needs the full charge.",
    "applications": [
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At 380 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23900-series series at 380 mm bore (520×106 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "Shaft and housing fillets must clear the bearing chamfer so the 106 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 2011/3800 kN ratings are SKF catalogue values for this exact execution (23976 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23976 (cylindrical bore as listed, tapered-bore 23976 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23976 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23976?",
        "a": "The 23976 CC/W33 is a double-row spherical roller bearing with 380 mm bore, 520 mm outer diameter and 106 mm width (14.961 × 20.472 × 4.173 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2011 kN, C0 3800 kN, fatigue load limit Pu 285 kN, reference speed 1,100 r/min, limiting speed 1,200 r/min, mass about 69000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23976 bore code work?",
        "a": "The last two digits of 23976 are bore code 76, so 76 × 5 = 380 mm bore. The 520 mm OD and 106 mm width come from the ISO 15 dimension-series plan (dimension series 39 (compact OD, narrow)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23976?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23976 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23976K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23976 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23976",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23976-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on OH3976 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23976",
      "23976 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23980",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23980 CC/W33",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 400,
    "D_mm": 540,
    "B_mm": 106,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 2038,
    "static_load_kN": 3900,
    "fatigue_load_limit_kN": 290,
    "max_rpm": 1200,
    "reference_speed_rpm": 1100,
    "limiting_speed_rpm": 1200,
    "weight_g": 71000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF 23980 (23980 CC/W33) is the spherical-roller choice for a 400 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 540×106 mm ISO 15 envelope. Digit by digit, 23980 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 39, and bore reference 80 resolving to 400 mm; 540 mm OD and 106 mm width are the matching ISO 15 boundary values. SKF basic executions here are E or CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. With C 2038 kN and C0 3900 kN, the 23980 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 106 mm width across two roller rows needs the full charge.",
    "applications": [
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 400 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23900-series series at 400 mm bore (540×106 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The 23980 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 2038/3900 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23980; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 2038/3900 kN ratings are SKF catalogue values for this exact execution (23980 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23980 (cylindrical bore as listed, tapered-bore 23980 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23980 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23980?",
        "a": "The 23980 CC/W33 is a double-row spherical roller bearing with 400 mm bore, 540 mm outer diameter and 106 mm width (15.748 × 21.26 × 4.173 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2038 kN, C0 3900 kN, fatigue load limit Pu 290 kN, reference speed 1,100 r/min, limiting speed 1,200 r/min, mass about 71000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23980 bore code work?",
        "a": "The last two digits of 23980 are bore code 80, so 80 × 5 = 400 mm bore. The 540 mm OD and 106 mm width come from the ISO 15 dimension-series plan (dimension series 39 (compact OD, narrow)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23980?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23980 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23980K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23980 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23980",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23980-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on OH3980 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C3980-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3980 KM shares the 400×540×106 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23980",
      "23980 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23984",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23984 CC/W33",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 420,
    "D_mm": 560,
    "B_mm": 106,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 2083,
    "static_load_kN": 4150,
    "fatigue_load_limit_kN": 300,
    "max_rpm": 1100,
    "reference_speed_rpm": 1000,
    "limiting_speed_rpm": 1100,
    "weight_g": 74500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 23984 appears as 23984 CC/W33: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 420×560×106 mm to the ISO 15 boundary plan. Reading the designation: the leading 2 marks a spherical roller bearing, the 39 is the ISO 15 dimension series (dimension series 39 (compact OD, narrow)), and the last two digits encode the 420 mm bore; the 560 mm OD and 106 mm width follow the ISO 15 general plan. SKF basic executions here are E or CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Catalogue mass 74500 g for the 420×560×106 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. After mounting, swing the outer ring to confirm free self-alignment: the 23984 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.",
    "applications": [
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 420 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23900-series series at 420 mm bore (560×106 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 23984 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 2083/4150 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 2083/4150 kN ratings are SKF catalogue values for this exact execution (23984 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23984 (cylindrical bore as listed, tapered-bore 23984 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23984 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23984?",
        "a": "The 23984 CC/W33 is a double-row spherical roller bearing with 420 mm bore, 560 mm outer diameter and 106 mm width (16.535 × 22.047 × 4.173 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2083 kN, C0 4150 kN, fatigue load limit Pu 300 kN, reference speed 1,000 r/min, limiting speed 1,100 r/min, mass about 74500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23984 bore code work?",
        "a": "The last two digits of 23984 are bore code 84, so 84 × 5 = 420 mm bore. The 560 mm OD and 106 mm width come from the ISO 15 dimension-series plan (dimension series 39 (compact OD, narrow)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23984?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23984 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23984K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23984 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23984",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23984-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on OH3984 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C3984-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3984 M shares the 420×560×106 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C3984-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3984 KM shares the 420×560×106 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23984",
      "23984 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23988",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23988 CC/W33",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 440,
    "D_mm": 600,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 2506,
    "static_load_kN": 4900,
    "fatigue_load_limit_kN": 345,
    "max_rpm": 1000,
    "reference_speed_rpm": 950,
    "limiting_speed_rpm": 1000,
    "weight_g": 99500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number 23988 CC/W33 in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 440 mm shaft, dimension series 39 (compact OD, narrow), with open execution and two pressed-steel cages with a floating guide ring. The code breaks down as type digit 2 (double-row spherical roller), dimension series 39 (dimension series 39 (compact OD, narrow)), and bore code 88 = 440 mm; dimensions 440×600×118 mm therefore match the ISO 15 envelope. SKF basic executions here are E or CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. The 345 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.96 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.",
    "applications": [
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 440 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23900-series series at 440 mm bore (600×118 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "Shaft and housing fillets must clear the bearing chamfer so the 118 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 2506/4900 kN ratings are SKF catalogue values for this exact execution (23988 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23988 (cylindrical bore as listed, tapered-bore 23988 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23988 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23988?",
        "a": "The 23988 CC/W33 is a double-row spherical roller bearing with 440 mm bore, 600 mm outer diameter and 118 mm width (17.323 × 23.622 × 4.646 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2506 kN, C0 4900 kN, fatigue load limit Pu 345 kN, reference speed 950 r/min, limiting speed 1,000 r/min, mass about 99500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 23988 bore code work?",
        "a": "The last two digits of 23988 are bore code 88, so 88 × 5 = 440 mm bore. The 600 mm OD and 118 mm width come from the ISO 15 dimension-series plan (dimension series 39 (compact OD, narrow)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 23988?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23988 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23988K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23988 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23988-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 440×600×118 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "23988",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23988-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on OH3988 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23988",
      "23988 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23992",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23992 CA/W33",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 460,
    "D_mm": 620,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2558,
    "static_load_kN": 5000,
    "fatigue_load_limit_kN": 355,
    "max_rpm": 1000,
    "reference_speed_rpm": 600,
    "limiting_speed_rpm": 1000,
    "weight_g": 105000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23992 CA/W33 belongs to the SKF spherical roller range — the 460 mm bore entry in the 23900-series series (dimension series 39 (compact OD, narrow)), dimensioned 620 mm OD and 118 mm wide. Reading the designation: the leading 2 marks a spherical roller bearing, the 39 is the ISO 15 dimension series (dimension series 39 (compact OD, narrow)), and the last two digits encode the 460 mm bore; the 620 mm OD and 118 mm width follow the ISO 15 general plan. CA executions here use a machined brass cage (inner-ring-guided) rather than pressed steel; specialist suffixes change the bearing materially and must be quoted in full, and the K/CCK tapered-bore variant is a separate order number. Speed planning uses two different ceilings: 600 r/min thermal reference and 1,000 r/min mechanical limiting speed. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.",
    "applications": [
      "large mining crusher main shafts",
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems"
    ],
    "pitfalls": [
      "At 460 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23900-series series at 460 mm bore (620×118 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23992 pits long before its L10 life.",
      "The 2558/5000 kN ratings are SKF catalogue values for this exact execution (23992 CA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23992 (cylindrical bore as listed, tapered-bore 23992 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23992 CA/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23992?",
        "a": "The 23992 CA/W33 is a double-row spherical roller bearing with 460 mm bore, 620 mm outer diameter and 118 mm width (18.11 × 24.409 × 4.646 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2558 kN, C0 5000 kN, fatigue load limit Pu 355 kN, reference speed 600 r/min, limiting speed 1,000 r/min, mass about 105000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)."
      },
      {
        "q": "How does the 23992 bore code work?",
        "a": "The last two digits of 23992 are bore code 92, so 92 × 5 = 460 mm bore. The 620 mm OD and 118 mm width come from the ISO 15 dimension-series plan (dimension series 39 (compact OD, narrow)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CA/W33 suffix mean on 23992?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23992 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23992K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23992 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23992-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "23992",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23992-CAK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on OH3992 adapter sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23992",
      "23992 CA/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23996",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23996 CA/W33",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 480,
    "D_mm": 650,
    "B_mm": 128,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2990,
    "static_load_kN": 5700,
    "fatigue_load_limit_kN": 405,
    "max_rpm": 1000,
    "reference_speed_rpm": 560,
    "limiting_speed_rpm": 1000,
    "weight_g": 125000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23996 is a double-row spherical roller bearing in the 23900-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. The code breaks down as type digit 2 (double-row spherical roller), dimension series 39 (dimension series 39 (compact OD, narrow)), and bore code 96 = 480 mm; dimensions 480×650×128 mm therefore match the ISO 15 envelope. CA executions here use a machined brass cage (inner-ring-guided) rather than pressed steel; specialist suffixes change the bearing materially and must be quoted in full, and the K/CCK tapered-bore variant is a separate order number. The 85.0 mm radial section height ((650−480)/2) and 125000 g catalogue mass frame a 480 mm bore bearing rated at 2990 kN C — roughly 6.23 kN of dynamic capacity per millimetre of bore before application factors. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 23996 CCK/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.",
    "applications": [
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems"
    ],
    "pitfalls": [
      "At 480 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23900-series series at 480 mm bore (650×128 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "Shaft and housing fillets must clear the bearing chamfer so the 128 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23996; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 2990/5700 kN ratings are SKF catalogue values for this exact execution (23996 CA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 23996 (cylindrical bore as listed, tapered-bore 23996 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23996 CA/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23996?",
        "a": "The 23996 CA/W33 is a double-row spherical roller bearing with 480 mm bore, 650 mm outer diameter and 128 mm width (18.898 × 25.591 × 5.039 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2990 kN, C0 5700 kN, fatigue load limit Pu 405 kN, reference speed 560 r/min, limiting speed 1,000 r/min, mass about 125000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)."
      },
      {
        "q": "How does the 23996 bore code work?",
        "a": "The last two digits of 23996 are bore code 96, so 96 × 5 = 480 mm bore. The 650 mm OD and 128 mm width come from the ISO 15 dimension-series plan (dimension series 39 (compact OD, narrow)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CA/W33 suffix mean on 23996?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart."
      },
      {
        "q": "Can 23996 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 23996K variant be used instead?",
        "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23996 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23996-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 480×650×128 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "23996",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "23996-CAK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) execution on OH3996 adapter sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C3996-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3996 M shares the 480×650×128 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23996",
      "23996 CA/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24013",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24013 CC/W33",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 65,
    "D_mm": 100,
    "B_mm": 35,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 137,
    "static_load_kN": 173,
    "fatigue_load_limit_kN": 20.4,
    "max_rpm": 6300,
    "reference_speed_rpm": 4300,
    "limiting_speed_rpm": 6300,
    "weight_g": 950,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24013 is a double-row spherical roller bearing in the 24000-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. On the SKF nameplate, 24013 follows the ISO 15 convention: 2 for the spherical roller type, 40 for the dimension series 40 (compact OD, maximum width), final digits 13 for the 65 mm bore. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Catalogue mass 950 g for the 65×100×35 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. A 65 mm rotating inner ring usually runs k5 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.",
    "applications": [
      "marine propulsion and thruster shafts",
      "cement-mill trunnion and drive shafts",
      "heavy conveyor head shafts in mining",
      "jaw and cone crusher main shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems"
    ],
    "pitfalls": [
      "Mount the 65 mm bore 24013 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 24000-series series at 65 mm bore (100×35 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.",
      "Never use the tapered-bore CCK30/K30 variant's drive-up figures on this cylindrical-bore 24013; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 950 g mass and 35 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 24013.",
      "The 137/173 kN ratings are SKF catalogue values for this exact execution (24013 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24013 (cylindrical bore as listed, tapered-bore 24013 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24013 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24013?",
        "a": "The 24013 CC/W33 is a double-row spherical roller bearing with 65 mm bore, 100 mm outer diameter and 35 mm width (2.559 × 3.937 × 1.378 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 137 kN, C0 173 kN, fatigue load limit Pu 20.4 kN, reference speed 4,300 r/min, limiting speed 6,300 r/min, mass about 950 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 24013 bore code work?",
        "a": "The last two digits of 24013 are bore code 13, so 13 × 5 = 65 mm bore. The 100 mm OD and 35 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 24013?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper."
      },
      {
        "q": "Can 24013 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24013K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24013 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24013",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "C4013-2CS5V-GEM9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 4013-2CS5V/GEM9 shares the 65×100×35 mm envelope but catalogue C/C0 differ (102/173 kN vs 137/173 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24013",
      "24013 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24015",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24015 CC/W33",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 75,
    "D_mm": 115,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 181,
    "static_load_kN": 232,
    "fatigue_load_limit_kN": 28.5,
    "max_rpm": 5300,
    "reference_speed_rpm": 3800,
    "limiting_speed_rpm": 5300,
    "weight_g": 1550,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 24015 appears as 24015 CC/W33: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 75×115×40 mm to the ISO 15 boundary plan. Reading the designation: the leading 2 marks a spherical roller bearing, the 40 is the ISO 15 dimension series (dimension series 40 (compact OD, maximum width)), and the last two digits encode the 75 mm bore; the 115 mm OD and 40 mm width follow the ISO 15 general plan. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Speed planning uses two different ceilings: 3,800 r/min thermal reference and 5,300 r/min mechanical limiting speed. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 24015 CCK30/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.",
    "applications": [
      "paper-machine press and dryer rolls",
      "rolling-mill pinion and back-up shafts",
      "large vibrating screens and feeders",
      "marine propulsion and thruster shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Mount the 75 mm bore 24015 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 24000-series series at 75 mm bore (115×40 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.",
      "Catalogue reference speed and limiting speed are different limits: the 3,800 r/min reference is a thermal criterion under load, while the 5,300 r/min limiting value is the mechanical ceiling — observe both.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 181/232 kN ratings are SKF catalogue values for this exact execution (24015 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24015 (cylindrical bore as listed, tapered-bore 24015 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24015 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24015?",
        "a": "The 24015 CC/W33 is a double-row spherical roller bearing with 75 mm bore, 115 mm outer diameter and 40 mm width (2.953 × 4.528 × 1.575 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 181 kN, C0 232 kN, fatigue load limit Pu 28.5 kN, reference speed 3,800 r/min, limiting speed 5,300 r/min, mass about 1550 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 24015 bore code work?",
        "a": "The last two digits of 24015 are bore code 15, so 15 × 5 = 75 mm bore. The 115 mm OD and 40 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 24015?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper."
      },
      {
        "q": "Can 24015 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24015K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24015 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24015",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "C4015-V",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 4015 V shares the 75×115×40 mm envelope but catalogue C/C0 differ (208/345 kN vs 181/232 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24015",
      "24015 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24020",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24020 CC/W33",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 100,
    "D_mm": 150,
    "B_mm": 50,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 296,
    "static_load_kN": 415,
    "fatigue_load_limit_kN": 45.5,
    "max_rpm": 4000,
    "reference_speed_rpm": 2800,
    "limiting_speed_rpm": 4000,
    "weight_g": 3150,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24020 is a double-row spherical roller bearing in the 24000-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. Numbering ties the bearing to its envelope: 24020 means spherical-roller type, dimension series 40, 100 mm bore — which is why the 150×50 mm outline swaps dimensionally with other ISO 15 bearings of the same code. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. At 2,800 r/min reference speed the 25.0 mm-section 24020 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 4,000 r/min as the mechanical ceiling. Mount with the spherical bearing's self-alignment in mind: it compensates ≈ 0.5–2.5° of misalignment depending on series, but the shaft and housing seats still set the datum — a rotating inner ring on a 100 mm shaft typically takes a k5 seat with an H7 housing bore.",
    "applications": [
      "heavy conveyor head shafts in mining",
      "jaw and cone crusher main shafts",
      "paper-machine press and dryer rolls",
      "rolling-mill pinion and back-up shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Mount the 100 mm bore 24020 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 24000-series series at 100 mm bore (150×50 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.",
      "The 3150 g mass and 50 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 24020.",
      "The 24020 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 296/415 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 296/415 kN ratings are SKF catalogue values for this exact execution (24020 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24020 (cylindrical bore as listed, tapered-bore 24020 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24020 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24020?",
        "a": "The 24020 CC/W33 is a double-row spherical roller bearing with 100 mm bore, 150 mm outer diameter and 50 mm width (3.937 × 5.906 × 1.969 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 296 kN, C0 415 kN, fatigue load limit Pu 45.5 kN, reference speed 2,800 r/min, limiting speed 4,000 r/min, mass about 3150 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 24020 bore code work?",
        "a": "The last two digits of 24020 are bore code 20, so 20 × 5 = 100 mm bore. The 150 mm OD and 50 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 24020?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper."
      },
      {
        "q": "Can 24020 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24020K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24020 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24020",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "C4020-V",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 4020 V shares the 100×150×50 mm envelope but catalogue C/C0 differ (355/530 kN vs 296/415 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24020",
      "24020 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24022",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24022 CC/W33",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 170,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 437,
    "static_load_kN": 620,
    "fatigue_load_limit_kN": 67,
    "max_rpm": 3600,
    "reference_speed_rpm": 2400,
    "limiting_speed_rpm": 3600,
    "weight_g": 5000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 24022 appears as 24022 CC/W33: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 110×170×60 mm to the ISO 15 boundary plan. The code breaks down as type digit 2 (double-row spherical roller), dimension series 40 (dimension series 40 (compact OD, maximum width)), and bore code 22 = 110 mm; dimensions 110×170×60 mm therefore match the ISO 15 envelope. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. With C 437 kN and C0 620 kN, the 24022 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.",
    "applications": [
      "large vibrating screens and feeders",
      "marine propulsion and thruster shafts",
      "cement-mill trunnion and drive shafts",
      "heavy conveyor head shafts in mining"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems"
    ],
    "pitfalls": [
      "Mount the 110 mm bore 24022 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 24000-series series at 110 mm bore (170×60 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 5000 g mass and 60 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 24022.",
      "The 437/620 kN ratings are SKF catalogue values for this exact execution (24022 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24022 (cylindrical bore as listed, tapered-bore 24022 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24022 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24022?",
        "a": "The 24022 CC/W33 is a double-row spherical roller bearing with 110 mm bore, 170 mm outer diameter and 60 mm width (4.331 × 6.693 × 2.362 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 437 kN, C0 620 kN, fatigue load limit Pu 67 kN, reference speed 2,400 r/min, limiting speed 3,600 r/min, mass about 5000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 24022 bore code work?",
        "a": "The last two digits of 24022 are bore code 22, so 22 × 5 = 110 mm bore. The 170 mm OD and 60 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 24022?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper."
      },
      {
        "q": "Can 24022 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24022K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24022 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24022",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "C4022-2CS5V-GEM9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 4022-2CS5V/GEM9 shares the 110×170×60 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C4022-MB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 4022 MB shares the 110×170×60 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C4022-V",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 4022 V shares the 110×170×60 mm envelope but catalogue C/C0 differ (500/800 kN vs 437/620 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24022",
      "24022 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24024",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24024 CC/W33",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 180,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 456,
    "static_load_kN": 670,
    "fatigue_load_limit_kN": 68,
    "max_rpm": 3400,
    "reference_speed_rpm": 2400,
    "limiting_speed_rpm": 3400,
    "weight_g": 5450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 120 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 24024 under catalogue execution 24024 CC/W33: two barrel-roller rows on a sphered outer raceway. Digit by digit, 24024 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 40, and bore reference 24 resolving to 120 mm; 180 mm OD and 60 mm width are the matching ISO 15 boundary values. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Selection arithmetic: the C0/C ratio is about 1.47 (static 670 kN against dynamic 456 kN), typical of a spherical roller sized for heavy combined loads, and the 68 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. A 120 mm rotating inner ring usually runs m6 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.",
    "applications": [
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At 120 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 24000-series series at 120 mm bore (180×60 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 24024 pits long before its L10 life.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 456/670 kN ratings are SKF catalogue values for this exact execution (24024 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24024 (cylindrical bore as listed, tapered-bore 24024 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24024 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24024?",
        "a": "The 24024 CC/W33 is a double-row spherical roller bearing with 120 mm bore, 180 mm outer diameter and 60 mm width (4.724 × 7.087 × 2.362 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 456 kN, C0 670 kN, fatigue load limit Pu 68 kN, reference speed 2,400 r/min, limiting speed 3,400 r/min, mass about 5450 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 24024 bore code work?",
        "a": "The last two digits of 24024 are bore code 24, so 24 × 5 = 120 mm bore. The 180 mm OD and 60 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 24024?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper."
      },
      {
        "q": "Can 24024 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24024K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24024 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24024",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24024-CCK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AH24024 withdrawal sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C4024-2CS5V-GEM9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 4024-2CS5V/GEM9 shares the 120×180×60 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C4024-V-VE240",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 4024 V/VE240 shares the 120×180×60 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C4024-K30V-VE240",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 4024 K30V/VE240 shares the 120×180×60 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C4024-V",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 4024 V shares the 120×180×60 mm envelope but catalogue C/C0 differ (530/880 kN vs 456/670 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C4024-K30V",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 4024 K30V shares the 120×180×60 mm envelope but catalogue C/C0 differ (530/880 kN vs 456/670 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24024",
      "24024 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24026",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24026 CC/W33",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 200,
    "B_mm": 69,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 569,
    "static_load_kN": 815,
    "fatigue_load_limit_kN": 81.5,
    "max_rpm": 3000,
    "reference_speed_rpm": 2000,
    "limiting_speed_rpm": 3000,
    "weight_g": 8050,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number 24026 CC/W33 in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 130 mm shaft, dimension series 40 (compact OD, maximum width), with open execution and two pressed-steel cages with a floating guide ring. On the SKF nameplate, 24026 follows the ISO 15 convention: 2 for the spherical roller type, 40 for the dimension series 40 (compact OD, maximum width), final digits 26 for the 130 mm bore. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Catalogue mass 8050 g for the 130×200×69 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 24026 CCK30/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.",
    "applications": [
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems"
    ],
    "pitfalls": [
      "At 130 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 24000-series series at 130 mm bore (200×69 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.",
      "Shaft and housing fillets must clear the bearing chamfer so the 69 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 24026 pits long before its L10 life.",
      "The 569/815 kN ratings are SKF catalogue values for this exact execution (24026 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24026 (cylindrical bore as listed, tapered-bore 24026 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24026 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24026?",
        "a": "The 24026 CC/W33 is a double-row spherical roller bearing with 130 mm bore, 200 mm outer diameter and 69 mm width (5.118 × 7.874 × 2.717 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 569 kN, C0 815 kN, fatigue load limit Pu 81.5 kN, reference speed 2,000 r/min, limiting speed 3,000 r/min, mass about 8050 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 24026 bore code work?",
        "a": "The last two digits of 24026 are bore code 26, so 26 × 5 = 130 mm bore. The 200 mm OD and 69 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 24026?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper."
      },
      {
        "q": "Can 24026 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24026K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24026 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24026",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24026-CCK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AH24026 withdrawal sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C4026-2CS5V-GEM9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 4026-2CS5V/GEM9 shares the 130×200×69 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C4026",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 4026 shares the 130×200×69 mm envelope but catalogue C/C0 differ (620/930 kN vs 569/815 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C4026-K30",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 4026 K30 shares the 130×200×69 mm envelope but catalogue C/C0 differ (620/930 kN vs 569/815 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C4026-V",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 4026 V shares the 130×200×69 mm envelope but catalogue C/C0 differ (720/1120 kN vs 569/815 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C4026-K30V",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 4026 K30V shares the 130×200×69 mm envelope but catalogue C/C0 differ (720/1120 kN vs 569/815 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24026",
      "24026 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24028",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24028 CC/W33",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 210,
    "B_mm": 69,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 600,
    "static_load_kN": 900,
    "fatigue_load_limit_kN": 88,
    "max_rpm": 2800,
    "reference_speed_rpm": 2000,
    "limiting_speed_rpm": 2800,
    "weight_g": 8550,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 24028 CC/W33 is a 140×210×69 mm spherical roller bearing — the dimension series 40 (compact OD, maximum width) entry for a 140 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. Reading the designation: the leading 2 marks a spherical roller bearing, the 40 is the ISO 15 dimension series (dimension series 40 (compact OD, maximum width)), and the last two digits encode the 140 mm bore; the 210 mm OD and 69 mm width follow the ISO 15 general plan. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Speed planning uses two different ceilings: 2,000 r/min thermal reference and 2,800 r/min mechanical limiting speed. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 69 mm width across two roller rows needs the full charge.",
    "applications": [
      "large mining crusher main shafts",
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At 140 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 24000-series series at 140 mm bore (210×69 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.",
      "Never use the tapered-bore CCK30/K30 variant's drive-up figures on this cylindrical-bore 24028; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "Shaft and housing fillets must clear the bearing chamfer so the 69 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 600/900 kN ratings are SKF catalogue values for this exact execution (24028 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24028 (cylindrical bore as listed, tapered-bore 24028 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24028 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24028?",
        "a": "The 24028 CC/W33 is a double-row spherical roller bearing with 140 mm bore, 210 mm outer diameter and 69 mm width (5.512 × 8.268 × 2.717 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 600 kN, C0 900 kN, fatigue load limit Pu 88 kN, reference speed 2,000 r/min, limiting speed 2,800 r/min, mass about 8550 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 24028 bore code work?",
        "a": "The last two digits of 24028 are bore code 28, so 28 × 5 = 140 mm bore. The 210 mm OD and 69 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 24028?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper."
      },
      {
        "q": "Can 24028 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24028K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24028 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24028",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24028-CCK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AH24028 withdrawal sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C4028-V",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 4028 V shares the 140×210×69 mm envelope but catalogue C/C0 differ (750/1220 kN vs 600/900 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C4028-K30V",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 4028 K30V shares the 140×210×69 mm envelope but catalogue C/C0 differ (750/1220 kN vs 600/900 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24028",
      "24028 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24030",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24030 CC/W33",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 225,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 680,
    "static_load_kN": 1040,
    "fatigue_load_limit_kN": 100,
    "max_rpm": 2600,
    "reference_speed_rpm": 1800,
    "limiting_speed_rpm": 2600,
    "weight_g": 10500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24030 CC/W33 belongs to the SKF spherical roller range — the 150 mm bore entry in the 24000-series series (dimension series 40 (compact OD, maximum width)), dimensioned 225 mm OD and 75 mm wide. The code breaks down as type digit 2 (double-row spherical roller), dimension series 40 (dimension series 40 (compact OD, maximum width)), and bore code 30 = 150 mm; dimensions 150×225×75 mm therefore match the ISO 15 envelope. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Selection arithmetic: the C0/C ratio is about 1.53 (static 1040 kN against dynamic 680 kN), typical of a spherical roller sized for heavy combined loads, and the 100 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 24030 CCK30/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.",
    "applications": [
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still"
    ],
    "pitfalls": [
      "At 150 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 24000-series series at 150 mm bore (225×75 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "Shaft and housing fillets must clear the bearing chamfer so the 75 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 680/1040 kN ratings are SKF catalogue values for this exact execution (24030 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24030 (cylindrical bore as listed, tapered-bore 24030 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24030 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24030?",
        "a": "The 24030 CC/W33 is a double-row spherical roller bearing with 150 mm bore, 225 mm outer diameter and 75 mm width (5.906 × 8.858 × 2.953 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 680 kN, C0 1040 kN, fatigue load limit Pu 100 kN, reference speed 1,800 r/min, limiting speed 2,600 r/min, mass about 10500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 24030 bore code work?",
        "a": "The last two digits of 24030 are bore code 30, so 30 × 5 = 150 mm bore. The 225 mm OD and 75 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 24030?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper."
      },
      {
        "q": "Can 24030 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24030K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24030 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24030",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24030-CCK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AH24030 withdrawal sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C4030-2CS5V-GEM9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 4030-2CS5V/GEM9 shares the 150×225×75 mm envelope but catalogue C/C0 differ (585/965 kN vs 680/1040 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C4030-V",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 4030 V shares the 150×225×75 mm envelope but catalogue C/C0 differ (780/1320 kN vs 680/1040 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C4030-K30V",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 4030 K30V shares the 150×225×75 mm envelope but catalogue C/C0 differ (780/1320 kN vs 680/1040 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24030",
      "24030 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24032",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24032 CC/W33",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 240,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 783,
    "static_load_kN": 1200,
    "fatigue_load_limit_kN": 114,
    "max_rpm": 2400,
    "reference_speed_rpm": 1700,
    "limiting_speed_rpm": 2400,
    "weight_g": 13000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF 24032 (24032 CC/W33) is the spherical-roller choice for a 160 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 240×80 mm ISO 15 envelope. Digit by digit, 24032 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 40, and bore reference 32 resolving to 160 mm; 240 mm OD and 80 mm width are the matching ISO 15 boundary values. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Catalogue mass 13000 g for the 160×240×80 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 80 mm width across two roller rows needs the full charge.",
    "applications": [
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 160 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 24000-series series at 160 mm bore (240×80 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 24032 pits long before its L10 life.",
      "Never use the tapered-bore CCK30/K30 variant's drive-up figures on this cylindrical-bore 24032; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 783/1200 kN ratings are SKF catalogue values for this exact execution (24032 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24032 (cylindrical bore as listed, tapered-bore 24032 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24032 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24032?",
        "a": "The 24032 CC/W33 is a double-row spherical roller bearing with 160 mm bore, 240 mm outer diameter and 80 mm width (6.299 × 9.449 × 3.15 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 783 kN, C0 1200 kN, fatigue load limit Pu 114 kN, reference speed 1,700 r/min, limiting speed 2,400 r/min, mass about 13000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 24032 bore code work?",
        "a": "The last two digits of 24032 are bore code 32, so 32 × 5 = 160 mm bore. The 240 mm OD and 80 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 24032?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper."
      },
      {
        "q": "Can 24032 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24032K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24032 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24032",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24032-CCK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AH24032 withdrawal sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C4032",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 4032 shares the 160×240×80 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C4032-K30",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 4032 K30 shares the 160×240×80 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C4032-2CS5V-GEM9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 4032-2CS5V/GEM9 shares the 160×240×80 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C4032-V",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 4032 V shares the 160×240×80 mm envelope but catalogue C/C0 differ (915/1460 kN vs 783/1200 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C4032-K30V",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 4032 K30V shares the 160×240×80 mm envelope but catalogue C/C0 differ (915/1460 kN vs 783/1200 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24032",
      "24032 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24034",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24034 CC/W33",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 260,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 963,
    "static_load_kN": 1460,
    "fatigue_load_limit_kN": 137,
    "max_rpm": 2400,
    "reference_speed_rpm": 1600,
    "limiting_speed_rpm": 2400,
    "weight_g": 17500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24034 is a double-row spherical roller bearing in the 24000-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. On the SKF nameplate, 24034 follows the ISO 15 convention: 2 for the spherical roller type, 40 for the dimension series 40 (compact OD, maximum width), final digits 34 for the 170 mm bore. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Speed planning uses two different ceilings: 1,600 r/min thermal reference and 2,400 r/min mechanical limiting speed. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 170 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.",
    "applications": [
      "large mining crusher main shafts",
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still"
    ],
    "pitfalls": [
      "At 170 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 24000-series series at 170 mm bore (260×90 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.",
      "Shaft and housing fillets must clear the bearing chamfer so the 90 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "Catalogue reference speed and limiting speed are different limits: the 1,600 r/min reference is a thermal criterion under load, while the 2,400 r/min limiting value is the mechanical ceiling — observe both.",
      "The 963/1460 kN ratings are SKF catalogue values for this exact execution (24034 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24034 (cylindrical bore as listed, tapered-bore 24034 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24034 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24034?",
        "a": "The 24034 CC/W33 is a double-row spherical roller bearing with 170 mm bore, 260 mm outer diameter and 90 mm width (6.693 × 10.236 × 3.543 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 963 kN, C0 1460 kN, fatigue load limit Pu 137 kN, reference speed 1,600 r/min, limiting speed 2,400 r/min, mass about 17500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 24034 bore code work?",
        "a": "The last two digits of 24034 are bore code 34, so 34 × 5 = 170 mm bore. The 260 mm OD and 90 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 24034?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper."
      },
      {
        "q": "Can 24034 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24034K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24034 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24034",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24034-CCK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AH24034 withdrawal sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C4034-V",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 4034 V shares the 170×260×90 mm envelope but catalogue C/C0 differ (1140/1860 kN vs 963/1460 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C4034-K30V",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 4034 K30V shares the 170×260×90 mm envelope but catalogue C/C0 differ (1140/1860 kN vs 963/1460 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24034",
      "24034 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24036",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24036 CC/W33",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 280,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1134,
    "static_load_kN": 1730,
    "fatigue_load_limit_kN": 156,
    "max_rpm": 2200,
    "reference_speed_rpm": 1500,
    "limiting_speed_rpm": 2200,
    "weight_g": 23000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 24036 appears as 24036 CC/W33: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 180×280×100 mm to the ISO 15 boundary plan. Reading the designation: the leading 2 marks a spherical roller bearing, the 40 is the ISO 15 dimension series (dimension series 40 (compact OD, maximum width)), and the last two digits encode the 180 mm bore; the 280 mm OD and 100 mm width follow the ISO 15 general plan. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. The 156 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.53 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. After mounting, swing the outer ring to confirm free self-alignment: the 24036 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.",
    "applications": [
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 180 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 24000-series series at 180 mm bore (280×100 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.",
      "Never use the tapered-bore CCK30/K30 variant's drive-up figures on this cylindrical-bore 24036; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 24036 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 1134/1730 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 1134/1730 kN ratings are SKF catalogue values for this exact execution (24036 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24036 (cylindrical bore as listed, tapered-bore 24036 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24036 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24036?",
        "a": "The 24036 CC/W33 is a double-row spherical roller bearing with 180 mm bore, 280 mm outer diameter and 100 mm width (7.087 × 11.024 × 3.937 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1134 kN, C0 1730 kN, fatigue load limit Pu 156 kN, reference speed 1,500 r/min, limiting speed 2,200 r/min, mass about 23000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 24036 bore code work?",
        "a": "The last two digits of 24036 are bore code 36, so 36 × 5 = 180 mm bore. The 280 mm OD and 100 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 24036?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper."
      },
      {
        "q": "Can 24036 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24036K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24036 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24036",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24036-CCK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AH24036 withdrawal sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C4036-V",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 4036 V shares the 180×280×100 mm envelope but catalogue C/C0 differ (1320/2120 kN vs 1134/1730 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24036",
      "24036 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24038",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24038 CC/W33",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 190,
    "D_mm": 290,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1164,
    "static_load_kN": 1800,
    "fatigue_load_limit_kN": 163,
    "max_rpm": 2000,
    "reference_speed_rpm": 1400,
    "limiting_speed_rpm": 2000,
    "weight_g": 24500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 190 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 24038 under catalogue execution 24038 CC/W33: two barrel-roller rows on a sphered outer raceway. Numbering ties the bearing to its envelope: 24038 means spherical-roller type, dimension series 40, 190 mm bore — which is why the 290×100 mm outline swaps dimensionally with other ISO 15 bearings of the same code. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. The 50.0 mm radial section height ((290−190)/2) and 24500 g catalogue mass frame a 190 mm bore bearing rated at 1164 kN C — roughly 6.13 kN of dynamic capacity per millimetre of bore before application factors. Mount with the spherical bearing's self-alignment in mind: it compensates ≈ 0.5–2.5° of misalignment depending on series, but the shaft and housing seats still set the datum — a rotating inner ring on a 190 mm shaft typically takes a m6 seat with an H7 housing bore.",
    "applications": [
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still"
    ],
    "pitfalls": [
      "At 190 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 24000-series series at 190 mm bore (290×100 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.",
      "Catalogue reference speed and limiting speed are different limits: the 1,400 r/min reference is a thermal criterion under load, while the 2,000 r/min limiting value is the mechanical ceiling — observe both.",
      "The 24500 g mass and 100 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 24038.",
      "The 1164/1800 kN ratings are SKF catalogue values for this exact execution (24038 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24038 (cylindrical bore as listed, tapered-bore 24038 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24038 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24038?",
        "a": "The 24038 CC/W33 is a double-row spherical roller bearing with 190 mm bore, 290 mm outer diameter and 100 mm width (7.48 × 11.417 × 3.937 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1164 kN, C0 1800 kN, fatigue load limit Pu 163 kN, reference speed 1,400 r/min, limiting speed 2,000 r/min, mass about 24500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 24038 bore code work?",
        "a": "The last two digits of 24038 are bore code 38, so 38 × 5 = 190 mm bore. The 290 mm OD and 100 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 24038?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper."
      },
      {
        "q": "Can 24038 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24038K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24038 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24038",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24038-CCK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AH24038 withdrawal sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24038",
      "24038 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24040",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24040 CC/W33",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 200,
    "D_mm": 310,
    "B_mm": 109,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1353,
    "static_load_kN": 2120,
    "fatigue_load_limit_kN": 186,
    "max_rpm": 1900,
    "reference_speed_rpm": 1300,
    "limiting_speed_rpm": 1900,
    "weight_g": 31000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number 24040 CC/W33 in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 200 mm shaft, dimension series 40 (compact OD, maximum width), with open execution and two pressed-steel cages with a floating guide ring. Digit by digit, 24040 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 40, and bore reference 40 resolving to 200 mm; 310 mm OD and 109 mm width are the matching ISO 15 boundary values. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Speed planning uses two different ceilings: 1,300 r/min thermal reference and 1,900 r/min mechanical limiting speed. After mounting, swing the outer ring to confirm free self-alignment: the 24040 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.",
    "applications": [
      "large mining crusher main shafts",
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems"
    ],
    "pitfalls": [
      "At 200 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 24000-series series at 200 mm bore (310×109 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 24040 pits long before its L10 life.",
      "The 31000 g mass and 109 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 24040.",
      "The 1353/2120 kN ratings are SKF catalogue values for this exact execution (24040 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24040 (cylindrical bore as listed, tapered-bore 24040 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24040 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24040?",
        "a": "The 24040 CC/W33 is a double-row spherical roller bearing with 200 mm bore, 310 mm outer diameter and 109 mm width (7.874 × 12.205 × 4.291 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1353 kN, C0 2120 kN, fatigue load limit Pu 186 kN, reference speed 1,300 r/min, limiting speed 1,900 r/min, mass about 31000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 24040 bore code work?",
        "a": "The last two digits of 24040 are bore code 40, so 40 × 5 = 200 mm bore. The 310 mm OD and 109 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 24040?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper."
      },
      {
        "q": "Can 24040 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24040K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24040 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24040",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24040-CCK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AH24040 withdrawal sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C4040-V",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 4040 V shares the 200×310×109 mm envelope but catalogue C/C0 differ (1630/2650 kN vs 1353/2120 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24040",
      "24040 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24044",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24044 CC/W33",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 220,
    "D_mm": 340,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1628,
    "static_load_kN": 2600,
    "fatigue_load_limit_kN": 212,
    "max_rpm": 1700,
    "reference_speed_rpm": 1200,
    "limiting_speed_rpm": 1700,
    "weight_g": 40000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24044 CC/W33 belongs to the SKF spherical roller range — the 220 mm bore entry in the 24000-series series (dimension series 40 (compact OD, maximum width)), dimensioned 340 mm OD and 118 mm wide. Reading the designation: the leading 2 marks a spherical roller bearing, the 40 is the ISO 15 dimension series (dimension series 40 (compact OD, maximum width)), and the last two digits encode the 220 mm bore; the 340 mm OD and 118 mm width follow the ISO 15 general plan. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. The 60.0 mm radial section height ((340−220)/2) and 40000 g catalogue mass frame a 220 mm bore bearing rated at 1628 kN C — roughly 7.40 kN of dynamic capacity per millimetre of bore before application factors. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.",
    "applications": [
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems"
    ],
    "pitfalls": [
      "At 220 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 24000-series series at 220 mm bore (340×118 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.",
      "Never use the tapered-bore CCK30/K30 variant's drive-up figures on this cylindrical-bore 24044; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 24044 pits long before its L10 life.",
      "The 1628/2600 kN ratings are SKF catalogue values for this exact execution (24044 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24044 (cylindrical bore as listed, tapered-bore 24044 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24044 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24044?",
        "a": "The 24044 CC/W33 is a double-row spherical roller bearing with 220 mm bore, 340 mm outer diameter and 118 mm width (8.661 × 13.386 × 4.646 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1628 kN, C0 2600 kN, fatigue load limit Pu 212 kN, reference speed 1,200 r/min, limiting speed 1,700 r/min, mass about 40000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 24044 bore code work?",
        "a": "The last two digits of 24044 are bore code 44, so 44 × 5 = 220 mm bore. The 340 mm OD and 118 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 24044?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper."
      },
      {
        "q": "Can 24044 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24044K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24044 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24044",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24044-CCK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AOH24044 withdrawal sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C4044-V",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 4044 V shares the 220×340×118 mm envelope but catalogue C/C0 differ (1930/3250 kN vs 1628/2600 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C4044-K30V",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 4044 K30V shares the 220×340×118 mm envelope but catalogue C/C0 differ (1930/3250 kN vs 1628/2600 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24044",
      "24044 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24048",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24048 CC/W33",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 240,
    "D_mm": 360,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1663,
    "static_load_kN": 2700,
    "fatigue_load_limit_kN": 228,
    "max_rpm": 1600,
    "reference_speed_rpm": 1100,
    "limiting_speed_rpm": 1600,
    "weight_g": 43000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24048 is a double-row spherical roller bearing in the 24000-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. The code breaks down as type digit 2 (double-row spherical roller), dimension series 40 (dimension series 40 (compact OD, maximum width)), and bore code 48 = 240 mm; dimensions 240×360×118 mm therefore match the ISO 15 envelope. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. With C 1663 kN and C0 2700 kN, the 24048 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 24048 CCK30/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.",
    "applications": [
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems"
    ],
    "pitfalls": [
      "At 240 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 24000-series series at 240 mm bore (360×118 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.",
      "The 24048 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 1663/2700 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "Never use the tapered-bore CCK30/K30 variant's drive-up figures on this cylindrical-bore 24048; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 1663/2700 kN ratings are SKF catalogue values for this exact execution (24048 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24048 (cylindrical bore as listed, tapered-bore 24048 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24048 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24048?",
        "a": "The 24048 CC/W33 is a double-row spherical roller bearing with 240 mm bore, 360 mm outer diameter and 118 mm width (9.449 × 14.173 × 4.646 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1663 kN, C0 2700 kN, fatigue load limit Pu 228 kN, reference speed 1,100 r/min, limiting speed 1,600 r/min, mass about 43000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 24048 bore code work?",
        "a": "The last two digits of 24048 are bore code 48, so 48 × 5 = 240 mm bore. The 360 mm OD and 118 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 24048?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper."
      },
      {
        "q": "Can 24048 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24048K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24048 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24048",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24048-CCK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AOH24048 withdrawal sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24048",
      "24048 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24052",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24052 CC/W33",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 260,
    "D_mm": 400,
    "B_mm": 140,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 2135,
    "static_load_kN": 3450,
    "fatigue_load_limit_kN": 285,
    "max_rpm": 1400,
    "reference_speed_rpm": 1000,
    "limiting_speed_rpm": 1400,
    "weight_g": 65500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 260 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 24052 under catalogue execution 24052 CC/W33: two barrel-roller rows on a sphered outer raceway. Reading the designation: the leading 2 marks a spherical roller bearing, the 40 is the ISO 15 dimension series (dimension series 40 (compact OD, maximum width)), and the last two digits encode the 260 mm bore; the 400 mm OD and 140 mm width follow the ISO 15 general plan. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. At 1,000 r/min reference speed the 70.0 mm-section 24052 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 1,400 r/min as the mechanical ceiling. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 24052 CCK30/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.",
    "applications": [
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "wind-turbine main shaft support"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still"
    ],
    "pitfalls": [
      "At 260 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 24000-series series at 260 mm bore (400×140 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.",
      "Never use the tapered-bore CCK30/K30 variant's drive-up figures on this cylindrical-bore 24052; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "Catalogue reference speed and limiting speed are different limits: the 1,000 r/min reference is a thermal criterion under load, while the 1,400 r/min limiting value is the mechanical ceiling — observe both.",
      "The 2135/3450 kN ratings are SKF catalogue values for this exact execution (24052 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24052 (cylindrical bore as listed, tapered-bore 24052 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24052 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24052?",
        "a": "The 24052 CC/W33 is a double-row spherical roller bearing with 260 mm bore, 400 mm outer diameter and 140 mm width (10.236 × 15.748 × 5.512 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2135 kN, C0 3450 kN, fatigue load limit Pu 285 kN, reference speed 1,000 r/min, limiting speed 1,400 r/min, mass about 65500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 24052 bore code work?",
        "a": "The last two digits of 24052 are bore code 52, so 52 × 5 = 260 mm bore. The 400 mm OD and 140 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 24052?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper."
      },
      {
        "q": "Can 24052 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24052K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24052 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24052",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24052-CCK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AOH24052 withdrawal sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24052",
      "24052 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24056",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24056 CC/W33",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 280,
    "D_mm": 420,
    "B_mm": 140,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 2248,
    "static_load_kN": 3800,
    "fatigue_load_limit_kN": 285,
    "max_rpm": 1400,
    "reference_speed_rpm": 950,
    "limiting_speed_rpm": 1400,
    "weight_g": 69500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 24056 CC/W33 is a 280×420×140 mm spherical roller bearing — the dimension series 40 (compact OD, maximum width) entry for a 280 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. The code breaks down as type digit 2 (double-row spherical roller), dimension series 40 (dimension series 40 (compact OD, maximum width)), and bore code 56 = 280 mm; dimensions 280×420×140 mm therefore match the ISO 15 envelope. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Selection arithmetic: the C0/C ratio is about 1.69 (static 3800 kN against dynamic 2248 kN), typical of a spherical roller sized for heavy combined loads, and the 285 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 280 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.",
    "applications": [
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still"
    ],
    "pitfalls": [
      "At 280 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 24000-series series at 280 mm bore (420×140 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.",
      "The 24056 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 2248/3800 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 69500 g mass and 140 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 24056.",
      "The 2248/3800 kN ratings are SKF catalogue values for this exact execution (24056 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24056 (cylindrical bore as listed, tapered-bore 24056 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24056 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24056?",
        "a": "The 24056 CC/W33 is a double-row spherical roller bearing with 280 mm bore, 420 mm outer diameter and 140 mm width (11.024 × 16.535 × 5.512 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2248 kN, C0 3800 kN, fatigue load limit Pu 285 kN, reference speed 950 r/min, limiting speed 1,400 r/min, mass about 69500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 24056 bore code work?",
        "a": "The last two digits of 24056 are bore code 56, so 56 × 5 = 280 mm bore. The 420 mm OD and 140 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 24056?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper."
      },
      {
        "q": "Can 24056 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24056K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24056 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24056",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24056-CCK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AOH24056 withdrawal sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24056",
      "24056 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24060",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24060 CC/W33",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 300,
    "D_mm": 460,
    "B_mm": 160,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 2821,
    "static_load_kN": 4750,
    "fatigue_load_limit_kN": 355,
    "max_rpm": 1200,
    "reference_speed_rpm": 850,
    "limiting_speed_rpm": 1200,
    "weight_g": 97000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF 24060 (24060 CC/W33) is the spherical-roller choice for a 300 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 460×160 mm ISO 15 envelope. Reading the designation: the leading 2 marks a spherical roller bearing, the 40 is the ISO 15 dimension series (dimension series 40 (compact OD, maximum width)), and the last two digits encode the 300 mm bore; the 460 mm OD and 160 mm width follow the ISO 15 general plan. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. With C 2821 kN and C0 4750 kN, the 24060 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 300 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.",
    "applications": [
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At 300 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 24000-series series at 300 mm bore (460×160 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.",
      "Never use the tapered-bore CCK30/K30 variant's drive-up figures on this cylindrical-bore 24060; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 2821/4750 kN ratings are SKF catalogue values for this exact execution (24060 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24060 (cylindrical bore as listed, tapered-bore 24060 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24060 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24060?",
        "a": "The 24060 CC/W33 is a double-row spherical roller bearing with 300 mm bore, 460 mm outer diameter and 160 mm width (11.811 × 18.11 × 6.299 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2821 kN, C0 4750 kN, fatigue load limit Pu 355 kN, reference speed 850 r/min, limiting speed 1,200 r/min, mass about 97000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 24060 bore code work?",
        "a": "The last two digits of 24060 are bore code 60, so 60 × 5 = 300 mm bore. The 460 mm OD and 160 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 24060?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper."
      },
      {
        "q": "Can 24060 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24060K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24060 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24060",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24060-CCK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AOH24060 withdrawal sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C4060-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 4060 M shares the 300×460×160 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C4060-K30M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 4060 K30M shares the 300×460×160 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24060",
      "24060 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24064",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24064 CC/W33",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 320,
    "D_mm": 480,
    "B_mm": 160,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 2969,
    "static_load_kN": 5100,
    "fatigue_load_limit_kN": 400,
    "max_rpm": 1200,
    "reference_speed_rpm": 800,
    "limiting_speed_rpm": 1200,
    "weight_g": 100000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 24064 appears as 24064 CC/W33: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 320×480×160 mm to the ISO 15 boundary plan. The code breaks down as type digit 2 (double-row spherical roller), dimension series 40 (dimension series 40 (compact OD, maximum width)), and bore code 64 = 320 mm; dimensions 320×480×160 mm therefore match the ISO 15 envelope. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Catalogue mass 100000 g for the 320×480×160 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. Mount with the spherical bearing's self-alignment in mind: it compensates ≈ 0.5–2.5° of misalignment depending on series, but the shaft and housing seats still set the datum — a rotating inner ring on a 320 mm shaft typically takes a m6 seat with an H7 housing bore.",
    "applications": [
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At 320 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 24000-series series at 320 mm bore (480×160 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.",
      "The 24064 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 2969/5100 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "Shaft and housing fillets must clear the bearing chamfer so the 160 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 2969/5100 kN ratings are SKF catalogue values for this exact execution (24064 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24064 (cylindrical bore as listed, tapered-bore 24064 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24064 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24064?",
        "a": "The 24064 CC/W33 is a double-row spherical roller bearing with 320 mm bore, 480 mm outer diameter and 160 mm width (12.598 × 18.898 × 6.299 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2969 kN, C0 5100 kN, fatigue load limit Pu 400 kN, reference speed 800 r/min, limiting speed 1,200 r/min, mass about 100000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 24064 bore code work?",
        "a": "The last two digits of 24064 are bore code 64, so 64 × 5 = 320 mm bore. The 480 mm OD and 160 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 24064?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper."
      },
      {
        "q": "Can 24064 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24064K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24064 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24064",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24064-CCK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AOH24064 withdrawal sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24064",
      "24064 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24068",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24068 CC/W33",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 340,
    "D_mm": 520,
    "B_mm": 180,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 3621,
    "static_load_kN": 6200,
    "fatigue_load_limit_kN": 475,
    "max_rpm": 1100,
    "reference_speed_rpm": 750,
    "limiting_speed_rpm": 1100,
    "weight_g": 140000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number 24068 CC/W33 in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 340 mm shaft, dimension series 40 (compact OD, maximum width), with open execution and two pressed-steel cages with a floating guide ring. On the SKF nameplate, 24068 follows the ISO 15 convention: 2 for the spherical roller type, 40 for the dimension series 40 (compact OD, maximum width), final digits 68 for the 340 mm bore. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. The 475 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.71 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. A 340 mm rotating inner ring usually runs m6 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.",
    "applications": [
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At 340 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 24000-series series at 340 mm bore (520×180 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "Catalogue reference speed and limiting speed are different limits: the 750 r/min reference is a thermal criterion under load, while the 1,100 r/min limiting value is the mechanical ceiling — observe both.",
      "The 3621/6200 kN ratings are SKF catalogue values for this exact execution (24068 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24068 (cylindrical bore as listed, tapered-bore 24068 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24068 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24068?",
        "a": "The 24068 CC/W33 is a double-row spherical roller bearing with 340 mm bore, 520 mm outer diameter and 180 mm width (13.386 × 20.472 × 7.087 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 3621 kN, C0 6200 kN, fatigue load limit Pu 475 kN, reference speed 750 r/min, limiting speed 1,100 r/min, mass about 140000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 24068 bore code work?",
        "a": "The last two digits of 24068 are bore code 68, so 68 × 5 = 340 mm bore. The 520 mm OD and 180 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 24068?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper."
      },
      {
        "q": "Can 24068 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24068K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24068 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24068",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24068-CCK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AOH24068 withdrawal sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24068",
      "24068 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24072",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24072 CC/W33",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 360,
    "D_mm": 540,
    "B_mm": 180,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 3705,
    "static_load_kN": 6550,
    "fatigue_load_limit_kN": 490,
    "max_rpm": 1000,
    "reference_speed_rpm": 700,
    "limiting_speed_rpm": 1000,
    "weight_g": 145000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24072 CC/W33 belongs to the SKF spherical roller range — the 360 mm bore entry in the 24000-series series (dimension series 40 (compact OD, maximum width)), dimensioned 540 mm OD and 180 mm wide. The code breaks down as type digit 2 (double-row spherical roller), dimension series 40 (dimension series 40 (compact OD, maximum width)), and bore code 72 = 360 mm; dimensions 360×540×180 mm therefore match the ISO 15 envelope. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Speed planning uses two different ceilings: 700 r/min thermal reference and 1,000 r/min mechanical limiting speed. A 360 mm rotating inner ring usually runs m6 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.",
    "applications": [
      "large mining crusher main shafts",
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 360 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 24000-series series at 360 mm bore (540×180 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.",
      "The 24072 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 3705/6550 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 24072 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 3705/6550 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 3705/6550 kN ratings are SKF catalogue values for this exact execution (24072 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24072 (cylindrical bore as listed, tapered-bore 24072 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24072 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24072?",
        "a": "The 24072 CC/W33 is a double-row spherical roller bearing with 360 mm bore, 540 mm outer diameter and 180 mm width (14.173 × 21.26 × 7.087 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 3705 kN, C0 6550 kN, fatigue load limit Pu 490 kN, reference speed 700 r/min, limiting speed 1,000 r/min, mass about 145000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 24072 bore code work?",
        "a": "The last two digits of 24072 are bore code 72, so 72 × 5 = 360 mm bore. The 540 mm OD and 180 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 24072?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper."
      },
      {
        "q": "Can 24072 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24072K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24072 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24072",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24072-CCK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AOH24072 withdrawal sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24072",
      "24072 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24076",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24076 CC/W33",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 380,
    "D_mm": 560,
    "B_mm": 180,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 3786,
    "static_load_kN": 6800,
    "fatigue_load_limit_kN": 475,
    "max_rpm": 950,
    "reference_speed_rpm": 670,
    "limiting_speed_rpm": 950,
    "weight_g": 150000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24076 is a double-row spherical roller bearing in the 24000-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. On the SKF nameplate, 24076 follows the ISO 15 convention: 2 for the spherical roller type, 40 for the dimension series 40 (compact OD, maximum width), final digits 76 for the 380 mm bore. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. The 90.0 mm radial section height ((560−380)/2) and 150000 g catalogue mass frame a 380 mm bore bearing rated at 3786 kN C — roughly 9.96 kN of dynamic capacity per millimetre of bore before application factors. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 180 mm width across two roller rows needs the full charge.",
    "applications": [
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 380 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 24000-series series at 380 mm bore (560×180 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 3786/6800 kN ratings are SKF catalogue values for this exact execution (24076 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24076 (cylindrical bore as listed, tapered-bore 24076 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24076 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24076?",
        "a": "The 24076 CC/W33 is a double-row spherical roller bearing with 380 mm bore, 560 mm outer diameter and 180 mm width (14.961 × 22.047 × 7.087 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 3786 kN, C0 6800 kN, fatigue load limit Pu 475 kN, reference speed 670 r/min, limiting speed 950 r/min, mass about 150000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 24076 bore code work?",
        "a": "The last two digits of 24076 are bore code 76, so 76 × 5 = 380 mm bore. The 560 mm OD and 180 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 24076?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper."
      },
      {
        "q": "Can 24076 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24076K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24076 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24076",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24076-CCK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AOH24076 withdrawal sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24076",
      "24076 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24080",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24080 ECCJ/W33",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 400,
    "D_mm": 600,
    "B_mm": 200,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 4507,
    "static_load_kN": 8000,
    "fatigue_load_limit_kN": 560,
    "max_rpm": 900,
    "reference_speed_rpm": 630,
    "limiting_speed_rpm": 900,
    "weight_g": 205000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 400 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 24080 under catalogue execution 24080 ECCJ/W33: two barrel-roller rows on a sphered outer raceway. The code breaks down as type digit 2 (double-row spherical roller), dimension series 40 (dimension series 40 (compact OD, maximum width)), and bore code 80 = 400 mm; dimensions 400×600×200 mm therefore match the ISO 15 envelope. CJ/ECCJ bearings here run a stamped steel window cage rather than the older two-cage CC arrangement; quote the full ECCJ/W33 designation when ordering, and do not assume the K tapered-bore execution is a field conversion. The 560 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.78 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 200 mm width across two roller rows needs the full charge.",
    "applications": [
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems"
    ],
    "pitfalls": [
      "At 400 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 24000-series series at 400 mm bore (600×200 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.",
      "The 24080 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 4507/8000 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 24080 pits long before its L10 life.",
      "The 4507/8000 kN ratings are SKF catalogue values for this exact execution (24080 ECCJ/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24080 (cylindrical bore as listed, tapered-bore 24080 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24080 ECCJ/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24080?",
        "a": "The 24080 ECCJ/W33 is a double-row spherical roller bearing with 400 mm bore, 600 mm outer diameter and 200 mm width (15.748 × 23.622 × 7.874 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 4507 kN, C0 8000 kN, fatigue load limit Pu 560 kN, reference speed 630 r/min, limiting speed 900 r/min, mass about 205000 g. It is an open, self-aligning bearing with a stamped sheet-steel window-type cage with low-friction guidance (CJ design)."
      },
      {
        "q": "How does the 24080 bore code work?",
        "a": "The last two digits of 24080 are bore code 80, so 80 × 5 = 400 mm bore. The 600 mm OD and 200 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the ECCJ/W33 suffix mean on 24080?",
        "a": "The suffix ECCJ/W33 reads ECCJ — the optimized, higher-capacity version of the CJ design, with a stamped sheet-steel window-type cage with low-friction guidance, plus W33 (outer-ring groove and three lubrication holes); CCK30/W33 is the 1:30 tapered-bore counterpart."
      },
      {
        "q": "Can 24080 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24080K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24080 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24080",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24080-ECCK30J-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AOH24080 withdrawal sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24080",
      "24080 ECCJ/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24084",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24084 ECA/W33",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 420,
    "D_mm": 620,
    "B_mm": 200,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 4610,
    "static_load_kN": 8300,
    "fatigue_load_limit_kN": 585,
    "max_rpm": 900,
    "reference_speed_rpm": 530,
    "limiting_speed_rpm": 900,
    "weight_g": 210000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 24084 ECA/W33 is a 420×620×200 mm spherical roller bearing — the dimension series 40 (compact OD, maximum width) entry for a 420 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. On the SKF nameplate, 24084 follows the ISO 15 convention: 2 for the spherical roller type, 40 for the dimension series 40 (compact OD, maximum width), final digits 84 for the 420 mm bore. CA executions here use a machined brass cage (ECA enhanced geometry) rather than pressed steel; specialist suffixes change the bearing materially and must be quoted in full, and the K/CCK tapered-bore variant is a separate order number. At 530 r/min reference speed the 100.0 mm-section 24084 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 900 r/min as the mechanical ceiling. After mounting, swing the outer ring to confirm free self-alignment: the 24084 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.",
    "applications": [
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "wind-turbine main shaft support"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems"
    ],
    "pitfalls": [
      "At 420 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 24000-series series at 420 mm bore (620×200 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "Never use the tapered-bore CCK30/K30 variant's drive-up figures on this cylindrical-bore 24084; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 4610/8300 kN ratings are SKF catalogue values for this exact execution (24084 ECA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24084 (cylindrical bore as listed, tapered-bore 24084 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24084 ECA/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24084?",
        "a": "The 24084 ECA/W33 is a double-row spherical roller bearing with 420 mm bore, 620 mm outer diameter and 200 mm width (16.535 × 24.409 × 7.874 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 4610 kN, C0 8300 kN, fatigue load limit Pu 585 kN, reference speed 530 r/min, limiting speed 900 r/min, mass about 210000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)."
      },
      {
        "q": "How does the 24084 bore code work?",
        "a": "The last two digits of 24084 are bore code 84, so 84 × 5 = 420 mm bore. The 620 mm OD and 200 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the ECA/W33 suffix mean on 24084?",
        "a": "The suffix ECA/W33 reads ECA — the enhanced version of the CA design with optimized internal geometry, plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK30/W33 is the 1:30 tapered-bore counterpart."
      },
      {
        "q": "Can 24084 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24084K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24084 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24084",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24084-ECAK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AOH24084 withdrawal sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24084",
      "24084 ECA/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24088",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24088 ECA/W33",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 440,
    "D_mm": 650,
    "B_mm": 212,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 4987,
    "static_load_kN": 9150,
    "fatigue_load_limit_kN": 630,
    "max_rpm": 850,
    "reference_speed_rpm": 500,
    "limiting_speed_rpm": 850,
    "weight_g": 245000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF 24088 (24088 ECA/W33) is the spherical-roller choice for a 440 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 650×212 mm ISO 15 envelope. Numbering ties the bearing to its envelope: 24088 means spherical-roller type, dimension series 40, 440 mm bore — which is why the 650×212 mm outline swaps dimensionally with other ISO 15 bearings of the same code. CA executions here use a machined brass cage (ECA enhanced geometry) rather than pressed steel; specialist suffixes change the bearing materially and must be quoted in full, and the K/CCK tapered-bore variant is a separate order number. Selection arithmetic: the C0/C ratio is about 1.83 (static 9150 kN against dynamic 4987 kN), typical of a spherical roller sized for heavy combined loads, and the 630 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.",
    "applications": [
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems"
    ],
    "pitfalls": [
      "At 440 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 24000-series series at 440 mm bore (650×212 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.",
      "Shaft and housing fillets must clear the bearing chamfer so the 212 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 24088 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 4987/9150 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 4987/9150 kN ratings are SKF catalogue values for this exact execution (24088 ECA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24088 (cylindrical bore as listed, tapered-bore 24088 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24088 ECA/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24088?",
        "a": "The 24088 ECA/W33 is a double-row spherical roller bearing with 440 mm bore, 650 mm outer diameter and 212 mm width (17.323 × 25.591 × 8.346 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 4987 kN, C0 9150 kN, fatigue load limit Pu 630 kN, reference speed 500 r/min, limiting speed 850 r/min, mass about 245000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)."
      },
      {
        "q": "How does the 24088 bore code work?",
        "a": "The last two digits of 24088 are bore code 88, so 88 × 5 = 440 mm bore. The 650 mm OD and 212 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the ECA/W33 suffix mean on 24088?",
        "a": "The suffix ECA/W33 reads ECA — the enhanced version of the CA design with optimized internal geometry, plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK30/W33 is the 1:30 tapered-bore counterpart."
      },
      {
        "q": "Can 24088 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24088K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24088 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24088",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24088-ECAK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AOH24088 withdrawal sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24088",
      "24088 ECA/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24092",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24092 ECA/W33",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 460,
    "D_mm": 680,
    "B_mm": 218,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 5401,
    "static_load_kN": 10000,
    "fatigue_load_limit_kN": 670,
    "max_rpm": 800,
    "reference_speed_rpm": 480,
    "limiting_speed_rpm": 800,
    "weight_g": 275000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 24092 appears as 24092 ECA/W33: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 460×680×218 mm to the ISO 15 boundary plan. On the SKF nameplate, 24092 follows the ISO 15 convention: 2 for the spherical roller type, 40 for the dimension series 40 (compact OD, maximum width), final digits 92 for the 460 mm bore. CA executions here use a machined brass cage (ECA enhanced geometry) rather than pressed steel; specialist suffixes change the bearing materially and must be quoted in full, and the K/CCK tapered-bore variant is a separate order number. With C 5401 kN and C0 10000 kN, the 24092 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.",
    "applications": [
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still"
    ],
    "pitfalls": [
      "At 460 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 24000-series series at 460 mm bore (680×218 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 275000 g mass and 218 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 24092.",
      "The 5401/10000 kN ratings are SKF catalogue values for this exact execution (24092 ECA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24092 (cylindrical bore as listed, tapered-bore 24092 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24092 ECA/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24092?",
        "a": "The 24092 ECA/W33 is a double-row spherical roller bearing with 460 mm bore, 680 mm outer diameter and 218 mm width (18.11 × 26.772 × 8.583 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 5401 kN, C0 10000 kN, fatigue load limit Pu 670 kN, reference speed 480 r/min, limiting speed 800 r/min, mass about 275000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)."
      },
      {
        "q": "How does the 24092 bore code work?",
        "a": "The last two digits of 24092 are bore code 92, so 92 × 5 = 460 mm bore. The 680 mm OD and 218 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the ECA/W33 suffix mean on 24092?",
        "a": "The suffix ECA/W33 reads ECA — the enhanced version of the CA design with optimized internal geometry, plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK30/W33 is the 1:30 tapered-bore counterpart."
      },
      {
        "q": "Can 24092 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24092K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24092 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24092",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24092-ECAK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AOH24092 withdrawal sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24092",
      "24092 ECA/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24096",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24096 ECA/W33",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 480,
    "D_mm": 700,
    "B_mm": 218,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 5524,
    "static_load_kN": 10400,
    "fatigue_load_limit_kN": 695,
    "max_rpm": 750,
    "reference_speed_rpm": 450,
    "limiting_speed_rpm": 750,
    "weight_g": 285000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number 24096 ECA/W33 in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 480 mm shaft, dimension series 40 (compact OD, maximum width), with open execution and a one-piece machined brass cage guided on the inner ring (CA design). Numbering ties the bearing to its envelope: 24096 means spherical-roller type, dimension series 40, 480 mm bore — which is why the 700×218 mm outline swaps dimensionally with other ISO 15 bearings of the same code. CA executions here use a machined brass cage (ECA enhanced geometry) rather than pressed steel; specialist suffixes change the bearing materially and must be quoted in full, and the K/CCK tapered-bore variant is a separate order number. Catalogue mass 285000 g for the 480×700×218 mm open execution covers the a one-piece machined brass cage guided on the inner ring (CA design); tapered-bore and sealed variants differ in mass and carry their own order numbers. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 24096 CCK30/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.",
    "applications": [
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still"
    ],
    "pitfalls": [
      "At 480 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 24000-series series at 480 mm bore (700×218 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.",
      "Shaft and housing fillets must clear the bearing chamfer so the 218 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 24096 pits long before its L10 life.",
      "The 5524/10400 kN ratings are SKF catalogue values for this exact execution (24096 ECA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24096 (cylindrical bore as listed, tapered-bore 24096 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24096 ECA/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24096?",
        "a": "The 24096 ECA/W33 is a double-row spherical roller bearing with 480 mm bore, 700 mm outer diameter and 218 mm width (18.898 × 27.559 × 8.583 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 5524 kN, C0 10400 kN, fatigue load limit Pu 695 kN, reference speed 450 r/min, limiting speed 750 r/min, mass about 285000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)."
      },
      {
        "q": "How does the 24096 bore code work?",
        "a": "The last two digits of 24096 are bore code 96, so 96 × 5 = 480 mm bore. The 700 mm OD and 218 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the ECA/W33 suffix mean on 24096?",
        "a": "The suffix ECA/W33 reads ECA — the enhanced version of the CA design with optimized internal geometry, plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK30/W33 is the 1:30 tapered-bore counterpart."
      },
      {
        "q": "Can 24096 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24096K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24096 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24096",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24096-ECAK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AOH24096 withdrawal sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24096",
      "24096 ECA/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24120",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24120 CC/W33",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 100,
    "D_mm": 165,
    "B_mm": 65,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 468,
    "static_load_kN": 640,
    "fatigue_load_limit_kN": 68,
    "max_rpm": 3200,
    "reference_speed_rpm": 2400,
    "limiting_speed_rpm": 3200,
    "weight_g": 5650,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 24120 appears as 24120 CC/W33: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 100×165×65 mm to the ISO 15 boundary plan. Digit by digit, 24120 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 41, and bore reference 20 resolving to 100 mm; 165 mm OD and 65 mm width are the matching ISO 15 boundary values. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. The 68 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.37 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. Mount with the spherical bearing's self-alignment in mind: it compensates ≈ 0.5–2.5° of misalignment depending on series, but the shaft and housing seats still set the datum — a rotating inner ring on a 100 mm shaft typically takes a k5 seat with an H7 housing bore.",
    "applications": [
      "cement-mill trunnion and drive shafts",
      "heavy conveyor head shafts in mining",
      "jaw and cone crusher main shafts",
      "paper-machine press and dryer rolls"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still"
    ],
    "pitfalls": [
      "Mount the 100 mm bore 24120 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 24100-series series at 100 mm bore (165×65 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 3,200 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 24120 pits long before its L10 life.",
      "Shaft and housing fillets must clear the bearing chamfer so the 65 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 468/640 kN ratings are SKF catalogue values for this exact execution (24120 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24120 (cylindrical bore as listed, tapered-bore 24120 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24120 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24120?",
        "a": "The 24120 CC/W33 is a double-row spherical roller bearing with 100 mm bore, 165 mm outer diameter and 65 mm width (3.937 × 6.496 × 2.559 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 468 kN, C0 640 kN, fatigue load limit Pu 68 kN, reference speed 2,400 r/min, limiting speed 3,200 r/min, mass about 5650 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 24120 bore code work?",
        "a": "The last two digits of 24120 are bore code 20, so 20 × 5 = 100 mm bore. The 165 mm OD and 65 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 24120?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper."
      },
      {
        "q": "Can 24120 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24120K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24120 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24120",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "C4120-2CS5V-GEM9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 4120-2CS5V/GEM9 shares the 100×165×65 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C4120-V-VE240",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 4120 V/VE240 shares the 100×165×65 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24120",
      "24120 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24122",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24122 CC/W33",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 180,
    "B_mm": 69,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 539,
    "static_load_kN": 750,
    "fatigue_load_limit_kN": 78,
    "max_rpm": 3000,
    "reference_speed_rpm": 2000,
    "limiting_speed_rpm": 3000,
    "weight_g": 7100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 110 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 24122 under catalogue execution 24122 CC/W33: two barrel-roller rows on a sphered outer raceway. On the SKF nameplate, 24122 follows the ISO 15 convention: 2 for the spherical roller type, 41 for the dimension series 41 (medium OD, maximum width), final digits 22 for the 110 mm bore. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. The 35.0 mm radial section height ((180−110)/2) and 7100 g catalogue mass frame a 110 mm bore bearing rated at 539 kN C — roughly 4.90 kN of dynamic capacity per millimetre of bore before application factors. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.",
    "applications": [
      "rolling-mill pinion and back-up shafts",
      "large vibrating screens and feeders",
      "marine propulsion and thruster shafts",
      "cement-mill trunnion and drive shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Mount the 110 mm bore 24122 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 24100-series series at 110 mm bore (180×69 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 3,000 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.",
      "Shaft and housing fillets must clear the bearing chamfer so the 69 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "Never use the tapered-bore CCK30/K30 variant's drive-up figures on this cylindrical-bore 24122; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 539/750 kN ratings are SKF catalogue values for this exact execution (24122 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24122 (cylindrical bore as listed, tapered-bore 24122 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24122 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24122?",
        "a": "The 24122 CC/W33 is a double-row spherical roller bearing with 110 mm bore, 180 mm outer diameter and 69 mm width (4.331 × 7.087 × 2.717 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 539 kN, C0 750 kN, fatigue load limit Pu 78 kN, reference speed 2,000 r/min, limiting speed 3,000 r/min, mass about 7100 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 24122 bore code work?",
        "a": "The last two digits of 24122 are bore code 22, so 22 × 5 = 110 mm bore. The 180 mm OD and 69 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 24122?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper."
      },
      {
        "q": "Can 24122 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24122K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24122 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24122",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24122-CCK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AH24122 withdrawal sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C4122-2CS5V-GEM9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 4122-2CS5V/GEM9 shares the 110×180×69 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C4122-V",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 4122 V shares the 110×180×69 mm envelope but catalogue C/C0 differ (670/1000 kN vs 539/750 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24122",
      "24122 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24124",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24124 CC/W33",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 200,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 679,
    "static_load_kN": 950,
    "fatigue_load_limit_kN": 95,
    "max_rpm": 2600,
    "reference_speed_rpm": 1900,
    "limiting_speed_rpm": 2600,
    "weight_g": 10500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number 24124 CC/W33 in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 120 mm shaft, dimension series 41 (medium OD, maximum width), with open execution and two pressed-steel cages with a floating guide ring. Reading the designation: the leading 2 marks a spherical roller bearing, the 41 is the ISO 15 dimension series (dimension series 41 (medium OD, maximum width)), and the last two digits encode the 120 mm bore; the 200 mm OD and 80 mm width follow the ISO 15 general plan. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. At 1,900 r/min reference speed the 40.0 mm-section 24124 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 2,600 r/min as the mechanical ceiling. A 120 mm rotating inner ring usually runs m6 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.",
    "applications": [
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "wind-turbine main shaft support"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still"
    ],
    "pitfalls": [
      "At 120 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 24100-series series at 120 mm bore (200×80 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 2,600 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.",
      "Never use the tapered-bore CCK30/K30 variant's drive-up figures on this cylindrical-bore 24124; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "Catalogue reference speed and limiting speed are different limits: the 1,900 r/min reference is a thermal criterion under load, while the 2,600 r/min limiting value is the mechanical ceiling — observe both.",
      "The 679/950 kN ratings are SKF catalogue values for this exact execution (24124 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24124 (cylindrical bore as listed, tapered-bore 24124 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24124 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24124?",
        "a": "The 24124 CC/W33 is a double-row spherical roller bearing with 120 mm bore, 200 mm outer diameter and 80 mm width (4.724 × 7.874 × 3.15 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 679 kN, C0 950 kN, fatigue load limit Pu 95 kN, reference speed 1,900 r/min, limiting speed 2,600 r/min, mass about 10500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 24124 bore code work?",
        "a": "The last two digits of 24124 are bore code 24, so 24 × 5 = 120 mm bore. The 200 mm OD and 80 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 24124?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper."
      },
      {
        "q": "Can 24124 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24124K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24124 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24124",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24124-CCK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AH24124 withdrawal sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C4124-V",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 4124 V shares the 120×200×80 mm envelope but catalogue C/C0 differ (780/1120 kN vs 679/950 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24124",
      "24124 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24126",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24126 CC/W33",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 210,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 699,
    "static_load_kN": 1000,
    "fatigue_load_limit_kN": 100,
    "max_rpm": 2400,
    "reference_speed_rpm": 1700,
    "limiting_speed_rpm": 2400,
    "weight_g": 11000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 24126 CC/W33 is a 130×210×80 mm spherical roller bearing — the dimension series 41 (medium OD, maximum width) entry for a 130 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. Numbering ties the bearing to its envelope: 24126 means spherical-roller type, dimension series 41, 130 mm bore — which is why the 210×80 mm outline swaps dimensionally with other ISO 15 bearings of the same code. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. With C 699 kN and C0 1000 kN, the 24126 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 24126 CCK30/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.",
    "applications": [
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 130 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 24100-series series at 130 mm bore (210×80 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 2,400 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.",
      "Catalogue reference speed and limiting speed are different limits: the 1,700 r/min reference is a thermal criterion under load, while the 2,400 r/min limiting value is the mechanical ceiling — observe both.",
      "The 24126 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 699/1000 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 699/1000 kN ratings are SKF catalogue values for this exact execution (24126 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24126 (cylindrical bore as listed, tapered-bore 24126 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24126 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24126?",
        "a": "The 24126 CC/W33 is a double-row spherical roller bearing with 130 mm bore, 210 mm outer diameter and 80 mm width (5.118 × 8.268 × 3.15 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 699 kN, C0 1000 kN, fatigue load limit Pu 100 kN, reference speed 1,700 r/min, limiting speed 2,400 r/min, mass about 11000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 24126 bore code work?",
        "a": "The last two digits of 24126 are bore code 26, so 26 × 5 = 130 mm bore. The 210 mm OD and 80 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 24126?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper."
      },
      {
        "q": "Can 24126 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24126K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24126 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24126",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24126-CCK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AH24126 withdrawal sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C4126-2CS5V-GEM9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 4126-2CS5V/GEM9 shares the 130×210×80 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24126",
      "24126 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24128",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24128 CC/W33",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 225,
    "B_mm": 85,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 796,
    "static_load_kN": 1160,
    "fatigue_load_limit_kN": 112,
    "max_rpm": 2200,
    "reference_speed_rpm": 1600,
    "limiting_speed_rpm": 2200,
    "weight_g": 13500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24128 CC/W33 belongs to the SKF spherical roller range — the 140 mm bore entry in the 24100-series series (dimension series 41 (medium OD, maximum width)), dimensioned 225 mm OD and 85 mm wide. The code breaks down as type digit 2 (double-row spherical roller), dimension series 41 (dimension series 41 (medium OD, maximum width)), and bore code 28 = 140 mm; dimensions 140×225×85 mm therefore match the ISO 15 envelope. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Selection arithmetic: the C0/C ratio is about 1.46 (static 1160 kN against dynamic 796 kN), typical of a spherical roller sized for heavy combined loads, and the 112 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 85 mm width across two roller rows needs the full charge.",
    "applications": [
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still"
    ],
    "pitfalls": [
      "At 140 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 24100-series series at 140 mm bore (225×85 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 2,200 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.",
      "The 24128 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 796/1160 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 13500 g mass and 85 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 24128.",
      "The 796/1160 kN ratings are SKF catalogue values for this exact execution (24128 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24128 (cylindrical bore as listed, tapered-bore 24128 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24128 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24128?",
        "a": "The 24128 CC/W33 is a double-row spherical roller bearing with 140 mm bore, 225 mm outer diameter and 85 mm width (5.512 × 8.858 × 3.346 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 796 kN, C0 1160 kN, fatigue load limit Pu 112 kN, reference speed 1,600 r/min, limiting speed 2,200 r/min, mass about 13500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 24128 bore code work?",
        "a": "The last two digits of 24128 are bore code 28, so 28 × 5 = 140 mm bore. The 225 mm OD and 85 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 24128?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper."
      },
      {
        "q": "Can 24128 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24128K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24128 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24128",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24128-CCK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AH24128 withdrawal sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C4128-2CS5V-GEM9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 4128-2CS5V/GEM9 shares the 140×225×85 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C4128-V-VE240",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 4128 V/VE240 shares the 140×225×85 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24128",
      "24128 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24130",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24130 CC/W33",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 250,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1054,
    "static_load_kN": 1530,
    "fatigue_load_limit_kN": 146,
    "max_rpm": 2000,
    "reference_speed_rpm": 1400,
    "limiting_speed_rpm": 2000,
    "weight_g": 20000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF 24130 (24130 CC/W33) is the spherical-roller choice for a 150 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 250×100 mm ISO 15 envelope. On the SKF nameplate, 24130 follows the ISO 15 convention: 2 for the spherical roller type, 41 for the dimension series 41 (medium OD, maximum width), final digits 30 for the 150 mm bore. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. At 1,400 r/min reference speed the 50.0 mm-section 24130 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 2,000 r/min as the mechanical ceiling. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 24130 CCK30/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.",
    "applications": [
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "wind-turbine main shaft support"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems"
    ],
    "pitfalls": [
      "At 150 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 24100-series series at 150 mm bore (250×100 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 2,000 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.",
      "Shaft and housing fillets must clear the bearing chamfer so the 100 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 20000 g mass and 100 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 24130.",
      "The 1054/1530 kN ratings are SKF catalogue values for this exact execution (24130 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24130 (cylindrical bore as listed, tapered-bore 24130 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24130 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24130?",
        "a": "The 24130 CC/W33 is a double-row spherical roller bearing with 150 mm bore, 250 mm outer diameter and 100 mm width (5.906 × 9.843 × 3.937 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1054 kN, C0 1530 kN, fatigue load limit Pu 146 kN, reference speed 1,400 r/min, limiting speed 2,000 r/min, mass about 20000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 24130 bore code work?",
        "a": "The last two digits of 24130 are bore code 30, so 30 × 5 = 150 mm bore. The 250 mm OD and 100 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 24130?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper."
      },
      {
        "q": "Can 24130 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24130K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24130 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24130",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24130-CCK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AH24130 withdrawal sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C4130-V",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 4130 V shares the 150×250×100 mm envelope but catalogue C/C0 differ (1220/1860 kN vs 1054/1530 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24130",
      "24130 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24132",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24132 CC/W33",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 270,
    "B_mm": 109,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1227,
    "static_load_kN": 1760,
    "fatigue_load_limit_kN": 163,
    "max_rpm": 1900,
    "reference_speed_rpm": 1300,
    "limiting_speed_rpm": 1900,
    "weight_g": 25000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24132 is a double-row spherical roller bearing in the 24100-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. Reading the designation: the leading 2 marks a spherical roller bearing, the 41 is the ISO 15 dimension series (dimension series 41 (medium OD, maximum width)), and the last two digits encode the 160 mm bore; the 270 mm OD and 109 mm width follow the ISO 15 general plan. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. With C 1227 kN and C0 1760 kN, the 24132 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 109 mm width across two roller rows needs the full charge.",
    "applications": [
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At 160 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 24100-series series at 160 mm bore (270×109 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 1,900 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.",
      "Never use the tapered-bore CCK30/K30 variant's drive-up figures on this cylindrical-bore 24132; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 1227/1760 kN ratings are SKF catalogue values for this exact execution (24132 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24132 (cylindrical bore as listed, tapered-bore 24132 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24132 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24132?",
        "a": "The 24132 CC/W33 is a double-row spherical roller bearing with 160 mm bore, 270 mm outer diameter and 109 mm width (6.299 × 10.63 × 4.291 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1227 kN, C0 1760 kN, fatigue load limit Pu 163 kN, reference speed 1,300 r/min, limiting speed 1,900 r/min, mass about 25000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 24132 bore code work?",
        "a": "The last two digits of 24132 are bore code 32, so 32 × 5 = 160 mm bore. The 270 mm OD and 109 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 24132?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper."
      },
      {
        "q": "Can 24132 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24132K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24132 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24132",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24132-CCK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AH24132 withdrawal sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24132",
      "24132 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24134",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24134 CC/W33",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 280,
    "B_mm": 109,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1270,
    "static_load_kN": 1860,
    "fatigue_load_limit_kN": 170,
    "max_rpm": 1800,
    "reference_speed_rpm": 1200,
    "limiting_speed_rpm": 1800,
    "weight_g": 27500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 24134 appears as 24134 CC/W33: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 170×280×109 mm to the ISO 15 boundary plan. Numbering ties the bearing to its envelope: 24134 means spherical-roller type, dimension series 41, 170 mm bore — which is why the 280×109 mm outline swaps dimensionally with other ISO 15 bearings of the same code. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Selection arithmetic: the C0/C ratio is about 1.46 (static 1860 kN against dynamic 1270 kN), typical of a spherical roller sized for heavy combined loads, and the 170 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 170 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.",
    "applications": [
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems"
    ],
    "pitfalls": [
      "At 170 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 24100-series series at 170 mm bore (280×109 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 1,800 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.",
      "Catalogue reference speed and limiting speed are different limits: the 1,200 r/min reference is a thermal criterion under load, while the 1,800 r/min limiting value is the mechanical ceiling — observe both.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 24134 pits long before its L10 life.",
      "The 1270/1860 kN ratings are SKF catalogue values for this exact execution (24134 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24134 (cylindrical bore as listed, tapered-bore 24134 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24134 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24134?",
        "a": "The 24134 CC/W33 is a double-row spherical roller bearing with 170 mm bore, 280 mm outer diameter and 109 mm width (6.693 × 11.024 × 4.291 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1270 kN, C0 1860 kN, fatigue load limit Pu 170 kN, reference speed 1,200 r/min, limiting speed 1,800 r/min, mass about 27500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 24134 bore code work?",
        "a": "The last two digits of 24134 are bore code 34, so 34 × 5 = 170 mm bore. The 280 mm OD and 109 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 24134?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper."
      },
      {
        "q": "Can 24134 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24134K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24134 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24134",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24134-CCK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AH24134 withdrawal sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24134",
      "24134 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24136",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24136 CC/W33",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 300,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1449,
    "static_load_kN": 2160,
    "fatigue_load_limit_kN": 196,
    "max_rpm": 1600,
    "reference_speed_rpm": 1100,
    "limiting_speed_rpm": 1600,
    "weight_g": 34500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 180 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 24136 under catalogue execution 24136 CC/W33: two barrel-roller rows on a sphered outer raceway. The code breaks down as type digit 2 (double-row spherical roller), dimension series 41 (dimension series 41 (medium OD, maximum width)), and bore code 36 = 180 mm; dimensions 180×300×118 mm therefore match the ISO 15 envelope. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Catalogue mass 34500 g for the 180×300×118 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. After mounting, swing the outer ring to confirm free self-alignment: the 24136 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.",
    "applications": [
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At 180 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 24100-series series at 180 mm bore (300×118 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 1,600 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.",
      "The 24136 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 1449/2160 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "Shaft and housing fillets must clear the bearing chamfer so the 118 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 1449/2160 kN ratings are SKF catalogue values for this exact execution (24136 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24136 (cylindrical bore as listed, tapered-bore 24136 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24136 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24136?",
        "a": "The 24136 CC/W33 is a double-row spherical roller bearing with 180 mm bore, 300 mm outer diameter and 118 mm width (7.087 × 11.811 × 4.646 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1449 kN, C0 2160 kN, fatigue load limit Pu 196 kN, reference speed 1,100 r/min, limiting speed 1,600 r/min, mass about 34500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 24136 bore code work?",
        "a": "The last two digits of 24136 are bore code 36, so 36 × 5 = 180 mm bore. The 300 mm OD and 118 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 24136?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper."
      },
      {
        "q": "Can 24136 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24136K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24136 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24136",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24136-CCK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AH24136 withdrawal sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C4136-V",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 4136 V shares the 180×300×118 mm envelope but catalogue C/C0 differ (1760/2700 kN vs 1449/2160 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24136",
      "24136 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24138",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24138 CC/W33",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 190,
    "D_mm": 320,
    "B_mm": 128,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1652,
    "static_load_kN": 2500,
    "fatigue_load_limit_kN": 212,
    "max_rpm": 1500,
    "reference_speed_rpm": 1100,
    "limiting_speed_rpm": 1500,
    "weight_g": 43000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number 24138 CC/W33 in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 190 mm shaft, dimension series 41 (medium OD, maximum width), with open execution and two pressed-steel cages with a floating guide ring. Digit by digit, 24138 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 41, and bore reference 38 resolving to 190 mm; 320 mm OD and 128 mm width are the matching ISO 15 boundary values. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Speed planning uses two different ceilings: 1,100 r/min thermal reference and 1,500 r/min mechanical limiting speed. Mount with the spherical bearing's self-alignment in mind: it compensates ≈ 0.5–2.5° of misalignment depending on series, but the shaft and housing seats still set the datum — a rotating inner ring on a 190 mm shaft typically takes a m6 seat with an H7 housing bore.",
    "applications": [
      "large mining crusher main shafts",
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems"
    ],
    "pitfalls": [
      "At 190 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 24100-series series at 190 mm bore (320×128 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 1,500 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.",
      "The 43000 g mass and 128 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 24138.",
      "Never use the tapered-bore CCK30/K30 variant's drive-up figures on this cylindrical-bore 24138; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 1652/2500 kN ratings are SKF catalogue values for this exact execution (24138 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24138 (cylindrical bore as listed, tapered-bore 24138 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24138 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24138?",
        "a": "The 24138 CC/W33 is a double-row spherical roller bearing with 190 mm bore, 320 mm outer diameter and 128 mm width (7.48 × 12.598 × 5.039 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1652 kN, C0 2500 kN, fatigue load limit Pu 212 kN, reference speed 1,100 r/min, limiting speed 1,500 r/min, mass about 43000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 24138 bore code work?",
        "a": "The last two digits of 24138 are bore code 38, so 38 × 5 = 190 mm bore. The 320 mm OD and 128 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 24138?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper."
      },
      {
        "q": "Can 24138 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24138K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24138 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24138",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24138-CCK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AH24138 withdrawal sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24138",
      "24138 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24140",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24140 CC/W33",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 200,
    "D_mm": 340,
    "B_mm": 140,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1865,
    "static_load_kN": 2800,
    "fatigue_load_limit_kN": 232,
    "max_rpm": 1400,
    "reference_speed_rpm": 1000,
    "limiting_speed_rpm": 1400,
    "weight_g": 53500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 24140 CC/W33 is a 200×340×140 mm spherical roller bearing — the dimension series 41 (medium OD, maximum width) entry for a 200 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. Reading the designation: the leading 2 marks a spherical roller bearing, the 41 is the ISO 15 dimension series (dimension series 41 (medium OD, maximum width)), and the last two digits encode the 200 mm bore; the 340 mm OD and 140 mm width follow the ISO 15 general plan. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Selection arithmetic: the C0/C ratio is about 1.50 (static 2800 kN against dynamic 1865 kN), typical of a spherical roller sized for heavy combined loads, and the 232 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. After mounting, swing the outer ring to confirm free self-alignment: the 24140 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.",
    "applications": [
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 200 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 24100-series series at 200 mm bore (340×140 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 1,400 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.",
      "Never use the tapered-bore CCK30/K30 variant's drive-up figures on this cylindrical-bore 24140; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "Never use the tapered-bore CCK30/K30 variant's drive-up figures on this cylindrical-bore 24140; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 1865/2800 kN ratings are SKF catalogue values for this exact execution (24140 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24140 (cylindrical bore as listed, tapered-bore 24140 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24140 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24140?",
        "a": "The 24140 CC/W33 is a double-row spherical roller bearing with 200 mm bore, 340 mm outer diameter and 140 mm width (7.874 × 13.386 × 5.512 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1865 kN, C0 2800 kN, fatigue load limit Pu 232 kN, reference speed 1,000 r/min, limiting speed 1,400 r/min, mass about 53500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 24140 bore code work?",
        "a": "The last two digits of 24140 are bore code 40, so 40 × 5 = 200 mm bore. The 340 mm OD and 140 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 24140?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper."
      },
      {
        "q": "Can 24140 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24140K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24140 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24140",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24140-CCK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AH24140 withdrawal sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24140",
      "24140 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24144",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24144 CC/W33",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 220,
    "D_mm": 370,
    "B_mm": 150,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 2197,
    "static_load_kN": 3350,
    "fatigue_load_limit_kN": 285,
    "max_rpm": 1200,
    "reference_speed_rpm": 850,
    "limiting_speed_rpm": 1200,
    "weight_g": 67000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF 24144 (24144 CC/W33) is the spherical-roller choice for a 220 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 370×150 mm ISO 15 envelope. The code breaks down as type digit 2 (double-row spherical roller), dimension series 41 (dimension series 41 (medium OD, maximum width)), and bore code 44 = 220 mm; dimensions 220×370×150 mm therefore match the ISO 15 envelope. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Speed planning uses two different ceilings: 850 r/min thermal reference and 1,200 r/min mechanical limiting speed. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.",
    "applications": [
      "large mining crusher main shafts",
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 220 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 24100-series series at 220 mm bore (370×150 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 1,200 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.",
      "The 24144 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 2197/3350 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 24144 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 2197/3350 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 2197/3350 kN ratings are SKF catalogue values for this exact execution (24144 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24144 (cylindrical bore as listed, tapered-bore 24144 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24144 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24144?",
        "a": "The 24144 CC/W33 is a double-row spherical roller bearing with 220 mm bore, 370 mm outer diameter and 150 mm width (8.661 × 14.567 × 5.906 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2197 kN, C0 3350 kN, fatigue load limit Pu 285 kN, reference speed 850 r/min, limiting speed 1,200 r/min, mass about 67000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 24144 bore code work?",
        "a": "The last two digits of 24144 are bore code 44, so 44 × 5 = 220 mm bore. The 370 mm OD and 150 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 24144?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper."
      },
      {
        "q": "Can 24144 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24144K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24144 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24144",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24144-CCK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AOH24144 withdrawal sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24144",
      "24144 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24148",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24148 CC/W33",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 240,
    "D_mm": 400,
    "B_mm": 160,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 2489,
    "static_load_kN": 3900,
    "fatigue_load_limit_kN": 320,
    "max_rpm": 1100,
    "reference_speed_rpm": 750,
    "limiting_speed_rpm": 1100,
    "weight_g": 83000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 24148 appears as 24148 CC/W33: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 240×400×160 mm to the ISO 15 boundary plan. On the SKF nameplate, 24148 follows the ISO 15 convention: 2 for the spherical roller type, 41 for the dimension series 41 (medium OD, maximum width), final digits 48 for the 240 mm bore. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. The 80.0 mm radial section height ((400−240)/2) and 83000 g catalogue mass frame a 240 mm bore bearing rated at 2489 kN C — roughly 10.37 kN of dynamic capacity per millimetre of bore before application factors. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 24148 CCK30/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.",
    "applications": [
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 240 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 24100-series series at 240 mm bore (400×160 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 1,100 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 2489/3900 kN ratings are SKF catalogue values for this exact execution (24148 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24148 (cylindrical bore as listed, tapered-bore 24148 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24148 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24148?",
        "a": "The 24148 CC/W33 is a double-row spherical roller bearing with 240 mm bore, 400 mm outer diameter and 160 mm width (9.449 × 15.748 × 6.299 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2489 kN, C0 3900 kN, fatigue load limit Pu 320 kN, reference speed 750 r/min, limiting speed 1,100 r/min, mass about 83000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 24148 bore code work?",
        "a": "The last two digits of 24148 are bore code 48, so 48 × 5 = 240 mm bore. The 400 mm OD and 160 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 24148?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper."
      },
      {
        "q": "Can 24148 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24148K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24148 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24148",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24148-CCK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AOH24148 withdrawal sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24148",
      "24148 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24152",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24152 CC/W33",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 260,
    "D_mm": 440,
    "B_mm": 180,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 3086,
    "static_load_kN": 4800,
    "fatigue_load_limit_kN": 380,
    "max_rpm": 950,
    "reference_speed_rpm": 670,
    "limiting_speed_rpm": 950,
    "weight_g": 110000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number 24152 CC/W33 in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 260 mm shaft, dimension series 41 (medium OD, maximum width), with open execution and two pressed-steel cages with a floating guide ring. The code breaks down as type digit 2 (double-row spherical roller), dimension series 41 (dimension series 41 (medium OD, maximum width)), and bore code 52 = 260 mm; dimensions 260×440×180 mm therefore match the ISO 15 envelope. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. The 380 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.56 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 24152 CCK30/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.",
    "applications": [
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems"
    ],
    "pitfalls": [
      "At 260 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 24100-series series at 260 mm bore (440×180 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 950 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.",
      "The 24152 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 3086/4800 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 24152 pits long before its L10 life.",
      "The 3086/4800 kN ratings are SKF catalogue values for this exact execution (24152 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24152 (cylindrical bore as listed, tapered-bore 24152 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24152 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24152?",
        "a": "The 24152 CC/W33 is a double-row spherical roller bearing with 260 mm bore, 440 mm outer diameter and 180 mm width (10.236 × 17.323 × 7.087 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 3086 kN, C0 4800 kN, fatigue load limit Pu 380 kN, reference speed 670 r/min, limiting speed 950 r/min, mass about 110000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 24152 bore code work?",
        "a": "The last two digits of 24152 are bore code 52, so 52 × 5 = 260 mm bore. The 440 mm OD and 180 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 24152?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper."
      },
      {
        "q": "Can 24152 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24152K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24152 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24152",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24152-CCK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AOH24152 withdrawal sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24152",
      "24152 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24156",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24156 CC/W33",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 280,
    "D_mm": 460,
    "B_mm": 180,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 3183,
    "static_load_kN": 5100,
    "fatigue_load_limit_kN": 415,
    "max_rpm": 900,
    "reference_speed_rpm": 630,
    "limiting_speed_rpm": 900,
    "weight_g": 120000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24156 CC/W33 belongs to the SKF spherical roller range — the 280 mm bore entry in the 24100-series series (dimension series 41 (medium OD, maximum width)), dimensioned 460 mm OD and 180 mm wide. On the SKF nameplate, 24156 follows the ISO 15 convention: 2 for the spherical roller type, 41 for the dimension series 41 (medium OD, maximum width), final digits 56 for the 280 mm bore. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. At 630 r/min reference speed the 90.0 mm-section 24156 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 900 r/min as the mechanical ceiling. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 280 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.",
    "applications": [
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "wind-turbine main shaft support"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems"
    ],
    "pitfalls": [
      "At 280 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 24100-series series at 280 mm bore (460×180 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 900 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "Never use the tapered-bore CCK30/K30 variant's drive-up figures on this cylindrical-bore 24156; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 3183/5100 kN ratings are SKF catalogue values for this exact execution (24156 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24156 (cylindrical bore as listed, tapered-bore 24156 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24156 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24156?",
        "a": "The 24156 CC/W33 is a double-row spherical roller bearing with 280 mm bore, 460 mm outer diameter and 180 mm width (11.024 × 18.11 × 7.087 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 3183 kN, C0 5100 kN, fatigue load limit Pu 415 kN, reference speed 630 r/min, limiting speed 900 r/min, mass about 120000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 24156 bore code work?",
        "a": "The last two digits of 24156 are bore code 56, so 56 × 5 = 280 mm bore. The 460 mm OD and 180 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 24156?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper."
      },
      {
        "q": "Can 24156 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24156K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24156 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24156",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24156-CCK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AOH24156 withdrawal sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24156",
      "24156 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24160",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24160 CC/W33",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 300,
    "D_mm": 500,
    "B_mm": 200,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 3876,
    "static_load_kN": 6300,
    "fatigue_load_limit_kN": 465,
    "max_rpm": 800,
    "reference_speed_rpm": 560,
    "limiting_speed_rpm": 800,
    "weight_g": 160000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24160 is a double-row spherical roller bearing in the 24100-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. The code breaks down as type digit 2 (double-row spherical roller), dimension series 41 (dimension series 41 (medium OD, maximum width)), and bore code 60 = 300 mm; dimensions 300×500×200 mm therefore match the ISO 15 envelope. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. The 100.0 mm radial section height ((500−300)/2) and 160000 g catalogue mass frame a 300 mm bore bearing rated at 3876 kN C — roughly 12.92 kN of dynamic capacity per millimetre of bore before application factors. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 300 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.",
    "applications": [
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still"
    ],
    "pitfalls": [
      "At 300 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 24100-series series at 300 mm bore (500×200 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 800 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.",
      "The 24160 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 3876/6300 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "Catalogue reference speed and limiting speed are different limits: the 560 r/min reference is a thermal criterion under load, while the 800 r/min limiting value is the mechanical ceiling — observe both.",
      "The 3876/6300 kN ratings are SKF catalogue values for this exact execution (24160 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24160 (cylindrical bore as listed, tapered-bore 24160 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24160 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24160?",
        "a": "The 24160 CC/W33 is a double-row spherical roller bearing with 300 mm bore, 500 mm outer diameter and 200 mm width (11.811 × 19.685 × 7.874 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 3876 kN, C0 6300 kN, fatigue load limit Pu 465 kN, reference speed 560 r/min, limiting speed 800 r/min, mass about 160000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 24160 bore code work?",
        "a": "The last two digits of 24160 are bore code 60, so 60 × 5 = 300 mm bore. The 500 mm OD and 200 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 24160?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper."
      },
      {
        "q": "Can 24160 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24160K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24160 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24160",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24160-CCK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AOH24160 withdrawal sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24160",
      "24160 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24164",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24164 CC/W33",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 320,
    "D_mm": 540,
    "B_mm": 218,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 4395,
    "static_load_kN": 7100,
    "fatigue_load_limit_kN": 510,
    "max_rpm": 700,
    "reference_speed_rpm": 500,
    "limiting_speed_rpm": 700,
    "weight_g": 210000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 320 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 24164 under catalogue execution 24164 CC/W33: two barrel-roller rows on a sphered outer raceway. On the SKF nameplate, 24164 follows the ISO 15 convention: 2 for the spherical roller type, 41 for the dimension series 41 (medium OD, maximum width), final digits 64 for the 320 mm bore. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. With C 4395 kN and C0 7100 kN, the 24164 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. Mount with the spherical bearing's self-alignment in mind: it compensates ≈ 0.5–2.5° of misalignment depending on series, but the shaft and housing seats still set the datum — a rotating inner ring on a 320 mm shaft typically takes a m6 seat with an H7 housing bore.",
    "applications": [
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still"
    ],
    "pitfalls": [
      "At 320 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 24100-series series at 320 mm bore (540×218 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 700 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 210000 g mass and 218 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 24164.",
      "The 4395/7100 kN ratings are SKF catalogue values for this exact execution (24164 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24164 (cylindrical bore as listed, tapered-bore 24164 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24164 CC/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24164?",
        "a": "The 24164 CC/W33 is a double-row spherical roller bearing with 320 mm bore, 540 mm outer diameter and 218 mm width (12.598 × 21.26 × 8.583 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 4395 kN, C0 7100 kN, fatigue load limit Pu 510 kN, reference speed 500 r/min, limiting speed 700 r/min, mass about 210000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring."
      },
      {
        "q": "How does the 24164 bore code work?",
        "a": "The last two digits of 24164 are bore code 64, so 64 × 5 = 320 mm bore. The 540 mm OD and 218 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the CC/W33 suffix mean on 24164?",
        "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper."
      },
      {
        "q": "Can 24164 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24164K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24164 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24164",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24164-CCK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AOH24164 withdrawal sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24164",
      "24164 CC/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24168",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24168 ECCJ/W33",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 340,
    "D_mm": 580,
    "B_mm": 243,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 5487,
    "static_load_kN": 8650,
    "fatigue_load_limit_kN": 630,
    "max_rpm": 630,
    "reference_speed_rpm": 430,
    "limiting_speed_rpm": 630,
    "weight_g": 280000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 24168 ECCJ/W33 is a 340×580×243 mm spherical roller bearing — the dimension series 41 (medium OD, maximum width) entry for a 340 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. Numbering ties the bearing to its envelope: 24168 means spherical-roller type, dimension series 41, 340 mm bore — which is why the 580×243 mm outline swaps dimensionally with other ISO 15 bearings of the same code. CJ/ECCJ bearings here run a stamped steel window cage rather than the older two-cage CC arrangement; quote the full ECCJ/W33 designation when ordering, and do not assume the K tapered-bore execution is a field conversion. Catalogue mass 280000 g for the 340×580×243 mm open execution covers the a stamped sheet-steel window-type cage with low-friction guidance (CJ design); tapered-bore and sealed variants differ in mass and carry their own order numbers. A 340 mm rotating inner ring usually runs m6 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.",
    "applications": [
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still"
    ],
    "pitfalls": [
      "At 340 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 24100-series series at 340 mm bore (580×243 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 630 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.",
      "Shaft and housing fillets must clear the bearing chamfer so the 243 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 24168 pits long before its L10 life.",
      "The 5487/8650 kN ratings are SKF catalogue values for this exact execution (24168 ECCJ/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24168 (cylindrical bore as listed, tapered-bore 24168 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24168 ECCJ/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24168?",
        "a": "The 24168 ECCJ/W33 is a double-row spherical roller bearing with 340 mm bore, 580 mm outer diameter and 243 mm width (13.386 × 22.835 × 9.567 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 5487 kN, C0 8650 kN, fatigue load limit Pu 630 kN, reference speed 430 r/min, limiting speed 630 r/min, mass about 280000 g. It is an open, self-aligning bearing with a stamped sheet-steel window-type cage with low-friction guidance (CJ design)."
      },
      {
        "q": "How does the 24168 bore code work?",
        "a": "The last two digits of 24168 are bore code 68, so 68 × 5 = 340 mm bore. The 580 mm OD and 243 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the ECCJ/W33 suffix mean on 24168?",
        "a": "The suffix ECCJ/W33 reads ECCJ — the optimized, higher-capacity version of the CJ design, with a stamped sheet-steel window-type cage with low-friction guidance, plus W33 (outer-ring groove and three lubrication holes); CCK30/W33 is the 1:30 tapered-bore counterpart."
      },
      {
        "q": "Can 24168 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24168K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24168 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24168",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24168-ECCK30J-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AOH24168 withdrawal sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C4168-K30MB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 4168 K30MB shares the 340×580×243 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24168",
      "24168 ECCJ/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24172",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24172 ECCJ/W33",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 360,
    "D_mm": 600,
    "B_mm": 243,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 5737,
    "static_load_kN": 9300,
    "fatigue_load_limit_kN": 670,
    "max_rpm": 600,
    "reference_speed_rpm": 400,
    "limiting_speed_rpm": 600,
    "weight_g": 280000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF 24172 (24172 ECCJ/W33) is the spherical-roller choice for a 360 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 600×243 mm ISO 15 envelope. On the SKF nameplate, 24172 follows the ISO 15 convention: 2 for the spherical roller type, 41 for the dimension series 41 (medium OD, maximum width), final digits 72 for the 360 mm bore. CJ/ECCJ bearings here run a stamped steel window cage rather than the older two-cage CC arrangement; quote the full ECCJ/W33 designation when ordering, and do not assume the K tapered-bore execution is a field conversion. Selection arithmetic: the C0/C ratio is about 1.62 (static 9300 kN against dynamic 5737 kN), typical of a spherical roller sized for heavy combined loads, and the 670 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. A 360 mm rotating inner ring usually runs m6 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.",
    "applications": [
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At 360 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 24100-series series at 360 mm bore (600×243 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 600 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "Shaft and housing fillets must clear the bearing chamfer so the 243 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 5737/9300 kN ratings are SKF catalogue values for this exact execution (24172 ECCJ/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24172 (cylindrical bore as listed, tapered-bore 24172 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24172 ECCJ/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24172?",
        "a": "The 24172 ECCJ/W33 is a double-row spherical roller bearing with 360 mm bore, 600 mm outer diameter and 243 mm width (14.173 × 23.622 × 9.567 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 5737 kN, C0 9300 kN, fatigue load limit Pu 670 kN, reference speed 400 r/min, limiting speed 600 r/min, mass about 280000 g. It is an open, self-aligning bearing with a stamped sheet-steel window-type cage with low-friction guidance (CJ design)."
      },
      {
        "q": "How does the 24172 bore code work?",
        "a": "The last two digits of 24172 are bore code 72, so 72 × 5 = 360 mm bore. The 600 mm OD and 243 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the ECCJ/W33 suffix mean on 24172?",
        "a": "The suffix ECCJ/W33 reads ECCJ — the optimized, higher-capacity version of the CJ design, with a stamped sheet-steel window-type cage with low-friction guidance, plus W33 (outer-ring groove and three lubrication holes); CCK30/W33 is the 1:30 tapered-bore counterpart."
      },
      {
        "q": "Can 24172 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24172K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24172 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24172",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24172-ECCK30J-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AOH24172 withdrawal sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24172",
      "24172 ECCJ/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24176",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24176 ECA/W33",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 380,
    "D_mm": 620,
    "B_mm": 243,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 5936,
    "static_load_kN": 9800,
    "fatigue_load_limit_kN": 710,
    "max_rpm": 530,
    "reference_speed_rpm": 360,
    "limiting_speed_rpm": 530,
    "weight_g": 300000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 24176 appears as 24176 ECA/W33: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 380×620×243 mm to the ISO 15 boundary plan. Numbering ties the bearing to its envelope: 24176 means spherical-roller type, dimension series 41, 380 mm bore — which is why the 620×243 mm outline swaps dimensionally with other ISO 15 bearings of the same code. CA executions here use a machined brass cage (ECA enhanced geometry) rather than pressed steel; specialist suffixes change the bearing materially and must be quoted in full, and the K/CCK tapered-bore variant is a separate order number. Speed planning uses two different ceilings: 360 r/min thermal reference and 530 r/min mechanical limiting speed. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 243 mm width across two roller rows needs the full charge.",
    "applications": [
      "large mining crusher main shafts",
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At 380 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 24100-series series at 380 mm bore (620×243 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 530 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.",
      "Shaft and housing fillets must clear the bearing chamfer so the 243 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "Catalogue reference speed and limiting speed are different limits: the 360 r/min reference is a thermal criterion under load, while the 530 r/min limiting value is the mechanical ceiling — observe both.",
      "The 5936/9800 kN ratings are SKF catalogue values for this exact execution (24176 ECA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24176 (cylindrical bore as listed, tapered-bore 24176 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24176 ECA/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24176?",
        "a": "The 24176 ECA/W33 is a double-row spherical roller bearing with 380 mm bore, 620 mm outer diameter and 243 mm width (14.961 × 24.409 × 9.567 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 5936 kN, C0 9800 kN, fatigue load limit Pu 710 kN, reference speed 360 r/min, limiting speed 530 r/min, mass about 300000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)."
      },
      {
        "q": "How does the 24176 bore code work?",
        "a": "The last two digits of 24176 are bore code 76, so 76 × 5 = 380 mm bore. The 620 mm OD and 243 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the ECA/W33 suffix mean on 24176?",
        "a": "The suffix ECA/W33 reads ECA — the enhanced version of the CA design with optimized internal geometry, plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK30/W33 is the 1:30 tapered-bore counterpart."
      },
      {
        "q": "Can 24176 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24176K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24176 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24176",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24176-ECAK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AOH24176 withdrawal sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24176",
      "24176 ECA/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24180",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24180 ECA/W33",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 400,
    "D_mm": 650,
    "B_mm": 250,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 6331,
    "static_load_kN": 10600,
    "fatigue_load_limit_kN": 735,
    "max_rpm": 500,
    "reference_speed_rpm": 340,
    "limiting_speed_rpm": 500,
    "weight_g": 340000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number 24180 ECA/W33 in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 400 mm shaft, dimension series 41 (medium OD, maximum width), with open execution and a one-piece machined brass cage guided on the inner ring (CA design). On the SKF nameplate, 24180 follows the ISO 15 convention: 2 for the spherical roller type, 41 for the dimension series 41 (medium OD, maximum width), final digits 80 for the 400 mm bore. CA executions here use a machined brass cage (ECA enhanced geometry) rather than pressed steel; specialist suffixes change the bearing materially and must be quoted in full, and the K/CCK tapered-bore variant is a separate order number. Catalogue mass 340000 g for the 400×650×250 mm open execution covers the a one-piece machined brass cage guided on the inner ring (CA design); tapered-bore and sealed variants differ in mass and carry their own order numbers. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 250 mm width across two roller rows needs the full charge.",
    "applications": [
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 400 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 24100-series series at 400 mm bore (650×250 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 500 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 24180 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 6331/10600 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 6331/10600 kN ratings are SKF catalogue values for this exact execution (24180 ECA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24180 (cylindrical bore as listed, tapered-bore 24180 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24180 ECA/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24180?",
        "a": "The 24180 ECA/W33 is a double-row spherical roller bearing with 400 mm bore, 650 mm outer diameter and 250 mm width (15.748 × 25.591 × 9.843 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 6331 kN, C0 10600 kN, fatigue load limit Pu 735 kN, reference speed 340 r/min, limiting speed 500 r/min, mass about 340000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)."
      },
      {
        "q": "How does the 24180 bore code work?",
        "a": "The last two digits of 24180 are bore code 80, so 80 × 5 = 400 mm bore. The 650 mm OD and 250 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the ECA/W33 suffix mean on 24180?",
        "a": "The suffix ECA/W33 reads ECA — the enhanced version of the CA design with optimized internal geometry, plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK30/W33 is the 1:30 tapered-bore counterpart."
      },
      {
        "q": "Can 24180 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24180K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24180 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24180",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24180-ECAK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AOH24180 withdrawal sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24180",
      "24180 ECA/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24184",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24184 ECA/W33",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 420,
    "D_mm": 700,
    "B_mm": 280,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 7577,
    "static_load_kN": 12500,
    "fatigue_load_limit_kN": 850,
    "max_rpm": 480,
    "reference_speed_rpm": 320,
    "limiting_speed_rpm": 480,
    "weight_g": 445000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24184 ECA/W33 belongs to the SKF spherical roller range — the 420 mm bore entry in the 24100-series series (dimension series 41 (medium OD, maximum width)), dimensioned 700 mm OD and 280 mm wide. Numbering ties the bearing to its envelope: 24184 means spherical-roller type, dimension series 41, 420 mm bore — which is why the 700×280 mm outline swaps dimensionally with other ISO 15 bearings of the same code. CA executions here use a machined brass cage (ECA enhanced geometry) rather than pressed steel; specialist suffixes change the bearing materially and must be quoted in full, and the K/CCK tapered-bore variant is a separate order number. The 850 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.65 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. After mounting, swing the outer ring to confirm free self-alignment: the 24184 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.",
    "applications": [
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 420 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 24100-series series at 420 mm bore (700×280 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 480 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.",
      "Shaft and housing fillets must clear the bearing chamfer so the 280 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 7577/12500 kN ratings are SKF catalogue values for this exact execution (24184 ECA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24184 (cylindrical bore as listed, tapered-bore 24184 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24184 ECA/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24184?",
        "a": "The 24184 ECA/W33 is a double-row spherical roller bearing with 420 mm bore, 700 mm outer diameter and 280 mm width (16.535 × 27.559 × 11.024 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 7577 kN, C0 12500 kN, fatigue load limit Pu 850 kN, reference speed 320 r/min, limiting speed 480 r/min, mass about 445000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)."
      },
      {
        "q": "How does the 24184 bore code work?",
        "a": "The last two digits of 24184 are bore code 84, so 84 × 5 = 420 mm bore. The 700 mm OD and 280 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the ECA/W33 suffix mean on 24184?",
        "a": "The suffix ECA/W33 reads ECA — the enhanced version of the CA design with optimized internal geometry, plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK30/W33 is the 1:30 tapered-bore counterpart."
      },
      {
        "q": "Can 24184 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24184K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24184 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24184",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24184-ECAK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AOH24184 withdrawal sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24184",
      "24184 ECA/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24188",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24188 ECA/W33",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 440,
    "D_mm": 720,
    "B_mm": 280,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 7777,
    "static_load_kN": 13200,
    "fatigue_load_limit_kN": 900,
    "max_rpm": 450,
    "reference_speed_rpm": 300,
    "limiting_speed_rpm": 450,
    "weight_g": 460000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24188 is a double-row spherical roller bearing in the 24100-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. Digit by digit, 24188 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 41, and bore reference 88 resolving to 440 mm; 720 mm OD and 280 mm width are the matching ISO 15 boundary values. CA executions here use a machined brass cage (ECA enhanced geometry) rather than pressed steel; specialist suffixes change the bearing materially and must be quoted in full, and the K/CCK tapered-bore variant is a separate order number. At 300 r/min reference speed the 140.0 mm-section 24188 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 450 r/min as the mechanical ceiling. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.",
    "applications": [
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "wind-turbine main shaft support"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 440 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 24100-series series at 440 mm bore (720×280 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 450 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.",
      "Catalogue reference speed and limiting speed are different limits: the 300 r/min reference is a thermal criterion under load, while the 450 r/min limiting value is the mechanical ceiling — observe both.",
      "Shaft and housing fillets must clear the bearing chamfer so the 280 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 7777/13200 kN ratings are SKF catalogue values for this exact execution (24188 ECA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24188 (cylindrical bore as listed, tapered-bore 24188 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24188 ECA/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24188?",
        "a": "The 24188 ECA/W33 is a double-row spherical roller bearing with 440 mm bore, 720 mm outer diameter and 280 mm width (17.323 × 28.346 × 11.024 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 7777 kN, C0 13200 kN, fatigue load limit Pu 900 kN, reference speed 300 r/min, limiting speed 450 r/min, mass about 460000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)."
      },
      {
        "q": "How does the 24188 bore code work?",
        "a": "The last two digits of 24188 are bore code 88, so 88 × 5 = 440 mm bore. The 720 mm OD and 280 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the ECA/W33 suffix mean on 24188?",
        "a": "The suffix ECA/W33 reads ECA — the enhanced version of the CA design with optimized internal geometry, plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK30/W33 is the 1:30 tapered-bore counterpart."
      },
      {
        "q": "Can 24188 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24188K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24188 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24188",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24188-ECAK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AOH24188 withdrawal sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C4188-MB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 4188 MB shares the 440×720×280 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C4188-K30MB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 4188 K30MB shares the 440×720×280 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24188",
      "24188 ECA/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24192",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24192 ECA/W33",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 460,
    "D_mm": 760,
    "B_mm": 300,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 8608,
    "static_load_kN": 14600,
    "fatigue_load_limit_kN": 1000,
    "max_rpm": 430,
    "reference_speed_rpm": 280,
    "limiting_speed_rpm": 430,
    "weight_g": 560000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 460 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 24192 under catalogue execution 24192 ECA/W33: two barrel-roller rows on a sphered outer raceway. Numbering ties the bearing to its envelope: 24192 means spherical-roller type, dimension series 41, 460 mm bore — which is why the 760×300 mm outline swaps dimensionally with other ISO 15 bearings of the same code. CA executions here use a machined brass cage (ECA enhanced geometry) rather than pressed steel; specialist suffixes change the bearing materially and must be quoted in full, and the K/CCK tapered-bore variant is a separate order number. The 150.0 mm radial section height ((760−460)/2) and 560000 g catalogue mass frame a 460 mm bore bearing rated at 8608 kN C — roughly 18.71 kN of dynamic capacity per millimetre of bore before application factors. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.",
    "applications": [
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems"
    ],
    "pitfalls": [
      "At 460 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 24100-series series at 460 mm bore (760×300 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 430 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.",
      "Shaft and housing fillets must clear the bearing chamfer so the 300 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "Never use the tapered-bore CCK30/K30 variant's drive-up figures on this cylindrical-bore 24192; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 8608/14600 kN ratings are SKF catalogue values for this exact execution (24192 ECA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24192 (cylindrical bore as listed, tapered-bore 24192 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24192 ECA/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24192?",
        "a": "The 24192 ECA/W33 is a double-row spherical roller bearing with 460 mm bore, 760 mm outer diameter and 300 mm width (18.11 × 29.921 × 11.811 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 8608 kN, C0 14600 kN, fatigue load limit Pu 1000 kN, reference speed 280 r/min, limiting speed 430 r/min, mass about 560000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)."
      },
      {
        "q": "How does the 24192 bore code work?",
        "a": "The last two digits of 24192 are bore code 92, so 92 × 5 = 460 mm bore. The 760 mm OD and 300 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the ECA/W33 suffix mean on 24192?",
        "a": "The suffix ECA/W33 reads ECA — the enhanced version of the CA design with optimized internal geometry, plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK30/W33 is the 1:30 tapered-bore counterpart."
      },
      {
        "q": "Can 24192 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24192K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24192 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24192",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24192-ECAK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AOH24192 withdrawal sleeve; same ISO 15 envelope, separate order number."
      },
      {
        "equiv_sku": "C4192-MB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 4192 MB shares the 460×760×300 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C4192-K30MB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 4192 K30MB shares the 460×760×300 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24192",
      "24192 ECA/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24196",
    "brand": "SKF",
    "manufacturer_designation": "SKF 24196 ECA/W33",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 480,
    "D_mm": 790,
    "B_mm": 308,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 9198,
    "static_load_kN": 15600,
    "fatigue_load_limit_kN": 1040,
    "max_rpm": 400,
    "reference_speed_rpm": 260,
    "limiting_speed_rpm": 400,
    "weight_g": 605000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 24196 ECA/W33 is a 480×790×308 mm spherical roller bearing — the dimension series 41 (medium OD, maximum width) entry for a 480 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. Digit by digit, 24196 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 41, and bore reference 96 resolving to 480 mm; 790 mm OD and 308 mm width are the matching ISO 15 boundary values. CA executions here use a machined brass cage (ECA enhanced geometry) rather than pressed steel; specialist suffixes change the bearing materially and must be quoted in full, and the K/CCK tapered-bore variant is a separate order number. With C 9198 kN and C0 15600 kN, the 24196 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 24196 CCK30/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.",
    "applications": [
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems"
    ],
    "pitfalls": [
      "At 480 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 24100-series series at 480 mm bore (790×308 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 400 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.",
      "Catalogue reference speed and limiting speed are different limits: the 260 r/min reference is a thermal criterion under load, while the 400 r/min limiting value is the mechanical ceiling — observe both.",
      "The 24196 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 9198/15600 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 9198/15600 kN ratings are SKF catalogue values for this exact execution (24196 ECA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.",
      "SKF lists several executions of 24196 (cylindrical bore as listed, tapered-bore 24196 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24196 ECA/W33 designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24196?",
        "a": "The 24196 ECA/W33 is a double-row spherical roller bearing with 480 mm bore, 790 mm outer diameter and 308 mm width (18.898 × 31.102 × 12.126 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 9198 kN, C0 15600 kN, fatigue load limit Pu 1040 kN, reference speed 260 r/min, limiting speed 400 r/min, mass about 605000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)."
      },
      {
        "q": "How does the 24196 bore code work?",
        "a": "The last two digits of 24196 are bore code 96, so 96 × 5 = 480 mm bore. The 790 mm OD and 308 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code."
      },
      {
        "q": "What does the ECA/W33 suffix mean on 24196?",
        "a": "The suffix ECA/W33 reads ECA — the enhanced version of the CA design with optimized internal geometry, plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK30/W33 is the 1:30 tapered-bore counterpart."
      },
      {
        "q": "Can 24196 accommodate misalignment and axial load?",
        "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load."
      },
      {
        "q": "When should the tapered-bore 24196K30 variant be used instead?",
        "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24196 listed here seats directly on a machined journal."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24196",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier."
      },
      {
        "equiv_sku": "24196-ECAK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:30) execution on AOH24196 withdrawal sleeve; same ISO 15 envelope, separate order number."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24196",
      "24196 ECA/W33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22205-EK",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22205 EK",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 49.9,
    "static_load_kN": 44,
    "fatigue_load_limit_kN": 4.75,
    "max_rpm": 17000,
    "reference_speed_rpm": 13000,
    "limiting_speed_rpm": 17000,
    "weight_g": 330,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22205-ek is the 1:12 tapered-bore execution of the 22200-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 22205, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. Reading the designation: the leading 2 marks a spherical roller bearing, the 22 is the ISO 15 dimension series (dimension series 22 (medium OD, wide)), and the last two digits encode the 25 mm bore; the 52 mm OD and 18 mm width follow the ISO 15 general plan. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. Selection arithmetic: the C0/C ratio is about 0.88 (static 44 kN against dynamic 49.9 kN), typical of a spherical roller sized for heavy combined loads, and the 4.75 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. For shafts with a locating shoulder, use an AH withdrawal sleeve instead of an adapter sleeve: the bearing presses against the shoulder and the sleeve is drawn out for dismounting, making the 22205-ek removable without an induction heater.",
    "applications": [
      "small vibrating screens and sieve shafts",
      "agricultural elevator and auger shafts",
      "fan and pulley shafts that need periodic bearing removal in the field",
      "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems"
    ],
    "pitfalls": [
      "At a 25 mm bore the small barrel rollers skid readily at light load; keep the radial load above the minimum (roughly 0.01·C0) and avoid long idling at speed — unloaded 22205-ek rows scuff the raceway before fatigue ever shows.",
      "The 22200-series series at 25 mm bore (52×18 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.",
      "The 22205-ek and its cylindrical-bore counterpart 22205 share envelope and load ratings (49.9/44 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 25 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 22205-ek with different sleeves.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 49.9/44 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22205 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22205-ek?",
        "a": "The SKF 22205 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 25 mm nominal bore, 52 mm outer diameter and 18 mm width (0.984 × 2.047 × 0.709 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 49.9 kN, C0 44 kN, Pu 4.75 kN, reference speed 13,000 r/min, limiting speed 17,000 r/min, mass about 330 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 22205-ek?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 22205-ek?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 25 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 22205-ek driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 22205-ek and 22205?",
        "a": "They share the ISO 15 envelope and the same 49.9/44 kN ratings, but 22205-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22205 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22205",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 22205; identical ISO 15 envelope, fits H305 adapter sleeve on a 20 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22205-EK",
      "SKF 22205 EK",
      "22205 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22206-EK",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22206 EK",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 66.1,
    "static_load_kN": 60,
    "fatigue_load_limit_kN": 6.4,
    "max_rpm": 14000,
    "reference_speed_rpm": 10000,
    "limiting_speed_rpm": 14000,
    "weight_g": 390,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For sleeve mounting on a 30 mm shaft, SKF order number SKF 22206 EK is the 1:12 tapered-bore spherical roller bearing in the 22200-series family (dimension series 22 (medium OD, wide)); the cylindrical-bore equivalent is a separate order number, 22206. On the SKF nameplate, 22206-ek follows the ISO 15 convention: 2 for the spherical roller type, 22 for the dimension series 22 (medium OD, wide), final digits 06 for the 30 mm bore. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. At 10,000 r/min reference speed the 16.0 mm-section 22206-ek is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 14,000 r/min as the mechanical ceiling. Over-driving the 22206-ek up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.",
    "applications": [
      "extruder gearbox shafts",
      "vibrating screen and scalper main shafts",
      "fan and pulley shafts that need periodic bearing removal in the field",
      "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still"
    ],
    "pitfalls": [
      "On this 30 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.",
      "The 22200-series series at 30 mm bore (62×20 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 20 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "The 22206-ek and its cylindrical-bore counterpart 22206 share envelope and load ratings (66.1/60 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "Catalogue reference speed and limiting speed are different limits: the 10,000 r/min reference is a thermal criterion under load, while the 14,000 r/min limiting value is the mechanical ceiling — observe both.",
      "The 66.1/60 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22206 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22206-ek?",
        "a": "The SKF 22206 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 30 mm nominal bore, 62 mm outer diameter and 20 mm width (1.181 × 2.441 × 0.787 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 66.1 kN, C0 60 kN, Pu 6.4 kN, reference speed 10,000 r/min, limiting speed 14,000 r/min, mass about 390 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 22206-ek?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 22206-ek?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 30 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 22206-ek driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 22206-ek and 22206?",
        "a": "They share the ISO 15 envelope and the same 66.1/60 kN ratings, but 22206-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22206 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22206",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 22206; identical ISO 15 envelope, fits H306 adapter sleeve on a 25 mm shaft."
      },
      {
        "equiv_sku": "C2206-TN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2206 TN9 shares the 30×62×20 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C2206-KTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2206 KTN9 shares the 30×62×20 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C2206-V",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2206 V shares the 30×62×20 mm envelope but catalogue C/C0 differ (76.5/71 kN vs 66.1/60 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22206-EK",
      "SKF 22206 EK",
      "22206 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22207-EK",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22207 EK",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 35,
    "D_mm": 72,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 88.8,
    "static_load_kN": 85,
    "fatigue_load_limit_kN": 9.3,
    "max_rpm": 12000,
    "reference_speed_rpm": 9000,
    "limiting_speed_rpm": 12000,
    "weight_g": 590,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 22207-ek denotes the tapered-bore version (K suffix, taper 1:12) of the 22200-series spherical roller bearing: dimensioned 35×72×23 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. The code breaks down as type digit 2 (double-row spherical roller), dimension series 22 (dimension series 22 (medium OD, wide)), and bore code 07 = 35 mm; dimensions 35×72×23 mm therefore match the ISO 15 envelope. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. Catalogue mass 590 g for the 35×72×23 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. On an H adapter sleeve the 35 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 22207-ek inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.",
    "applications": [
      "hammer-mill and crusher rotors",
      "continuous-caster guide rolls",
      "fan and pulley shafts that need periodic bearing removal in the field",
      "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "On this 35 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.",
      "The 22200-series series at 35 mm bore (72×23 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 22207-ek to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 35 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 22207-ek with different sleeves.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 22207-ek pits long before its L10 life.",
      "The 88.8/85 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22207 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22207-ek?",
        "a": "The SKF 22207 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 35 mm nominal bore, 72 mm outer diameter and 23 mm width (1.378 × 2.835 × 0.906 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 88.8 kN, C0 85 kN, Pu 9.3 kN, reference speed 9,000 r/min, limiting speed 12,000 r/min, mass about 590 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 22207-ek?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 22207-ek?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 35 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 22207-ek driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 22207-ek and 22207?",
        "a": "They share the ISO 15 envelope and the same 88.8/85 kN ratings, but 22207-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22207 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22207",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 22207; identical ISO 15 envelope, fits H307 adapter sleeve on a 30 mm shaft."
      },
      {
        "equiv_sku": "C2207-TN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2207 TN9 shares the 35×72×23 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C2207-KTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2207 KTN9 shares the 35×72×23 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C2207-V",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2207 V shares the 35×72×23 mm envelope but catalogue C/C0 differ (95/96 kN vs 88.8/85 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22207-EK",
      "SKF 22207 EK",
      "22207 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22208-EK",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22208 EK",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 40,
    "D_mm": 80,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 98.5,
    "static_load_kN": 90,
    "fatigue_load_limit_kN": 9.8,
    "max_rpm": 11000,
    "reference_speed_rpm": 8000,
    "limiting_speed_rpm": 11000,
    "weight_g": 680,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22208-ek is the 1:12 tapered-bore execution of the 22200-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 22208, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. Numbering ties the bearing to its envelope: 22208-ek means spherical-roller type, dimension series 22, 40 mm bore — which is why the 80×23 mm outline swaps dimensionally with other ISO 15 bearings of the same code. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. Catalogue mass 680 g for the 40×80×23 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. On an H adapter sleeve the 40 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 22208-ek inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.",
    "applications": [
      "hammer-mill and crusher rotors",
      "continuous-caster guide rolls",
      "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat",
      "split-housing plummer block arrangements with bearings swapped in situ"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals"
    ],
    "pitfalls": [
      "On this 40 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.",
      "The 22200-series series at 40 mm bore (80×23 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.",
      "The 22208-ek and its cylindrical-bore counterpart 22208 share envelope and load ratings (98.5/90 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 22208-ek to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "Catalogue reference speed and limiting speed are different limits: the 8,000 r/min reference is a thermal criterion under load, while the 11,000 r/min limiting value is the mechanical ceiling — observe both.",
      "The 98.5/90 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22208 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22208-ek?",
        "a": "The SKF 22208 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 40 mm nominal bore, 80 mm outer diameter and 23 mm width (1.575 × 3.15 × 0.906 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 98.5 kN, C0 90 kN, Pu 9.8 kN, reference speed 8,000 r/min, limiting speed 11,000 r/min, mass about 680 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 22208-ek?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 22208-ek?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 40 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 22208-ek driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 22208-ek and 22208?",
        "a": "They share the ISO 15 envelope and the same 98.5/90 kN ratings, but 22208-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22208 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22208",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 22208; identical ISO 15 envelope, fits H308 adapter sleeve on a 35 mm shaft."
      },
      {
        "equiv_sku": "C2208-TN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2208 TN9 shares the 40×80×23 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C2208-KTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2208 KTN9 shares the 40×80×23 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C2208-V",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2208 V shares the 40×80×23 mm envelope but catalogue C/C0 differ (102/104 kN vs 98.5/90 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22208-EK",
      "SKF 22208 EK",
      "22208 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22308-EK",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22308 EK",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 155,
    "static_load_kN": 140,
    "fatigue_load_limit_kN": 15,
    "max_rpm": 8000,
    "reference_speed_rpm": 6000,
    "limiting_speed_rpm": 8000,
    "weight_g": 1250,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For sleeve mounting on a 40 mm shaft, SKF order number SKF 22308 EK is the 1:12 tapered-bore spherical roller bearing in the 22300-series family (dimension series 23 (heavy OD, wide)); the cylindrical-bore equivalent is a separate order number, 22308. On the SKF nameplate, 22308-ek follows the ISO 15 convention: 2 for the spherical roller type, 23 for the dimension series 23 (heavy OD, wide), final digits 08 for the 40 mm bore. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. Selection arithmetic: the C0/C ratio is about 0.90 (static 140 kN against dynamic 155 kN), typical of a spherical roller sized for heavy combined loads, and the 15 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. At 40 mm bore, dismount after service is by KM locknut reversal or a hydraulic nut on larger sizes; oil-injection grooves on the bigger sleeves let pressurised oil float the 22308-ek off the taper without scoring either surface.",
    "applications": [
      "vibrating screen and scalper main shafts",
      "conveyor drive and bend pulleys",
      "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals"
    ],
    "pitfalls": [
      "On this 40 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.",
      "The 22300-series series at 40 mm bore (90×33 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 8,000 r/min ceiling.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 33 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 22308-ek to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 22308-ek pits long before its L10 life.",
      "The 155/140 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22308 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22308-ek?",
        "a": "The SKF 22308 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 40 mm nominal bore, 90 mm outer diameter and 33 mm width (1.575 × 3.543 × 1.299 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 155 kN, C0 140 kN, Pu 15 kN, reference speed 6,000 r/min, limiting speed 8,000 r/min, mass about 1250 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 22308-ek?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 22308-ek?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 40 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 22308-ek driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 22308-ek and 22308?",
        "a": "They share the ISO 15 envelope and the same 155/140 kN ratings, but 22308-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22308 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22308",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 22308; identical ISO 15 envelope, fits H2308 adapter sleeve on a 35 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22308-EK",
      "SKF 22308 EK",
      "22308 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22209-EK",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22209 EK",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 45,
    "D_mm": 85,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 104,
    "static_load_kN": 98,
    "fatigue_load_limit_kN": 10.8,
    "max_rpm": 10000,
    "reference_speed_rpm": 7500,
    "limiting_speed_rpm": 10000,
    "weight_g": 810,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For sleeve mounting on a 45 mm shaft, SKF order number SKF 22209 EK is the 1:12 tapered-bore spherical roller bearing in the 22200-series family (dimension series 22 (medium OD, wide)); the cylindrical-bore equivalent is a separate order number, 22209. Reading the designation: the leading 2 marks a spherical roller bearing, the 22 is the ISO 15 dimension series (dimension series 22 (medium OD, wide)), and the last two digits encode the 45 mm bore; the 85 mm OD and 23 mm width follow the ISO 15 general plan. Reading the suffix on 22209-ek, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 22209. With C 104 kN and C0 98 kN, the 22209-ek load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. Mounting on the 1:12 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 45 mm 22209-ek, checked with feeler gauges before and after drive-up.",
    "applications": [
      "centrifugal pump and fan shafts",
      "hammer-mill and crusher rotors",
      "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat",
      "split-housing plummer block arrangements with bearings swapped in situ"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "smearing on the roller-raceway contact during skid starts below the minimum load"
    ],
    "pitfalls": [
      "On this 45 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.",
      "The 22200-series series at 45 mm bore (85×23 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 23 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 23 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 22209-ek pits long before its L10 life.",
      "The 104/98 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22209 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22209-ek?",
        "a": "The SKF 22209 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 45 mm nominal bore, 85 mm outer diameter and 23 mm width (1.772 × 3.346 × 0.906 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 104 kN, C0 98 kN, Pu 10.8 kN, reference speed 7,500 r/min, limiting speed 10,000 r/min, mass about 810 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 22209-ek?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 22209-ek?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 45 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 22209-ek driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 22209-ek and 22209?",
        "a": "They share the ISO 15 envelope and the same 104/98 kN ratings, but 22209-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22209 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22209",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 22209; identical ISO 15 envelope, fits H309 adapter sleeve on a 40 mm shaft."
      },
      {
        "equiv_sku": "C2209-TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2209 TN9 shares the 45×85×23 mm envelope but catalogue C/C0 differ (93/93 kN vs 104/98 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C2209-KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2209 KTN9 shares the 45×85×23 mm envelope but catalogue C/C0 differ (93/93 kN vs 104/98 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C2209-V",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2209 V shares the 45×85×23 mm envelope but catalogue C/C0 differ (106/110 kN vs 104/98 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22209-EK",
      "SKF 22209 EK",
      "22209 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22309-EK",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22309 EK",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 36,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 190,
    "static_load_kN": 183,
    "fatigue_load_limit_kN": 19.6,
    "max_rpm": 7000,
    "reference_speed_rpm": 5300,
    "limiting_speed_rpm": 7000,
    "weight_g": 1700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 22309-ek denotes the tapered-bore version (K suffix, taper 1:12) of the 22300-series spherical roller bearing: dimensioned 45×100×36 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. Digit by digit, 22309-ek reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 23, and bore reference 09 resolving to 45 mm; 100 mm OD and 36 mm width are the matching ISO 15 boundary values. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. Selection arithmetic: the C0/C ratio is about 0.96 (static 183 kN against dynamic 190 kN), typical of a spherical roller sized for heavy combined loads, and the 19.6 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. At 45 mm bore, dismount after service is by KM locknut reversal or a hydraulic nut on larger sizes; oil-injection grooves on the bigger sleeves let pressurised oil float the 22309-ek off the taper without scoring either surface.",
    "applications": [
      "vibrating screen and scalper main shafts",
      "conveyor drive and bend pulleys",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal",
      "stepped shafts fitted with withdrawal sleeves against a fixed shoulder"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "On this 45 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.",
      "The 22300-series series at 45 mm bore (100×36 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 7,000 r/min ceiling.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 45 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 22309-ek with different sleeves.",
      "The 22309-ek and its cylindrical-bore counterpart 22309 share envelope and load ratings (190/183 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "Catalogue reference speed and limiting speed are different limits: the 5,300 r/min reference is a thermal criterion under load, while the 7,000 r/min limiting value is the mechanical ceiling — observe both.",
      "The 190/183 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22309 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22309-ek?",
        "a": "The SKF 22309 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 45 mm nominal bore, 100 mm outer diameter and 36 mm width (1.772 × 3.937 × 1.417 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 190 kN, C0 183 kN, Pu 19.6 kN, reference speed 5,300 r/min, limiting speed 7,000 r/min, mass about 1700 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 22309-ek?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 22309-ek?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 45 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 22309-ek driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 22309-ek and 22309?",
        "a": "They share the ISO 15 envelope and the same 190/183 kN ratings, but 22309-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22309 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22309",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 22309; identical ISO 15 envelope, fits H2309 adapter sleeve on a 40 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22309-EK",
      "SKF 22309 EK",
      "22309 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22210-EK",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22210 EK",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 50,
    "D_mm": 90,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 107,
    "static_load_kN": 108,
    "fatigue_load_limit_kN": 11.8,
    "max_rpm": 9500,
    "reference_speed_rpm": 7000,
    "limiting_speed_rpm": 9500,
    "weight_g": 900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 22210-ek denotes the tapered-bore version (K suffix, taper 1:12) of the 22200-series spherical roller bearing: dimensioned 50×90×23 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. Numbering ties the bearing to its envelope: 22210-ek means spherical-roller type, dimension series 22, 50 mm bore — which is why the 90×23 mm outline swaps dimensionally with other ISO 15 bearings of the same code. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. The 11.8 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.01 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. Because driving up the 1:12 taper consumes radial clearance, K executions are commonly ordered with C3 initial clearance so the residual running clearance after mounting matches the cylindrical-bore 22210 on an interference seat.",
    "applications": [
      "continuous-caster guide rolls",
      "extruder gearbox shafts",
      "split-housing plummer block arrangements with bearings swapped in situ",
      "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "On this 50 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.",
      "The 22200-series series at 50 mm bore (90×23 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 50 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 22210-ek with different sleeves.",
      "The 22210-ek and its cylindrical-bore counterpart 22210 share envelope and load ratings (107/108 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "The 22210-ek shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 107/108 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 107/108 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22210 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22210-ek?",
        "a": "The SKF 22210 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 50 mm nominal bore, 90 mm outer diameter and 23 mm width (1.969 × 3.543 × 0.906 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 107 kN, C0 108 kN, Pu 11.8 kN, reference speed 7,000 r/min, limiting speed 9,500 r/min, mass about 900 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 22210-ek?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 22210-ek?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 50 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 22210-ek driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 22210-ek and 22210?",
        "a": "They share the ISO 15 envelope and the same 107/108 kN ratings, but 22210-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22210 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22210",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 22210; identical ISO 15 envelope, fits H310 adapter sleeve on a 45 mm shaft."
      },
      {
        "equiv_sku": "C2210-TN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2210 TN9 shares the 50×90×23 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C2210-KTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2210 KTN9 shares the 50×90×23 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C2210-V",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2210 V shares the 50×90×23 mm envelope but catalogue C/C0 differ (114/122 kN vs 107/108 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22210-EK",
      "SKF 22210 EK",
      "22210 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21310-EK",
    "brand": "SKF",
    "manufacturer_designation": "SKF 21310 EK",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 27,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 159,
    "static_load_kN": 166,
    "fatigue_load_limit_kN": 18.6,
    "max_rpm": 7500,
    "reference_speed_rpm": 5600,
    "limiting_speed_rpm": 7500,
    "weight_g": 1600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For sleeve mounting on a 50 mm shaft, SKF order number SKF 21310 EK is the 1:12 tapered-bore spherical roller bearing in the 21300-series family (dimension series 13 (heavy OD, normal width)); the cylindrical-bore equivalent is a separate order number, 21310. Numbering ties the bearing to its envelope: 21310-ek means spherical-roller type, dimension series 13, 50 mm bore — which is why the 110×27 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. Selection arithmetic: the C0/C ratio is about 1.04 (static 166 kN against dynamic 159 kN), typical of a spherical roller sized for heavy combined loads, and the 18.6 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Over-driving the 21310-ek up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.",
    "applications": [
      "vibrating screen and scalper main shafts",
      "conveyor drive and bend pulleys",
      "fan and pulley shafts that need periodic bearing removal in the field",
      "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems"
    ],
    "pitfalls": [
      "On this 50 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.",
      "The 21300-series series at 50 mm bore (110×27 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.",
      "The 21310-ek and its cylindrical-bore counterpart 21310 share envelope and load ratings (159/166 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "The 21310-ek and its cylindrical-bore counterpart 21310 share envelope and load ratings (159/166 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 159/166 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 21310 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21310-ek?",
        "a": "The SKF 21310 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 50 mm nominal bore, 110 mm outer diameter and 27 mm width (1.969 × 4.331 × 1.063 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 159 kN, C0 166 kN, Pu 18.6 kN, reference speed 5,600 r/min, limiting speed 7,500 r/min, mass about 1600 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 21310-ek?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 21310-ek?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 50 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 21310-ek driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 21310-ek and 21310?",
        "a": "They share the ISO 15 envelope and the same 159/166 kN ratings, but 21310-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 21310 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21310",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 21310; identical ISO 15 envelope, fits H310 adapter sleeve on a 45 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21310-EK",
      "SKF 21310 EK",
      "21310 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22310-EK",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22310 EK",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 228,
    "static_load_kN": 224,
    "fatigue_load_limit_kN": 24,
    "max_rpm": 6300,
    "reference_speed_rpm": 4800,
    "limiting_speed_rpm": 6300,
    "weight_g": 2250,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22310-ek is the 1:12 tapered-bore execution of the 22300-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 22310, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. Digit by digit, 22310-ek reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 23, and bore reference 10 resolving to 50 mm; 110 mm OD and 40 mm width are the matching ISO 15 boundary values. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. Selection arithmetic: the C0/C ratio is about 0.98 (static 224 kN against dynamic 228 kN), typical of a spherical roller sized for heavy combined loads, and the 24 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Over-driving the 22310-ek up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.",
    "applications": [
      "vibrating screen and scalper main shafts",
      "conveyor drive and bend pulleys",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal",
      "stepped shafts fitted with withdrawal sleeves against a fixed shoulder"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "On this 50 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.",
      "The 22300-series series at 50 mm bore (110×40 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 6,300 r/min ceiling.",
      "The 22310-ek and its cylindrical-bore counterpart 22310 share envelope and load ratings (228/224 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "The 22310-ek and its cylindrical-bore counterpart 22310 share envelope and load ratings (228/224 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "Shaft and housing fillets must clear the bearing chamfer so the 40 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 228/224 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22310 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22310-ek?",
        "a": "The SKF 22310 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 50 mm nominal bore, 110 mm outer diameter and 40 mm width (1.969 × 4.331 × 1.575 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 228 kN, C0 224 kN, Pu 24 kN, reference speed 4,800 r/min, limiting speed 6,300 r/min, mass about 2250 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 22310-ek?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 22310-ek?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 50 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 22310-ek driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 22310-ek and 22310?",
        "a": "They share the ISO 15 envelope and the same 228/224 kN ratings, but 22310-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22310 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22310",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 22310; identical ISO 15 envelope, fits H2310 adapter sleeve on a 45 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22310-EK",
      "SKF 22310 EK",
      "22310 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22211-EK",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22211 EK",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 55,
    "D_mm": 100,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 129,
    "static_load_kN": 127,
    "fatigue_load_limit_kN": 13.7,
    "max_rpm": 8500,
    "reference_speed_rpm": 6300,
    "limiting_speed_rpm": 8500,
    "weight_g": 1100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22211-ek is the 1:12 tapered-bore execution of the 22200-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 22211, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. Reading the designation: the leading 2 marks a spherical roller bearing, the 22 is the ISO 15 dimension series (dimension series 22 (medium OD, wide)), and the last two digits encode the 55 mm bore; the 100 mm OD and 25 mm width follow the ISO 15 general plan. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. Catalogue mass 1100 g for the 55×100×25 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. After drive-up, re-check radial clearance and then swing the outer ring through its self-aligning range: the sphered raceway of the 22211-ek must still tilt ≈ 0.5–2.5° freely — a joint that binds after sleeve mounting signals excessive drive-up or a cocked sleeve.",
    "applications": [
      "hammer-mill and crusher rotors",
      "continuous-caster guide rolls",
      "split-housing plummer block arrangements with bearings swapped in situ",
      "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems"
    ],
    "pitfalls": [
      "On this 55 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.",
      "The 22200-series series at 55 mm bore (100×25 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 22211-ek to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 55 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 22211-ek with different sleeves.",
      "Shaft and housing fillets must clear the bearing chamfer so the 25 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 129/127 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22211 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22211-ek?",
        "a": "The SKF 22211 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 55 mm nominal bore, 100 mm outer diameter and 25 mm width (2.165 × 3.937 × 0.984 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 129 kN, C0 127 kN, Pu 13.7 kN, reference speed 6,300 r/min, limiting speed 8,500 r/min, mass about 1100 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 22211-ek?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 22211-ek?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 55 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 22211-ek driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 22211-ek and 22211?",
        "a": "They share the ISO 15 envelope and the same 129/127 kN ratings, but 22211-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22211 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22211",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 22211; identical ISO 15 envelope, fits H311 adapter sleeve on a 50 mm shaft."
      },
      {
        "equiv_sku": "C2211-TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2211 TN9 shares the 55×100×25 mm envelope but catalogue C/C0 differ (116/114 kN vs 129/127 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C2211-KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2211 KTN9 shares the 55×100×25 mm envelope but catalogue C/C0 differ (116/114 kN vs 129/127 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C2211-V",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2211 V shares the 55×100×25 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C2211-KV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2211 KV shares the 55×100×25 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22211-EK",
      "SKF 22211 EK",
      "22211 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21311-EK",
    "brand": "SKF",
    "manufacturer_designation": "SKF 21311 EK",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 29,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 159,
    "static_load_kN": 166,
    "fatigue_load_limit_kN": 18.6,
    "max_rpm": 7500,
    "reference_speed_rpm": 5600,
    "limiting_speed_rpm": 7500,
    "weight_g": 1950,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 21311-ek denotes the tapered-bore version (K suffix, taper 1:12) of the 21300-series spherical roller bearing: dimensioned 55×120×29 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. Reading the designation: the leading 2 marks a spherical roller bearing, the 13 is the ISO 15 dimension series (dimension series 13 (heavy OD, normal width)), and the last two digits encode the 55 mm bore; the 120 mm OD and 29 mm width follow the ISO 15 general plan. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. Selection arithmetic: the C0/C ratio is about 1.04 (static 166 kN against dynamic 159 kN), typical of a spherical roller sized for heavy combined loads, and the 18.6 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Over-driving the 21311-ek up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.",
    "applications": [
      "vibrating screen and scalper main shafts",
      "conveyor drive and bend pulleys",
      "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat",
      "split-housing plummer block arrangements with bearings swapped in situ"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "On this 55 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.",
      "The 21300-series series at 55 mm bore (120×29 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 29 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 29 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 21311-ek; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 159/166 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 21311 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21311-ek?",
        "a": "The SKF 21311 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 55 mm nominal bore, 120 mm outer diameter and 29 mm width (2.165 × 4.724 × 1.142 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 159 kN, C0 166 kN, Pu 18.6 kN, reference speed 5,600 r/min, limiting speed 7,500 r/min, mass about 1950 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 21311-ek?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 21311-ek?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 55 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 21311-ek driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 21311-ek and 21311?",
        "a": "They share the ISO 15 envelope and the same 159/166 kN ratings, but 21311-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 21311 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21311-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "21311",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 21311; identical ISO 15 envelope, fits H311 adapter sleeve on a 50 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21311-EK",
      "SKF 21311 EK",
      "21311 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22311-EK",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22311 EK",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 43,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 280,
    "static_load_kN": 280,
    "fatigue_load_limit_kN": 30,
    "max_rpm": 5600,
    "reference_speed_rpm": 4300,
    "limiting_speed_rpm": 5600,
    "weight_g": 2850,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For sleeve mounting on a 55 mm shaft, SKF order number SKF 22311 EK is the 1:12 tapered-bore spherical roller bearing in the 22300-series family (dimension series 23 (heavy OD, wide)); the cylindrical-bore equivalent is a separate order number, 22311. The code breaks down as type digit 2 (double-row spherical roller), dimension series 23 (dimension series 23 (heavy OD, wide)), and bore code 11 = 55 mm; dimensions 55×120×43 mm therefore match the ISO 15 envelope. Reading the suffix on 22311-ek, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 22311. Selection arithmetic: the C0/C ratio is about 1.00 (static 280 kN against dynamic 280 kN), typical of a spherical roller sized for heavy combined loads, and the 30 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Over-driving the 22311-ek up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.",
    "applications": [
      "vibrating screen and scalper main shafts",
      "conveyor drive and bend pulleys",
      "stepped shafts fitted with withdrawal sleeves against a fixed shoulder",
      "fan and pulley shafts that need periodic bearing removal in the field"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "smearing on the roller-raceway contact during skid starts below the minimum load"
    ],
    "pitfalls": [
      "On this 55 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.",
      "The 22300-series series at 55 mm bore (120×43 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 5,600 r/min ceiling.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 43 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 43 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "The 22311-ek shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 280/280 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 280/280 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22311 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22311-ek?",
        "a": "The SKF 22311 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 55 mm nominal bore, 120 mm outer diameter and 43 mm width (2.165 × 4.724 × 1.693 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 280 kN, C0 280 kN, Pu 30 kN, reference speed 4,300 r/min, limiting speed 5,600 r/min, mass about 2850 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 22311-ek?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 22311-ek?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 55 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 22311-ek driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 22311-ek and 22311?",
        "a": "They share the ISO 15 envelope and the same 280/280 kN ratings, but 22311-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22311 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22311",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 22311; identical ISO 15 envelope, fits H2311 adapter sleeve on a 50 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22311-EK",
      "SKF 22311 EK",
      "22311 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22212-EK",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22212 EK",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 60,
    "D_mm": 110,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 159,
    "static_load_kN": 166,
    "fatigue_load_limit_kN": 18.6,
    "max_rpm": 7500,
    "reference_speed_rpm": 5600,
    "limiting_speed_rpm": 7500,
    "weight_g": 1450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For sleeve mounting on a 60 mm shaft, SKF order number SKF 22212 EK is the 1:12 tapered-bore spherical roller bearing in the 22200-series family (dimension series 22 (medium OD, wide)); the cylindrical-bore equivalent is a separate order number, 22212. On the SKF nameplate, 22212-ek follows the ISO 15 convention: 2 for the spherical roller type, 22 for the dimension series 22 (medium OD, wide), final digits 12 for the 60 mm bore. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. Catalogue mass 1450 g for the 60×110×28 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. After drive-up, re-check radial clearance and then swing the outer ring through its self-aligning range: the sphered raceway of the 22212-ek must still tilt ≈ 0.5–2.5° freely — a joint that binds after sleeve mounting signals excessive drive-up or a cocked sleeve.",
    "applications": [
      "marine propulsion and thruster shafts",
      "cement-mill trunnion and drive shafts",
      "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Mount the 60 mm bore 22212-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 22200-series series at 60 mm bore (110×28 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.",
      "The 22212-ek and its cylindrical-bore counterpart 22212 share envelope and load ratings (159/166 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 22212-ek to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "The 22212-ek shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 159/166 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 159/166 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22212 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22212-ek?",
        "a": "The SKF 22212 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 60 mm nominal bore, 110 mm outer diameter and 28 mm width (2.362 × 4.331 × 1.102 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 159 kN, C0 166 kN, Pu 18.6 kN, reference speed 5,600 r/min, limiting speed 7,500 r/min, mass about 1450 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 22212-ek?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 22212-ek?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 60 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 22212-ek driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 22212-ek and 22212?",
        "a": "They share the ISO 15 envelope and the same 159/166 kN ratings, but 22212-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22212 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22212",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 22212; identical ISO 15 envelope, fits H312 adapter sleeve on a 55 mm shaft."
      },
      {
        "equiv_sku": "C2212-TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2212 TN9 shares the 60×110×28 mm envelope but catalogue C/C0 differ (143/156 kN vs 159/166 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C2212-KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2212 KTN9 shares the 60×110×28 mm envelope but catalogue C/C0 differ (143/156 kN vs 159/166 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C2212-V",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2212 V shares the 60×110×28 mm envelope but catalogue C/C0 differ (166/190 kN vs 159/166 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C2212-KV",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2212 KV shares the 60×110×28 mm envelope but catalogue C/C0 differ (166/190 kN vs 159/166 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22212-EK",
      "SKF 22212 EK",
      "22212 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21312-EK",
    "brand": "SKF",
    "manufacturer_designation": "SKF 21312 EK",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 60,
    "D_mm": 130,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 217,
    "static_load_kN": 240,
    "fatigue_load_limit_kN": 26.5,
    "max_rpm": 6300,
    "reference_speed_rpm": 4800,
    "limiting_speed_rpm": 6300,
    "weight_g": 2350,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "21312-ek is the 1:12 tapered-bore execution of the 21300-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 21312, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. On the SKF nameplate, 21312-ek follows the ISO 15 convention: 2 for the spherical roller type, 13 for the dimension series 13 (heavy OD, normal width), final digits 12 for the 60 mm bore. Reading the suffix on 21312-ek, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 21312. At 4,800 r/min reference speed the 35.0 mm-section 21312-ek is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 6,300 r/min as the mechanical ceiling. On an H adapter sleeve the 60 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 21312-ek inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.",
    "applications": [
      "heavy conveyor head shafts in mining",
      "jaw and cone crusher main shafts",
      "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat",
      "split-housing plummer block arrangements with bearings swapped in situ"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Mount the 60 mm bore 21312-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 21300-series series at 60 mm bore (130×31 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 60 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 21312-ek with different sleeves.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 21312-ek to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 217/240 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 21312 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21312-ek?",
        "a": "The SKF 21312 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 60 mm nominal bore, 130 mm outer diameter and 31 mm width (2.362 × 5.118 × 1.22 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 217 kN, C0 240 kN, Pu 26.5 kN, reference speed 4,800 r/min, limiting speed 6,300 r/min, mass about 2350 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 21312-ek?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 21312-ek?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 60 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 21312-ek driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 21312-ek and 21312?",
        "a": "They share the ISO 15 envelope and the same 217/240 kN ratings, but 21312-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 21312 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21312-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "21312",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 21312; identical ISO 15 envelope, fits H312 adapter sleeve on a 55 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21312-EK",
      "SKF 21312 EK",
      "21312 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22312-EK",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22312 EK",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 60,
    "D_mm": 130,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 325,
    "static_load_kN": 335,
    "fatigue_load_limit_kN": 36,
    "max_rpm": 5300,
    "reference_speed_rpm": 4000,
    "limiting_speed_rpm": 5300,
    "weight_g": 3500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 22312-ek denotes the tapered-bore version (K suffix, taper 1:12) of the 22300-series spherical roller bearing: dimensioned 60×130×46 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. Numbering ties the bearing to its envelope: 22312-ek means spherical-roller type, dimension series 23, 60 mm bore — which is why the 130×46 mm outline swaps dimensionally with other ISO 15 bearings of the same code. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. At 4,000 r/min reference speed the 35.0 mm-section 22312-ek is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 5,300 r/min as the mechanical ceiling. On an H adapter sleeve the 60 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 22312-ek inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.",
    "applications": [
      "heavy conveyor head shafts in mining",
      "jaw and cone crusher main shafts",
      "stepped shafts fitted with withdrawal sleeves against a fixed shoulder",
      "fan and pulley shafts that need periodic bearing removal in the field"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Mount the 60 mm bore 22312-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 22300-series series at 60 mm bore (130×46 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 5,300 r/min ceiling.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 60 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 22312-ek with different sleeves.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 22312-ek to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "Shaft and housing fillets must clear the bearing chamfer so the 46 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 325/335 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22312 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22312-ek?",
        "a": "The SKF 22312 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 60 mm nominal bore, 130 mm outer diameter and 46 mm width (2.362 × 5.118 × 1.811 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 325 kN, C0 335 kN, Pu 36 kN, reference speed 4,000 r/min, limiting speed 5,300 r/min, mass about 3500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 22312-ek?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 22312-ek?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 60 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 22312-ek driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 22312-ek and 22312?",
        "a": "They share the ISO 15 envelope and the same 325/335 kN ratings, but 22312-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22312 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22312",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 22312; identical ISO 15 envelope, fits H2312 adapter sleeve on a 55 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22312-EK",
      "SKF 22312 EK",
      "22312 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22213-EK",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22213 EK",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 65,
    "D_mm": 120,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 198,
    "static_load_kN": 216,
    "fatigue_load_limit_kN": 24,
    "max_rpm": 7000,
    "reference_speed_rpm": 5000,
    "limiting_speed_rpm": 7000,
    "weight_g": 1950,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 22213-ek denotes the tapered-bore version (K suffix, taper 1:12) of the 22200-series spherical roller bearing: dimensioned 65×120×31 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. Digit by digit, 22213-ek reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 22, and bore reference 13 resolving to 65 mm; 120 mm OD and 31 mm width are the matching ISO 15 boundary values. Reading the suffix on 22213-ek, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 22213. With C 198 kN and C0 216 kN, the 22213-ek load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. At 65 mm bore, dismount after service is by KM locknut reversal or a hydraulic nut on larger sizes; oil-injection grooves on the bigger sleeves let pressurised oil float the 22213-ek off the taper without scoring either surface.",
    "applications": [
      "large vibrating screens and feeders",
      "marine propulsion and thruster shafts",
      "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Mount the 65 mm bore 22213-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 22200-series series at 65 mm bore (120×31 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 31 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 31 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "Shaft and housing fillets must clear the bearing chamfer so the 31 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 198/216 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22213 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22213-ek?",
        "a": "The SKF 22213 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 65 mm nominal bore, 120 mm outer diameter and 31 mm width (2.559 × 4.724 × 1.22 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 198 kN, C0 216 kN, Pu 24 kN, reference speed 5,000 r/min, limiting speed 7,000 r/min, mass about 1950 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 22213-ek?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 22213-ek?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 65 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 22213-ek driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 22213-ek and 22213?",
        "a": "They share the ISO 15 envelope and the same 198/216 kN ratings, but 22213-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22213 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22213",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 22213; identical ISO 15 envelope, fits H313 adapter sleeve on a 60 mm shaft."
      },
      {
        "equiv_sku": "C2213-TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2213 TN9 shares the 65×120×31 mm envelope but catalogue C/C0 differ (180/180 kN vs 198/216 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C2213-KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2213 KTN9 shares the 65×120×31 mm envelope but catalogue C/C0 differ (180/180 kN vs 198/216 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C2213-V",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2213 V shares the 65×120×31 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C2213-KV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2213 KV shares the 65×120×31 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22213-EK",
      "SKF 22213 EK",
      "22213 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22214-EK",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22214 EK",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 70,
    "D_mm": 125,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 213,
    "static_load_kN": 228,
    "fatigue_load_limit_kN": 25.5,
    "max_rpm": 6700,
    "reference_speed_rpm": 5000,
    "limiting_speed_rpm": 6700,
    "weight_g": 2150,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22214-ek is the 1:12 tapered-bore execution of the 22200-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 22214, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. The code breaks down as type digit 2 (double-row spherical roller), dimension series 22 (dimension series 22 (medium OD, wide)), and bore code 14 = 70 mm; dimensions 70×125×31 mm therefore match the ISO 15 envelope. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. The 27.5 mm radial section height ((125−70)/2) and 2150 g catalogue mass frame a 70 mm bore bearing rated at 213 kN C — roughly 3.04 kN of dynamic capacity per millimetre of bore before application factors. For shafts with a locating shoulder, use an AH withdrawal sleeve instead of an adapter sleeve: the bearing presses against the shoulder and the sleeve is drawn out for dismounting, making the 22214-ek removable without an induction heater.",
    "applications": [
      "rolling-mill pinion and back-up shafts",
      "large vibrating screens and feeders",
      "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals"
    ],
    "pitfalls": [
      "Mount the 70 mm bore 22214-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 22200-series series at 70 mm bore (125×31 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 70 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 22214-ek with different sleeves.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 22214-ek to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "The 2150 g mass and 31 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 22214-ek.",
      "The 213/228 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22214 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22214-ek?",
        "a": "The SKF 22214 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 70 mm nominal bore, 125 mm outer diameter and 31 mm width (2.756 × 4.921 × 1.22 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 213 kN, C0 228 kN, Pu 25.5 kN, reference speed 5,000 r/min, limiting speed 6,700 r/min, mass about 2150 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 22214-ek?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 22214-ek?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 70 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 22214-ek driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 22214-ek and 22214?",
        "a": "They share the ISO 15 envelope and the same 213/228 kN ratings, but 22214-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22214 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22214",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 22214; identical ISO 15 envelope, fits H314 adapter sleeve on a 60 mm shaft."
      },
      {
        "equiv_sku": "C2214-TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2214 TN9 shares the 70×125×31 mm envelope but catalogue C/C0 differ (186/196 kN vs 213/228 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C2214-KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2214 KTN9 shares the 70×125×31 mm envelope but catalogue C/C0 differ (186/196 kN vs 213/228 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C2214-V",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2214 V shares the 70×125×31 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22214-EK",
      "SKF 22214 EK",
      "22214 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21313-EK",
    "brand": "SKF",
    "manufacturer_designation": "SKF 21313 EK",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 65,
    "D_mm": 140,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 243,
    "static_load_kN": 270,
    "fatigue_load_limit_kN": 29,
    "max_rpm": 6000,
    "reference_speed_rpm": 4300,
    "limiting_speed_rpm": 6000,
    "weight_g": 2900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For sleeve mounting on a 65 mm shaft, SKF order number SKF 21313 EK is the 1:12 tapered-bore spherical roller bearing in the 21300-series family (dimension series 13 (heavy OD, normal width)); the cylindrical-bore equivalent is a separate order number, 21313. Digit by digit, 21313-ek reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 13, and bore reference 13 resolving to 65 mm; 140 mm OD and 33 mm width are the matching ISO 15 boundary values. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. At 4,300 r/min reference speed the 37.5 mm-section 21313-ek is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 6,000 r/min as the mechanical ceiling. On an H adapter sleeve the 65 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 21313-ek inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.",
    "applications": [
      "heavy conveyor head shafts in mining",
      "jaw and cone crusher main shafts",
      "split-housing plummer block arrangements with bearings swapped in situ",
      "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Mount the 65 mm bore 21313-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 21300-series series at 65 mm bore (140×33 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 21313-ek to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "The 21313-ek and its cylindrical-bore counterpart 21313 share envelope and load ratings (243/270 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 21313-ek; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 243/270 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 21313 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21313-ek?",
        "a": "The SKF 21313 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 65 mm nominal bore, 140 mm outer diameter and 33 mm width (2.559 × 5.512 × 1.299 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 243 kN, C0 270 kN, Pu 29 kN, reference speed 4,300 r/min, limiting speed 6,000 r/min, mass about 2900 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 21313-ek?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 21313-ek?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 65 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 21313-ek driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 21313-ek and 21313?",
        "a": "They share the ISO 15 envelope and the same 243/270 kN ratings, but 21313-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 21313 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21313-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "21313",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 21313; identical ISO 15 envelope, fits H313 adapter sleeve on a 60 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21313-EK",
      "SKF 21313 EK",
      "21313 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22313-EK",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22313 EK",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 65,
    "D_mm": 140,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 357,
    "static_load_kN": 360,
    "fatigue_load_limit_kN": 38,
    "max_rpm": 5000,
    "reference_speed_rpm": 3800,
    "limiting_speed_rpm": 5000,
    "weight_g": 4200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22313-ek is the 1:12 tapered-bore execution of the 22300-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 22313, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. Reading the designation: the leading 2 marks a spherical roller bearing, the 23 is the ISO 15 dimension series (dimension series 23 (heavy OD, wide)), and the last two digits encode the 65 mm bore; the 140 mm OD and 48 mm width follow the ISO 15 general plan. Reading the suffix on 22313-ek, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 22313. The 38 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.01 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. Mounting on the 1:12 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 65 mm 22313-ek, checked with feeler gauges before and after drive-up.",
    "applications": [
      "cement-mill trunnion and drive shafts",
      "heavy conveyor head shafts in mining",
      "stepped shafts fitted with withdrawal sleeves against a fixed shoulder",
      "fan and pulley shafts that need periodic bearing removal in the field"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Mount the 65 mm bore 22313-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 22300-series series at 65 mm bore (140×48 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 5,000 r/min ceiling.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 22313-ek to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 48 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "The 4200 g mass and 48 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 22313-ek.",
      "The 357/360 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22313 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22313-ek?",
        "a": "The SKF 22313 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 65 mm nominal bore, 140 mm outer diameter and 48 mm width (2.559 × 5.512 × 1.89 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 357 kN, C0 360 kN, Pu 38 kN, reference speed 3,800 r/min, limiting speed 5,000 r/min, mass about 4200 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 22313-ek?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 22313-ek?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 65 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 22313-ek driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 22313-ek and 22313?",
        "a": "They share the ISO 15 envelope and the same 357/360 kN ratings, but 22313-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22313 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22313",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 22313; identical ISO 15 envelope, fits H2313 adapter sleeve on a 60 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22313-EK",
      "SKF 22313 EK",
      "22313 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21314-EK",
    "brand": "SKF",
    "manufacturer_designation": "SKF 21314 EK",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 70,
    "D_mm": 150,
    "B_mm": 35,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 291,
    "static_load_kN": 325,
    "fatigue_load_limit_kN": 34.5,
    "max_rpm": 5600,
    "reference_speed_rpm": 4000,
    "limiting_speed_rpm": 5600,
    "weight_g": 3700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 21314-ek denotes the tapered-bore version (K suffix, taper 1:12) of the 21300-series spherical roller bearing: dimensioned 70×150×35 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. The code breaks down as type digit 2 (double-row spherical roller), dimension series 13 (dimension series 13 (heavy OD, normal width)), and bore code 14 = 70 mm; dimensions 70×150×35 mm therefore match the ISO 15 envelope. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. The 34.5 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.12 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. Mounting on the 1:12 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 70 mm 21314-ek, checked with feeler gauges before and after drive-up.",
    "applications": [
      "cement-mill trunnion and drive shafts",
      "heavy conveyor head shafts in mining",
      "split-housing plummer block arrangements with bearings swapped in situ",
      "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Mount the 70 mm bore 21314-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 21300-series series at 70 mm bore (150×35 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.",
      "The 21314-ek and its cylindrical-bore counterpart 21314 share envelope and load ratings (291/325 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 70 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 21314-ek with different sleeves.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 291/325 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 21314 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21314-ek?",
        "a": "The SKF 21314 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 70 mm nominal bore, 150 mm outer diameter and 35 mm width (2.756 × 5.906 × 1.378 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 291 kN, C0 325 kN, Pu 34.5 kN, reference speed 4,000 r/min, limiting speed 5,600 r/min, mass about 3700 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 21314-ek?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 21314-ek?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 70 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 21314-ek driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 21314-ek and 21314?",
        "a": "They share the ISO 15 envelope and the same 291/325 kN ratings, but 21314-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 21314 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21314-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "21314",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 21314; identical ISO 15 envelope, fits H314 adapter sleeve on a 60 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21314-EK",
      "SKF 21314 EK",
      "21314 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22314-EK",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22314 EK",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 70,
    "D_mm": 150,
    "B_mm": 51,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 413,
    "static_load_kN": 430,
    "fatigue_load_limit_kN": 45,
    "max_rpm": 4500,
    "reference_speed_rpm": 3400,
    "limiting_speed_rpm": 4500,
    "weight_g": 5350,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For sleeve mounting on a 70 mm shaft, SKF order number SKF 22314 EK is the 1:12 tapered-bore spherical roller bearing in the 22300-series family (dimension series 23 (heavy OD, wide)); the cylindrical-bore equivalent is a separate order number, 22314. On the SKF nameplate, 22314-ek follows the ISO 15 convention: 2 for the spherical roller type, 23 for the dimension series 23 (heavy OD, wide), final digits 14 for the 70 mm bore. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. The 45 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.04 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. Mounting on the 1:12 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 70 mm 22314-ek, checked with feeler gauges before and after drive-up.",
    "applications": [
      "cement-mill trunnion and drive shafts",
      "heavy conveyor head shafts in mining",
      "fan and pulley shafts that need periodic bearing removal in the field",
      "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Mount the 70 mm bore 22314-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 22300-series series at 70 mm bore (150×51 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 4,500 r/min ceiling.",
      "The 22314-ek and its cylindrical-bore counterpart 22314 share envelope and load ratings (413/430 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 70 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 22314-ek with different sleeves.",
      "Shaft and housing fillets must clear the bearing chamfer so the 51 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 413/430 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22314 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22314-ek?",
        "a": "The SKF 22314 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 70 mm nominal bore, 150 mm outer diameter and 51 mm width (2.756 × 5.906 × 2.008 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 413 kN, C0 430 kN, Pu 45 kN, reference speed 3,400 r/min, limiting speed 4,500 r/min, mass about 5350 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 22314-ek?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 22314-ek?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 70 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 22314-ek driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 22314-ek and 22314?",
        "a": "They share the ISO 15 envelope and the same 413/430 kN ratings, but 22314-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22314 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22314",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 22314; identical ISO 15 envelope, fits H2314 adapter sleeve on a 60 mm shaft."
      },
      {
        "equiv_sku": "C2314",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2314 shares the 70×150×51 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C2314-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2314 K shares the 70×150×51 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22314-EK",
      "SKF 22314 EK",
      "22314 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22215-EK",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22215 EK",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 75,
    "D_mm": 130,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 217,
    "static_load_kN": 240,
    "fatigue_load_limit_kN": 26.5,
    "max_rpm": 6300,
    "reference_speed_rpm": 4800,
    "limiting_speed_rpm": 6300,
    "weight_g": 2450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For sleeve mounting on a 75 mm shaft, SKF order number SKF 22215 EK is the 1:12 tapered-bore spherical roller bearing in the 22200-series family (dimension series 22 (medium OD, wide)); the cylindrical-bore equivalent is a separate order number, 22215. Numbering ties the bearing to its envelope: 22215-ek means spherical-roller type, dimension series 22, 75 mm bore — which is why the 130×31 mm outline swaps dimensionally with other ISO 15 bearings of the same code. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. The 27.5 mm radial section height ((130−75)/2) and 2450 g catalogue mass frame a 75 mm bore bearing rated at 217 kN C — roughly 2.89 kN of dynamic capacity per millimetre of bore before application factors. For shafts with a locating shoulder, use an AH withdrawal sleeve instead of an adapter sleeve: the bearing presses against the shoulder and the sleeve is drawn out for dismounting, making the 22215-ek removable without an induction heater.",
    "applications": [
      "rolling-mill pinion and back-up shafts",
      "large vibrating screens and feeders",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal",
      "stepped shafts fitted with withdrawal sleeves against a fixed shoulder"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Mount the 75 mm bore 22215-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 22200-series series at 75 mm bore (130×31 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 22215-ek to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "The 22215-ek and its cylindrical-bore counterpart 22215 share envelope and load ratings (217/240 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "Shaft and housing fillets must clear the bearing chamfer so the 31 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 217/240 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22215 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22215-ek?",
        "a": "The SKF 22215 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 75 mm nominal bore, 130 mm outer diameter and 31 mm width (2.953 × 5.118 × 1.22 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 217 kN, C0 240 kN, Pu 26.5 kN, reference speed 4,800 r/min, limiting speed 6,300 r/min, mass about 2450 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 22215-ek?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 22215-ek?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 75 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 22215-ek driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 22215-ek and 22215?",
        "a": "They share the ISO 15 envelope and the same 217/240 kN ratings, but 22215-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22215 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22215",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 22215; identical ISO 15 envelope, fits H315 adapter sleeve on a 65 mm shaft."
      },
      {
        "equiv_sku": "C2215",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2215 shares the 75×130×31 mm envelope but catalogue C/C0 differ (196/208 kN vs 217/240 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C2215-K",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2215 K shares the 75×130×31 mm envelope but catalogue C/C0 differ (196/208 kN vs 217/240 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C2215-V",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2215 V shares the 75×130×31 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C2215-KV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2215 KV shares the 75×130×31 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22215-EK",
      "SKF 22215 EK",
      "22215 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21315-EK",
    "brand": "SKF",
    "manufacturer_designation": "SKF 21315 EK",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 75,
    "D_mm": 160,
    "B_mm": 37,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 291,
    "static_load_kN": 325,
    "fatigue_load_limit_kN": 34.5,
    "max_rpm": 5600,
    "reference_speed_rpm": 4000,
    "limiting_speed_rpm": 5600,
    "weight_g": 4500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "21315-ek is the 1:12 tapered-bore execution of the 21300-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 21315, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. Numbering ties the bearing to its envelope: 21315-ek means spherical-roller type, dimension series 13, 75 mm bore — which is why the 160×37 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. Catalogue mass 4500 g for the 75×160×37 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. Because driving up the 1:12 taper consumes radial clearance, K executions are commonly ordered with C3 initial clearance so the residual running clearance after mounting matches the cylindrical-bore 21315 on an interference seat.",
    "applications": [
      "marine propulsion and thruster shafts",
      "cement-mill trunnion and drive shafts",
      "split-housing plummer block arrangements with bearings swapped in situ",
      "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems"
    ],
    "pitfalls": [
      "Mount the 75 mm bore 21315-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 21300-series series at 75 mm bore (160×37 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 37 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "The 21315-ek and its cylindrical-bore counterpart 21315 share envelope and load ratings (291/325 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "Catalogue reference speed and limiting speed are different limits: the 4,000 r/min reference is a thermal criterion under load, while the 5,600 r/min limiting value is the mechanical ceiling — observe both.",
      "The 291/325 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 21315 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21315-ek?",
        "a": "The SKF 21315 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 75 mm nominal bore, 160 mm outer diameter and 37 mm width (2.953 × 6.299 × 1.457 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 291 kN, C0 325 kN, Pu 34.5 kN, reference speed 4,000 r/min, limiting speed 5,600 r/min, mass about 4500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 21315-ek?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 21315-ek?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 75 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 21315-ek driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 21315-ek and 21315?",
        "a": "They share the ISO 15 envelope and the same 291/325 kN ratings, but 21315-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 21315 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21315-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "21315",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 21315; identical ISO 15 envelope, fits H315 adapter sleeve on a 65 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21315-EK",
      "SKF 21315 EK",
      "21315 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22315-EK",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22315 EK",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 75,
    "D_mm": 160,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 462,
    "static_load_kN": 475,
    "fatigue_load_limit_kN": 48,
    "max_rpm": 4300,
    "reference_speed_rpm": 3200,
    "limiting_speed_rpm": 4300,
    "weight_g": 6500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF lists SKF 22315 EK as the adapter-sleeve execution in the 22300-series range: a 75 mm nominal-bore spherical roller bearing whose 1:12 tapered inner ring is driven up a sleeve, with 160 mm OD and 55 mm width to the ISO 15 envelope. Digit by digit, 22315-ek reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 23, and bore reference 15 resolving to 75 mm; 160 mm OD and 55 mm width are the matching ISO 15 boundary values. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. Catalogue mass 6500 g for the 75×160×55 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. Over-driving the 22315-ek up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.",
    "applications": [
      "marine propulsion and thruster shafts",
      "cement-mill trunnion and drive shafts",
      "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat",
      "split-housing plummer block arrangements with bearings swapped in situ"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Mount the 75 mm bore 22315-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 22300-series series at 75 mm bore (160×55 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 4,300 r/min ceiling.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 55 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "The 22315-ek and its cylindrical-bore counterpart 22315 share envelope and load ratings (462/475 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "The 6500 g mass and 55 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 22315-ek.",
      "The 462/475 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22315 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22315-ek?",
        "a": "The SKF 22315 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 75 mm nominal bore, 160 mm outer diameter and 55 mm width (2.953 × 6.299 × 2.165 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 462 kN, C0 475 kN, Pu 48 kN, reference speed 3,200 r/min, limiting speed 4,300 r/min, mass about 6500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 22315-ek?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 22315-ek?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 75 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 22315-ek driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 22315-ek and 22315?",
        "a": "They share the ISO 15 envelope and the same 462/475 kN ratings, but 22315-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22315 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22315",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 22315; identical ISO 15 envelope, fits H2315 adapter sleeve on a 65 mm shaft."
      },
      {
        "equiv_sku": "C2315",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2315 shares the 75×160×55 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C2315-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2315 K shares the 75×160×55 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22315-EK",
      "SKF 22315 EK",
      "22315 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22216-EK",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22216 EK",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 80,
    "D_mm": 140,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 243,
    "static_load_kN": 270,
    "fatigue_load_limit_kN": 29,
    "max_rpm": 6000,
    "reference_speed_rpm": 4300,
    "limiting_speed_rpm": 6000,
    "weight_g": 3000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 22216-ek denotes the tapered-bore version (K suffix, taper 1:12) of the 22200-series spherical roller bearing: dimensioned 80×140×33 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. Reading the designation: the leading 2 marks a spherical roller bearing, the 22 is the ISO 15 dimension series (dimension series 22 (medium OD, wide)), and the last two digits encode the 80 mm bore; the 140 mm OD and 33 mm width follow the ISO 15 general plan. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. Speed planning uses two different ceilings: 4,300 r/min thermal reference and 6,000 r/min mechanical limiting speed. Over-driving the 22216-ek up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.",
    "applications": [
      "paper-machine press and dryer rolls",
      "rolling-mill pinion and back-up shafts",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal",
      "stepped shafts fitted with withdrawal sleeves against a fixed shoulder"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems"
    ],
    "pitfalls": [
      "Mount the 80 mm bore 22216-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 22200-series series at 80 mm bore (140×33 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.",
      "The 22216-ek and its cylindrical-bore counterpart 22216 share envelope and load ratings (243/270 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 80 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 22216-ek with different sleeves.",
      "The 3000 g mass and 33 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 22216-ek.",
      "The 243/270 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22216 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22216-ek?",
        "a": "The SKF 22216 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 80 mm nominal bore, 140 mm outer diameter and 33 mm width (3.15 × 5.512 × 1.299 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 243 kN, C0 270 kN, Pu 29 kN, reference speed 4,300 r/min, limiting speed 6,000 r/min, mass about 3000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 22216-ek?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 22216-ek?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 80 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 22216-ek driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 22216-ek and 22216?",
        "a": "They share the ISO 15 envelope and the same 243/270 kN ratings, but 22216-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22216 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22216",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 22216; identical ISO 15 envelope, fits H316 adapter sleeve on a 70 mm shaft."
      },
      {
        "equiv_sku": "C2216",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2216 shares the 80×140×33 mm envelope but catalogue C/C0 differ (220/250 kN vs 243/270 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C2216-K",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2216 K shares the 80×140×33 mm envelope but catalogue C/C0 differ (220/250 kN vs 243/270 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C2216-V",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2216 V shares the 80×140×33 mm envelope but catalogue C/C0 differ (255/305 kN vs 243/270 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C2216-KV",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2216 KV shares the 80×140×33 mm envelope but catalogue C/C0 differ (255/305 kN vs 243/270 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22216-EK",
      "SKF 22216 EK",
      "22216 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21316-EK",
    "brand": "SKF",
    "manufacturer_designation": "SKF 21316 EK",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 80,
    "D_mm": 170,
    "B_mm": 39,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 331,
    "static_load_kN": 375,
    "fatigue_load_limit_kN": 39,
    "max_rpm": 5300,
    "reference_speed_rpm": 3800,
    "limiting_speed_rpm": 5300,
    "weight_g": 5300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For sleeve mounting on a 80 mm shaft, SKF order number SKF 21316 EK is the 1:12 tapered-bore spherical roller bearing in the 21300-series family (dimension series 13 (heavy OD, normal width)); the cylindrical-bore equivalent is a separate order number, 21316. Reading the designation: the leading 2 marks a spherical roller bearing, the 13 is the ISO 15 dimension series (dimension series 13 (heavy OD, normal width)), and the last two digits encode the 80 mm bore; the 170 mm OD and 39 mm width follow the ISO 15 general plan. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. Catalogue mass 5300 g for the 80×170×39 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. Because driving up the 1:12 taper consumes radial clearance, K executions are commonly ordered with C3 initial clearance so the residual running clearance after mounting matches the cylindrical-bore 21316 on an interference seat.",
    "applications": [
      "marine propulsion and thruster shafts",
      "cement-mill trunnion and drive shafts",
      "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Mount the 80 mm bore 21316-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 21300-series series at 80 mm bore (170×39 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 80 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 21316-ek with different sleeves.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 39 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 331/375 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 21316 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21316-ek?",
        "a": "The SKF 21316 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 80 mm nominal bore, 170 mm outer diameter and 39 mm width (3.15 × 6.693 × 1.535 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 331 kN, C0 375 kN, Pu 39 kN, reference speed 3,800 r/min, limiting speed 5,300 r/min, mass about 5300 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 21316-ek?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 21316-ek?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 80 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 21316-ek driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 21316-ek and 21316?",
        "a": "They share the ISO 15 envelope and the same 331/375 kN ratings, but 21316-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 21316 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21316-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "21316",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 21316; identical ISO 15 envelope, fits H316 adapter sleeve on a 70 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21316-EK",
      "SKF 21316 EK",
      "21316 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22316-EK",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22316 EK",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 80,
    "D_mm": 170,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 516,
    "static_load_kN": 530,
    "fatigue_load_limit_kN": 54,
    "max_rpm": 4000,
    "reference_speed_rpm": 3000,
    "limiting_speed_rpm": 4000,
    "weight_g": 7650,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The SKF 22316 EK is a 80×170×58 mm spherical roller bearing with a 1:12 tapered bore — SKF catalogue execution for sleeve mounting on a 80 mm plain shaft, retaining the double-row self-aligning barrel-roller design. The code breaks down as type digit 2 (double-row spherical roller), dimension series 23 (dimension series 23 (heavy OD, wide)), and bore code 16 = 80 mm; dimensions 80×170×58 mm therefore match the ISO 15 envelope. Reading the suffix on 22316-ek, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 22316. With C 516 kN and C0 530 kN, the 22316-ek load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. On an H adapter sleeve the 80 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 22316-ek inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.",
    "applications": [
      "large vibrating screens and feeders",
      "marine propulsion and thruster shafts",
      "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat",
      "split-housing plummer block arrangements with bearings swapped in situ"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Mount the 80 mm bore 22316-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 22300-series series at 80 mm bore (170×58 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 4,000 r/min ceiling.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 80 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 22316-ek with different sleeves.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 80 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 22316-ek with different sleeves.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 22316-ek; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 516/530 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22316 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22316-ek?",
        "a": "The SKF 22316 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 80 mm nominal bore, 170 mm outer diameter and 58 mm width (3.15 × 6.693 × 2.283 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 516 kN, C0 530 kN, Pu 54 kN, reference speed 3,000 r/min, limiting speed 4,000 r/min, mass about 7650 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 22316-ek?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 22316-ek?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 80 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 22316-ek driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 22316-ek and 22316?",
        "a": "They share the ISO 15 envelope and the same 516/530 kN ratings, but 22316-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22316 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22316",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 22316; identical ISO 15 envelope, fits H2316 adapter sleeve on a 70 mm shaft."
      },
      {
        "equiv_sku": "C2316",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2316 shares the 80×170×58 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C2316-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2316 K shares the 80×170×58 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22316-EK",
      "SKF 22316 EK",
      "22316 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22217-EK",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22217 EK",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 85,
    "D_mm": 150,
    "B_mm": 36,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 291,
    "static_load_kN": 325,
    "fatigue_load_limit_kN": 34.5,
    "max_rpm": 5600,
    "reference_speed_rpm": 4000,
    "limiting_speed_rpm": 5600,
    "weight_g": 3700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22217-ek is the 1:12 tapered-bore execution of the 22200-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 22217, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. On the SKF nameplate, 22217-ek follows the ISO 15 convention: 2 for the spherical roller type, 22 for the dimension series 22 (medium OD, wide), final digits 17 for the 85 mm bore. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. Selection arithmetic: the C0/C ratio is about 1.12 (static 325 kN against dynamic 291 kN), typical of a spherical roller sized for heavy combined loads, and the 34.5 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. On an H adapter sleeve the 85 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 22217-ek inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.",
    "applications": [
      "jaw and cone crusher main shafts",
      "paper-machine press and dryer rolls",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal",
      "stepped shafts fitted with withdrawal sleeves against a fixed shoulder"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still"
    ],
    "pitfalls": [
      "Mount the 85 mm bore 22217-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 22200-series series at 85 mm bore (150×36 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 36 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "The 22217-ek and its cylindrical-bore counterpart 22217 share envelope and load ratings (291/325 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 22217-ek; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 291/325 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22217 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22217-ek?",
        "a": "The SKF 22217 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 85 mm nominal bore, 150 mm outer diameter and 36 mm width (3.346 × 5.906 × 1.417 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 291 kN, C0 325 kN, Pu 34.5 kN, reference speed 4,000 r/min, limiting speed 5,600 r/min, mass about 3700 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 22217-ek?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 22217-ek?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 85 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 22217-ek driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 22217-ek and 22217?",
        "a": "They share the ISO 15 envelope and the same 291/325 kN ratings, but 22217-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22217 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22217",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 22217; identical ISO 15 envelope, fits H317 adapter sleeve on a 75 mm shaft."
      },
      {
        "equiv_sku": "C2217",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2217 shares the 85×150×36 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C2217-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2217 K shares the 85×150×36 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22217-EK",
      "SKF 22217 EK",
      "22217 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21317-EK",
    "brand": "SKF",
    "manufacturer_designation": "SKF 21317 EK",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 85,
    "D_mm": 180,
    "B_mm": 41,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 331,
    "static_load_kN": 375,
    "fatigue_load_limit_kN": 39,
    "max_rpm": 5300,
    "reference_speed_rpm": 3800,
    "limiting_speed_rpm": 5300,
    "weight_g": 6200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 21317-ek denotes the tapered-bore version (K suffix, taper 1:12) of the 21300-series spherical roller bearing: dimensioned 85×180×41 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. On the SKF nameplate, 21317-ek follows the ISO 15 convention: 2 for the spherical roller type, 13 for the dimension series 13 (heavy OD, normal width), final digits 17 for the 85 mm bore. Reading the suffix on 21317-ek, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 21317. With C 331 kN and C0 375 kN, the 21317-ek load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. After drive-up, re-check radial clearance and then swing the outer ring through its self-aligning range: the sphered raceway of the 21317-ek must still tilt ≈ 0.5–2.5° freely — a joint that binds after sleeve mounting signals excessive drive-up or a cocked sleeve.",
    "applications": [
      "large vibrating screens and feeders",
      "marine propulsion and thruster shafts",
      "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Mount the 85 mm bore 21317-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 21300-series series at 85 mm bore (180×41 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 21317-ek to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 21317-ek to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "Catalogue reference speed and limiting speed are different limits: the 3,800 r/min reference is a thermal criterion under load, while the 5,300 r/min limiting value is the mechanical ceiling — observe both.",
      "The 331/375 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 21317 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21317-ek?",
        "a": "The SKF 21317 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 85 mm nominal bore, 180 mm outer diameter and 41 mm width (3.346 × 7.087 × 1.614 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 331 kN, C0 375 kN, Pu 39 kN, reference speed 3,800 r/min, limiting speed 5,300 r/min, mass about 6200 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 21317-ek?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 21317-ek?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 85 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 21317-ek driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 21317-ek and 21317?",
        "a": "They share the ISO 15 envelope and the same 331/375 kN ratings, but 21317-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 21317 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21317-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "21317",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 21317; identical ISO 15 envelope, fits H317 adapter sleeve on a 75 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21317-EK",
      "SKF 21317 EK",
      "21317 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22317-EK",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22317 EK",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 85,
    "D_mm": 180,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 577,
    "static_load_kN": 620,
    "fatigue_load_limit_kN": 61,
    "max_rpm": 3800,
    "reference_speed_rpm": 2800,
    "limiting_speed_rpm": 3800,
    "weight_g": 8850,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF 22317 EK in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:12), intended for an H-series adapter sleeve or AH withdrawal sleeve, with two pressed-steel cages with a floating guide ring and the same 85×180×60 mm ISO 15 outline as its cylindrical-bore counterpart. Numbering ties the bearing to its envelope: 22317-ek means spherical-roller type, dimension series 23, 85 mm bore — which is why the 180×60 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. With C 577 kN and C0 620 kN, the 22317-ek load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. On an H adapter sleeve the 85 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 22317-ek inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.",
    "applications": [
      "large vibrating screens and feeders",
      "marine propulsion and thruster shafts",
      "split-housing plummer block arrangements with bearings swapped in situ",
      "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Mount the 85 mm bore 22317-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 22300-series series at 85 mm bore (180×60 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 3,800 r/min ceiling.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 22317-ek to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 22317-ek to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "The 8850 g mass and 60 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 22317-ek.",
      "The 577/620 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22317 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22317-ek?",
        "a": "The SKF 22317 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 85 mm nominal bore, 180 mm outer diameter and 60 mm width (3.346 × 7.087 × 2.362 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 577 kN, C0 620 kN, Pu 61 kN, reference speed 2,800 r/min, limiting speed 3,800 r/min, mass about 8850 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 22317-ek?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 22317-ek?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 85 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 22317-ek driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 22317-ek and 22317?",
        "a": "They share the ISO 15 envelope and the same 577/620 kN ratings, but 22317-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22317 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22317",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 22317; identical ISO 15 envelope, fits H2317 adapter sleeve on a 75 mm shaft."
      },
      {
        "equiv_sku": "C2317",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2317 shares the 85×180×60 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C2317-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2317 K shares the 85×180×60 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22317-EK",
      "SKF 22317 EK",
      "22317 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22218-EK",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22218 EK",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 90,
    "D_mm": 160,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 331,
    "static_load_kN": 375,
    "fatigue_load_limit_kN": 39,
    "max_rpm": 5300,
    "reference_speed_rpm": 3800,
    "limiting_speed_rpm": 5300,
    "weight_g": 4550,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For sleeve mounting on a 90 mm shaft, SKF order number SKF 22218 EK is the 1:12 tapered-bore spherical roller bearing in the 22200-series family (dimension series 22 (medium OD, wide)); the cylindrical-bore equivalent is a separate order number, 22218. Digit by digit, 22218-ek reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 22, and bore reference 18 resolving to 90 mm; 160 mm OD and 40 mm width are the matching ISO 15 boundary values. Reading the suffix on 22218-ek, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 22218. Selection arithmetic: the C0/C ratio is about 1.13 (static 375 kN against dynamic 331 kN), typical of a spherical roller sized for heavy combined loads, and the 39 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. On an H adapter sleeve the 90 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 22218-ek inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.",
    "applications": [
      "jaw and cone crusher main shafts",
      "paper-machine press and dryer rolls",
      "stepped shafts fitted with withdrawal sleeves against a fixed shoulder",
      "fan and pulley shafts that need periodic bearing removal in the field"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Mount the 90 mm bore 22218-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 22200-series series at 90 mm bore (160×40 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 90 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 22218-ek with different sleeves.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 40 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "The 4550 g mass and 40 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 22218-ek.",
      "The 331/375 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22218 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22218-ek?",
        "a": "The SKF 22218 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 90 mm nominal bore, 160 mm outer diameter and 40 mm width (3.543 × 6.299 × 1.575 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 331 kN, C0 375 kN, Pu 39 kN, reference speed 3,800 r/min, limiting speed 5,300 r/min, mass about 4550 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 22218-ek?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 22218-ek?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 90 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 22218-ek driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 22218-ek and 22218?",
        "a": "They share the ISO 15 envelope and the same 331/375 kN ratings, but 22218-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22218 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22218",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 22218; identical ISO 15 envelope, fits H318 adapter sleeve on a 80 mm shaft."
      },
      {
        "equiv_sku": "C2218",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2218 shares the 90×160×40 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C2218-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2218 K shares the 90×160×40 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22218-EK",
      "SKF 22218 EK",
      "22218 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23218-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23218 CCK/W33",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 90,
    "D_mm": 160,
    "B_mm": 52.4,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 372,
    "static_load_kN": 440,
    "fatigue_load_limit_kN": 48,
    "max_rpm": 3800,
    "reference_speed_rpm": 2800,
    "limiting_speed_rpm": 3800,
    "weight_g": 6000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF lists SKF 23218 CCK/W33 as the adapter-sleeve execution in the 23200-series range: a 90 mm nominal-bore spherical roller bearing whose 1:12 tapered inner ring is driven up a sleeve, with 160 mm OD and 52.4 mm width to the ISO 15 envelope. Reading the designation: the leading 2 marks a spherical roller bearing, the 32 is the ISO 15 dimension series (dimension series 32 (medium OD, extra wide)), and the last two digits encode the 90 mm bore; the 160 mm OD and 52.4 mm width follow the ISO 15 general plan. Reading the suffix on 23218-cck-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 23218-cc-w33. Selection arithmetic: the C0/C ratio is about 1.18 (static 440 kN against dynamic 372 kN), typical of a spherical roller sized for heavy combined loads, and the 48 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Over-driving the 23218-cck-w33 up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.",
    "applications": [
      "jaw and cone crusher main shafts",
      "paper-machine press and dryer rolls",
      "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat",
      "split-housing plummer block arrangements with bearings swapped in situ"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Mount the 90 mm bore 23218-cck-w33 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 23200-series series at 90 mm bore (160×52.4 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 52.4 mm width changes abutment spacing, even though the 160 mm OD matches.",
      "The 23218-cck-w33 and its cylindrical-bore counterpart 23218-cc-w33 share envelope and load ratings (372/440 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 90 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23218-cck-w33 with different sleeves.",
      "Shaft and housing fillets must clear the bearing chamfer so the 52.4 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 372/440 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23218 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23218-cck-w33?",
        "a": "The SKF 23218 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 90 mm nominal bore, 160 mm outer diameter and 52.4 mm width (3.543 × 6.299 × 2.063 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 372 kN, C0 440 kN, Pu 48 kN, reference speed 2,800 r/min, limiting speed 3,800 r/min, mass about 6000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23218-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23218-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 90 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23218-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23218-cck-w33 and 23218-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 372/440 kN ratings, but 23218-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23218-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23218",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23218; identical ISO 15 envelope, fits H2318 adapter sleeve on a 80 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23218-CCK-W33",
      "SKF 23218 CCK/W33",
      "23218 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21318-EK",
    "brand": "SKF",
    "manufacturer_designation": "SKF 21318 EK",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 90,
    "D_mm": 190,
    "B_mm": 43,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 393,
    "static_load_kN": 450,
    "fatigue_load_limit_kN": 45.5,
    "max_rpm": 4800,
    "reference_speed_rpm": 3600,
    "limiting_speed_rpm": 4800,
    "weight_g": 7250,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "21318-ek is the 1:12 tapered-bore execution of the 21300-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 21318, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. Digit by digit, 21318-ek reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 13, and bore reference 18 resolving to 90 mm; 190 mm OD and 43 mm width are the matching ISO 15 boundary values. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. The 50.0 mm radial section height ((190−90)/2) and 7250 g catalogue mass frame a 90 mm bore bearing rated at 393 kN C — roughly 4.37 kN of dynamic capacity per millimetre of bore before application factors. At 90 mm bore, dismount after service is by KM locknut reversal or a hydraulic nut on larger sizes; oil-injection grooves on the bigger sleeves let pressurised oil float the 21318-ek off the taper without scoring either surface.",
    "applications": [
      "rolling-mill pinion and back-up shafts",
      "large vibrating screens and feeders",
      "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals"
    ],
    "pitfalls": [
      "Mount the 90 mm bore 21318-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 21300-series series at 90 mm bore (190×43 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.",
      "The 21318-ek and its cylindrical-bore counterpart 21318 share envelope and load ratings (393/450 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 43 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 21318-ek pits long before its L10 life.",
      "The 393/450 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 21318 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21318-ek?",
        "a": "The SKF 21318 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 90 mm nominal bore, 190 mm outer diameter and 43 mm width (3.543 × 7.48 × 1.693 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 393 kN, C0 450 kN, Pu 45.5 kN, reference speed 3,600 r/min, limiting speed 4,800 r/min, mass about 7250 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 21318-ek?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 21318-ek?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 90 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 21318-ek driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 21318-ek and 21318?",
        "a": "They share the ISO 15 envelope and the same 393/450 kN ratings, but 21318-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 21318 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21318-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "21318",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 21318; identical ISO 15 envelope, fits H318 adapter sleeve on a 80 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21318-EK",
      "SKF 21318 EK",
      "21318 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22318-EK",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22318 EK",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 90,
    "D_mm": 190,
    "B_mm": 64,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 637,
    "static_load_kN": 695,
    "fatigue_load_limit_kN": 67,
    "max_rpm": 3600,
    "reference_speed_rpm": 2600,
    "limiting_speed_rpm": 3600,
    "weight_g": 10500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF lists SKF 22318 EK as the adapter-sleeve execution in the 22300-series range: a 90 mm nominal-bore spherical roller bearing whose 1:12 tapered inner ring is driven up a sleeve, with 190 mm OD and 64 mm width to the ISO 15 envelope. Reading the designation: the leading 2 marks a spherical roller bearing, the 23 is the ISO 15 dimension series (dimension series 23 (heavy OD, wide)), and the last two digits encode the 90 mm bore; the 190 mm OD and 64 mm width follow the ISO 15 general plan. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. The 50.0 mm radial section height ((190−90)/2) and 10500 g catalogue mass frame a 90 mm bore bearing rated at 637 kN C — roughly 7.08 kN of dynamic capacity per millimetre of bore before application factors. Mounting on the 1:12 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 90 mm 22318-ek, checked with feeler gauges before and after drive-up.",
    "applications": [
      "rolling-mill pinion and back-up shafts",
      "large vibrating screens and feeders",
      "split-housing plummer block arrangements with bearings swapped in situ",
      "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Mount the 90 mm bore 22318-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 22300-series series at 90 mm bore (190×64 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 3,600 r/min ceiling.",
      "The 22318-ek and its cylindrical-bore counterpart 22318 share envelope and load ratings (637/695 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 64 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 22318-ek; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 637/695 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22318 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22318-ek?",
        "a": "The SKF 22318 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 90 mm nominal bore, 190 mm outer diameter and 64 mm width (3.543 × 7.48 × 2.52 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 637 kN, C0 695 kN, Pu 67 kN, reference speed 2,600 r/min, limiting speed 3,600 r/min, mass about 10500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 22318-ek?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 22318-ek?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 90 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 22318-ek driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 22318-ek and 22318?",
        "a": "They share the ISO 15 envelope and the same 637/695 kN ratings, but 22318-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22318 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22318",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 22318; identical ISO 15 envelope, fits H2318 adapter sleeve on a 80 mm shaft."
      },
      {
        "equiv_sku": "C2318",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2318 shares the 90×190×64 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C2318-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2318 K shares the 90×190×64 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22318-EK",
      "SKF 22318 EK",
      "22318 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22219-EK",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22219 EK",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 95,
    "D_mm": 170,
    "B_mm": 43,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 393,
    "static_load_kN": 450,
    "fatigue_load_limit_kN": 45.5,
    "max_rpm": 4800,
    "reference_speed_rpm": 3600,
    "limiting_speed_rpm": 4800,
    "weight_g": 5450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 22219-ek denotes the tapered-bore version (K suffix, taper 1:12) of the 22200-series spherical roller bearing: dimensioned 95×170×43 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. The code breaks down as type digit 2 (double-row spherical roller), dimension series 22 (dimension series 22 (medium OD, wide)), and bore code 19 = 95 mm; dimensions 95×170×43 mm therefore match the ISO 15 envelope. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. At 3,600 r/min reference speed the 37.5 mm-section 22219-ek is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 4,800 r/min as the mechanical ceiling. Mounting on the 1:12 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 95 mm 22219-ek, checked with feeler gauges before and after drive-up.",
    "applications": [
      "heavy conveyor head shafts in mining",
      "jaw and cone crusher main shafts",
      "stepped shafts fitted with withdrawal sleeves against a fixed shoulder",
      "fan and pulley shafts that need periodic bearing removal in the field"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals"
    ],
    "pitfalls": [
      "Mount the 95 mm bore 22219-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 22200-series series at 95 mm bore (170×43 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 22219-ek to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 22219-ek to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 22219-ek; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 393/450 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22219 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22219-ek?",
        "a": "The SKF 22219 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 95 mm nominal bore, 170 mm outer diameter and 43 mm width (3.74 × 6.693 × 1.693 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 393 kN, C0 450 kN, Pu 45.5 kN, reference speed 3,600 r/min, limiting speed 4,800 r/min, mass about 5450 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 22219-ek?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 22219-ek?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 95 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 22219-ek driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 22219-ek and 22219?",
        "a": "They share the ISO 15 envelope and the same 393/450 kN ratings, but 22219-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22219 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22219",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 22219; identical ISO 15 envelope, fits H319 adapter sleeve on a 85 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22219-EK",
      "SKF 22219 EK",
      "22219 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21319-EK",
    "brand": "SKF",
    "manufacturer_designation": "SKF 21319 EK",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 95,
    "D_mm": 200,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 433,
    "static_load_kN": 490,
    "fatigue_load_limit_kN": 49,
    "max_rpm": 4500,
    "reference_speed_rpm": 3400,
    "limiting_speed_rpm": 4500,
    "weight_g": 8250,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For sleeve mounting on a 95 mm shaft, SKF order number SKF 21319 EK is the 1:12 tapered-bore spherical roller bearing in the 21300-series family (dimension series 13 (heavy OD, normal width)); the cylindrical-bore equivalent is a separate order number, 21319. The code breaks down as type digit 2 (double-row spherical roller), dimension series 13 (dimension series 13 (heavy OD, normal width)), and bore code 19 = 95 mm; dimensions 95×200×45 mm therefore match the ISO 15 envelope. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. The 52.5 mm radial section height ((200−95)/2) and 8250 g catalogue mass frame a 95 mm bore bearing rated at 433 kN C — roughly 4.56 kN of dynamic capacity per millimetre of bore before application factors. At 95 mm bore, dismount after service is by KM locknut reversal or a hydraulic nut on larger sizes; oil-injection grooves on the bigger sleeves let pressurised oil float the 21319-ek off the taper without scoring either surface.",
    "applications": [
      "rolling-mill pinion and back-up shafts",
      "large vibrating screens and feeders",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal",
      "stepped shafts fitted with withdrawal sleeves against a fixed shoulder"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Mount the 95 mm bore 21319-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 21300-series series at 95 mm bore (200×45 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 45 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 95 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 21319-ek with different sleeves.",
      "Catalogue reference speed and limiting speed are different limits: the 3,400 r/min reference is a thermal criterion under load, while the 4,500 r/min limiting value is the mechanical ceiling — observe both.",
      "The 433/490 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 21319 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21319-ek?",
        "a": "The SKF 21319 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 95 mm nominal bore, 200 mm outer diameter and 45 mm width (3.74 × 7.874 × 1.772 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 433 kN, C0 490 kN, Pu 49 kN, reference speed 3,400 r/min, limiting speed 4,500 r/min, mass about 8250 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 21319-ek?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 21319-ek?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 95 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 21319-ek driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 21319-ek and 21319?",
        "a": "They share the ISO 15 envelope and the same 433/490 kN ratings, but 21319-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 21319 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21319-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×200×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "21319",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 21319; identical ISO 15 envelope, fits H319 adapter sleeve on a 85 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21319-EK",
      "SKF 21319 EK",
      "21319 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22319-EK",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22319 EK",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 95,
    "D_mm": 200,
    "B_mm": 67,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 699,
    "static_load_kN": 765,
    "fatigue_load_limit_kN": 73.5,
    "max_rpm": 3400,
    "reference_speed_rpm": 2600,
    "limiting_speed_rpm": 3400,
    "weight_g": 12000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The SKF 22319 EK is a 95×200×67 mm spherical roller bearing with a 1:12 tapered bore — SKF catalogue execution for sleeve mounting on a 95 mm plain shaft, retaining the double-row self-aligning barrel-roller design. On the SKF nameplate, 22319-ek follows the ISO 15 convention: 2 for the spherical roller type, 23 for the dimension series 23 (heavy OD, wide), final digits 19 for the 95 mm bore. Reading the suffix on 22319-ek, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 22319. The 52.5 mm radial section height ((200−95)/2) and 12000 g catalogue mass frame a 95 mm bore bearing rated at 699 kN C — roughly 7.36 kN of dynamic capacity per millimetre of bore before application factors. Mounting on the 1:12 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 95 mm 22319-ek, checked with feeler gauges before and after drive-up.",
    "applications": [
      "rolling-mill pinion and back-up shafts",
      "large vibrating screens and feeders",
      "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "smearing on the roller-raceway contact during skid starts below the minimum load"
    ],
    "pitfalls": [
      "Mount the 95 mm bore 22319-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 22300-series series at 95 mm bore (200×67 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 3,400 r/min ceiling.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 67 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 95 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 22319-ek with different sleeves.",
      "The 12000 g mass and 67 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 22319-ek.",
      "The 699/765 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22319 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22319-ek?",
        "a": "The SKF 22319 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 95 mm nominal bore, 200 mm outer diameter and 67 mm width (3.74 × 7.874 × 2.638 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 699 kN, C0 765 kN, Pu 73.5 kN, reference speed 2,600 r/min, limiting speed 3,400 r/min, mass about 12000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 22319-ek?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 22319-ek?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 95 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 22319-ek driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 22319-ek and 22319?",
        "a": "They share the ISO 15 envelope and the same 699/765 kN ratings, but 22319-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22319 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22319",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 22319; identical ISO 15 envelope, fits H2319 adapter sleeve on a 85 mm shaft."
      },
      {
        "equiv_sku": "C2319",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2319 shares the 95×200×67 mm envelope but catalogue C/C0 differ (610/695 kN vs 699/765 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C2319-K",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2319 K shares the 95×200×67 mm envelope but catalogue C/C0 differ (610/695 kN vs 699/765 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22319-EK",
      "SKF 22319 EK",
      "22319 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23120-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23120 CCK/W33",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 100,
    "D_mm": 165,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 385,
    "static_load_kN": 490,
    "fatigue_load_limit_kN": 53,
    "max_rpm": 4000,
    "reference_speed_rpm": 3000,
    "limiting_speed_rpm": 4000,
    "weight_g": 6150,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF 23120 CCK/W33 in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:12), intended for an H-series adapter sleeve or AH withdrawal sleeve, with two pressed-steel cages with a floating guide ring and the same 100×165×52 mm ISO 15 outline as its cylindrical-bore counterpart. Reading the designation: the leading 2 marks a spherical roller bearing, the 31 is the ISO 15 dimension series (dimension series 31 (medium OD, wide)), and the last two digits encode the 100 mm bore; the 165 mm OD and 52 mm width follow the ISO 15 general plan. Reading the suffix on 23120-cck-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 23120-cc-w33. Speed planning uses two different ceilings: 3,000 r/min thermal reference and 4,000 r/min mechanical limiting speed. Over-driving the 23120-cck-w33 up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.",
    "applications": [
      "paper-machine press and dryer rolls",
      "rolling-mill pinion and back-up shafts",
      "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat",
      "split-housing plummer block arrangements with bearings swapped in situ"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "smearing on the roller-raceway contact during skid starts below the minimum load"
    ],
    "pitfalls": [
      "Mount the 100 mm bore 23120-cck-w33 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 23100-series series at 100 mm bore (165×52 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23120-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "The 23120-cck-w33 and its cylindrical-bore counterpart 23120-cc-w33 share envelope and load ratings (385/490 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 385/490 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23120 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23120-cck-w33?",
        "a": "The SKF 23120 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 100 mm nominal bore, 165 mm outer diameter and 52 mm width (3.937 × 6.496 × 2.047 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 385 kN, C0 490 kN, Pu 53 kN, reference speed 3,000 r/min, limiting speed 4,000 r/min, mass about 6150 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23120-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23120-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 100 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23120-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23120-cck-w33 and 23120-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 385/490 kN ratings, but 23120-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23120-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23120",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23120; identical ISO 15 envelope, fits H3120 adapter sleeve on a 90 mm shaft."
      },
      {
        "equiv_sku": "C3120-V",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 3120 V shares the 100×165×52 mm envelope but catalogue C/C0 differ (475/655 kN vs 385/490 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23120-CCK-W33",
      "SKF 23120 CCK/W33",
      "23120 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22220-EK",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22220 EK",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 100,
    "D_mm": 180,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 433,
    "static_load_kN": 490,
    "fatigue_load_limit_kN": 49,
    "max_rpm": 4500,
    "reference_speed_rpm": 3400,
    "limiting_speed_rpm": 4500,
    "weight_g": 6400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The SKF 22220 EK is a 100×180×46 mm spherical roller bearing with a 1:12 tapered bore — SKF catalogue execution for sleeve mounting on a 100 mm plain shaft, retaining the double-row self-aligning barrel-roller design. The code breaks down as type digit 2 (double-row spherical roller), dimension series 22 (dimension series 22 (medium OD, wide)), and bore code 20 = 100 mm; dimensions 100×180×46 mm therefore match the ISO 15 envelope. Reading the suffix on 22220-ek, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 22220. Selection arithmetic: the C0/C ratio is about 1.13 (static 490 kN against dynamic 433 kN), typical of a spherical roller sized for heavy combined loads, and the 49 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Over-driving the 22220-ek up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.",
    "applications": [
      "jaw and cone crusher main shafts",
      "paper-machine press and dryer rolls",
      "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat",
      "split-housing plummer block arrangements with bearings swapped in situ"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "smearing on the roller-raceway contact during skid starts below the minimum load"
    ],
    "pitfalls": [
      "Mount the 100 mm bore 22220-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 22200-series series at 100 mm bore (180×46 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 46 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 100 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 22220-ek with different sleeves.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 433/490 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22220 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22220-ek?",
        "a": "The SKF 22220 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 100 mm nominal bore, 180 mm outer diameter and 46 mm width (3.937 × 7.087 × 1.811 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 433 kN, C0 490 kN, Pu 49 kN, reference speed 3,400 r/min, limiting speed 4,500 r/min, mass about 6400 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 22220-ek?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 22220-ek?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 100 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 22220-ek driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 22220-ek and 22220?",
        "a": "They share the ISO 15 envelope and the same 433/490 kN ratings, but 22220-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22220 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22220",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 22220; identical ISO 15 envelope, fits H320 adapter sleeve on a 90 mm shaft."
      },
      {
        "equiv_sku": "C2220",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2220 shares the 100×180×46 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C2220-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2220 K shares the 100×180×46 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22220-EK",
      "SKF 22220 EK",
      "22220 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23220-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23220 CCK/W33",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 100,
    "D_mm": 180,
    "B_mm": 60.3,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 498,
    "static_load_kN": 600,
    "fatigue_load_limit_kN": 63,
    "max_rpm": 3400,
    "reference_speed_rpm": 2400,
    "limiting_speed_rpm": 3400,
    "weight_g": 8750,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF 23220 CCK/W33 in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:12), intended for an H-series adapter sleeve or AH withdrawal sleeve, with two pressed-steel cages with a floating guide ring and the same 100×180×60.3 mm ISO 15 outline as its cylindrical-bore counterpart. Digit by digit, 23220-cck-w33 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 32, and bore reference 20 resolving to 100 mm; 180 mm OD and 60.3 mm width are the matching ISO 15 boundary values. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. At 2,400 r/min reference speed the 40.0 mm-section 23220-cck-w33 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 3,400 r/min as the mechanical ceiling. At 100 mm bore, dismount after service is by KM locknut reversal or a hydraulic nut on larger sizes; oil-injection grooves on the bigger sleeves let pressurised oil float the 23220-cck-w33 off the taper without scoring either surface.",
    "applications": [
      "heavy conveyor head shafts in mining",
      "jaw and cone crusher main shafts",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal",
      "stepped shafts fitted with withdrawal sleeves against a fixed shoulder"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Mount the 100 mm bore 23220-cck-w33 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 23200-series series at 100 mm bore (180×60.3 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 60.3 mm width changes abutment spacing, even though the 180 mm OD matches.",
      "The 23220-cck-w33 and its cylindrical-bore counterpart 23220-cc-w33 share envelope and load ratings (498/600 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23220-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "Shaft and housing fillets must clear the bearing chamfer so the 60.3 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 498/600 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23220 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23220-cck-w33?",
        "a": "The SKF 23220 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 100 mm nominal bore, 180 mm outer diameter and 60.3 mm width (3.937 × 7.087 × 2.374 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 498 kN, C0 600 kN, Pu 63 kN, reference speed 2,400 r/min, limiting speed 3,400 r/min, mass about 8750 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23220-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23220-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 100 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23220-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23220-cck-w33 and 23220-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 498/600 kN ratings, but 23220-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23220-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23220",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23220; identical ISO 15 envelope, fits H2320 adapter sleeve on a 90 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23220-CCK-W33",
      "SKF 23220 CCK/W33",
      "23220 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21320-EK",
    "brand": "SKF",
    "manufacturer_designation": "SKF 21320 EK",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 100,
    "D_mm": 215,
    "B_mm": 47,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 433,
    "static_load_kN": 490,
    "fatigue_load_limit_kN": 49,
    "max_rpm": 4500,
    "reference_speed_rpm": 3400,
    "limiting_speed_rpm": 4500,
    "weight_g": 10500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 21320-ek denotes the tapered-bore version (K suffix, taper 1:12) of the 21300-series spherical roller bearing: dimensioned 100×215×47 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. Digit by digit, 21320-ek reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 13, and bore reference 20 resolving to 100 mm; 215 mm OD and 47 mm width are the matching ISO 15 boundary values. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. With C 433 kN and C0 490 kN, the 21320-ek load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. Over-driving the 21320-ek up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.",
    "applications": [
      "large vibrating screens and feeders",
      "marine propulsion and thruster shafts",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal",
      "stepped shafts fitted with withdrawal sleeves against a fixed shoulder"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Mount the 100 mm bore 21320-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 21300-series series at 100 mm bore (215×47 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 100 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 21320-ek with different sleeves.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 100 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 21320-ek with different sleeves.",
      "Shaft and housing fillets must clear the bearing chamfer so the 47 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 433/490 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 21320 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21320-ek?",
        "a": "The SKF 21320 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 100 mm nominal bore, 215 mm outer diameter and 47 mm width (3.937 × 8.465 × 1.85 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 433 kN, C0 490 kN, Pu 49 kN, reference speed 3,400 r/min, limiting speed 4,500 r/min, mass about 10500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 21320-ek?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 21320-ek?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 100 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 21320-ek driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 21320-ek and 21320?",
        "a": "They share the ISO 15 envelope and the same 433/490 kN ratings, but 21320-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 21320 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21320-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "21320",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 21320; identical ISO 15 envelope, fits H320 adapter sleeve on a 90 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21320-EK",
      "SKF 21320 EK",
      "21320 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22320-EK",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22320 EK",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 100,
    "D_mm": 215,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 847,
    "static_load_kN": 950,
    "fatigue_load_limit_kN": 88,
    "max_rpm": 3000,
    "reference_speed_rpm": 2400,
    "limiting_speed_rpm": 3000,
    "weight_g": 15000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF 22320 EK in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:12), intended for an H-series adapter sleeve or AH withdrawal sleeve, with two pressed-steel cages with a floating guide ring and the same 100×215×73 mm ISO 15 outline as its cylindrical-bore counterpart. Reading the designation: the leading 2 marks a spherical roller bearing, the 23 is the ISO 15 dimension series (dimension series 23 (heavy OD, wide)), and the last two digits encode the 100 mm bore; the 215 mm OD and 73 mm width follow the ISO 15 general plan. Reading the suffix on 22320-ek, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 22320. With C 847 kN and C0 950 kN, the 22320-ek load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. After drive-up, re-check radial clearance and then swing the outer ring through its self-aligning range: the sphered raceway of the 22320-ek must still tilt ≈ 0.5–2.5° freely — a joint that binds after sleeve mounting signals excessive drive-up or a cocked sleeve.",
    "applications": [
      "large vibrating screens and feeders",
      "marine propulsion and thruster shafts",
      "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "smearing on the roller-raceway contact during skid starts below the minimum load"
    ],
    "pitfalls": [
      "Mount the 100 mm bore 22320-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 22300-series series at 100 mm bore (215×73 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 3,000 r/min ceiling.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 100 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 22320-ek with different sleeves.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 100 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 22320-ek with different sleeves.",
      "Catalogue reference speed and limiting speed are different limits: the 2,400 r/min reference is a thermal criterion under load, while the 3,000 r/min limiting value is the mechanical ceiling — observe both.",
      "The 847/950 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22320 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22320-ek?",
        "a": "The SKF 22320 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 100 mm nominal bore, 215 mm outer diameter and 73 mm width (3.937 × 8.465 × 2.874 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 847 kN, C0 950 kN, Pu 88 kN, reference speed 2,400 r/min, limiting speed 3,000 r/min, mass about 15000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 22320-ek?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 22320-ek?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 100 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 22320-ek driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 22320-ek and 22320?",
        "a": "They share the ISO 15 envelope and the same 847/950 kN ratings, but 22320-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22320 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22320",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 22320; identical ISO 15 envelope, fits H2320 adapter sleeve on a 90 mm shaft."
      },
      {
        "equiv_sku": "C2320",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2320 shares the 100×215×73 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C2320-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2320 K shares the 100×215×73 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22320-EK",
      "SKF 22320 EK",
      "22320 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23022-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23022 CCK/W33",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 170,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 326,
    "static_load_kN": 440,
    "fatigue_load_limit_kN": 46.5,
    "max_rpm": 4300,
    "reference_speed_rpm": 3400,
    "limiting_speed_rpm": 4300,
    "weight_g": 5750,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For sleeve mounting on a 110 mm shaft, SKF order number SKF 23022 CCK/W33 is the 1:12 tapered-bore spherical roller bearing in the 23000-series family (dimension series 30 (slim OD, extra-wide)); the cylindrical-bore equivalent is a separate order number, 23022-cc-w33. Digit by digit, 23022-cck-w33 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 30, and bore reference 22 resolving to 110 mm; 170 mm OD and 45 mm width are the matching ISO 15 boundary values. Reading the suffix on 23022-cck-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 23022-cc-w33. At 3,400 r/min reference speed the 30.0 mm-section 23022-cck-w33 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 4,300 r/min as the mechanical ceiling. After drive-up, re-check radial clearance and then swing the outer ring through its self-aligning range: the sphered raceway of the 23022-cck-w33 must still tilt ≈ 0.5–2.5° freely — a joint that binds after sleeve mounting signals excessive drive-up or a cocked sleeve.",
    "applications": [
      "heavy conveyor head shafts in mining",
      "jaw and cone crusher main shafts",
      "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat",
      "split-housing plummer block arrangements with bearings swapped in situ"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Mount the 110 mm bore 23022-cck-w33 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 23000-series series at 110 mm bore (170×45 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The 23022-cck-w33 and its cylindrical-bore counterpart 23022-cc-w33 share envelope and load ratings (326/440 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23022-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "The 23022-cck-w33 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 326/440 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 326/440 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23022 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23022-cck-w33?",
        "a": "The SKF 23022 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 110 mm nominal bore, 170 mm outer diameter and 45 mm width (4.331 × 6.693 × 1.772 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 326 kN, C0 440 kN, Pu 46.5 kN, reference speed 3,400 r/min, limiting speed 4,300 r/min, mass about 5750 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23022-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23022-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 110 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23022-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23022-cck-w33 and 23022-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 326/440 kN ratings, but 23022-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23022-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23022",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23022; identical ISO 15 envelope, fits H322 adapter sleeve on a 100 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23022-CCK-W33",
      "SKF 23022 CCK/W33",
      "23022 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23122-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23122 CCK/W33",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 180,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 450,
    "static_load_kN": 585,
    "fatigue_load_limit_kN": 61,
    "max_rpm": 3600,
    "reference_speed_rpm": 2800,
    "limiting_speed_rpm": 3600,
    "weight_g": 7700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF 23122 CCK/W33 in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:12), intended for an H-series adapter sleeve or AH withdrawal sleeve, with two pressed-steel cages with a floating guide ring and the same 110×180×56 mm ISO 15 outline as its cylindrical-bore counterpart. Numbering ties the bearing to its envelope: 23122-cck-w33 means spherical-roller type, dimension series 31, 110 mm bore — which is why the 180×56 mm outline swaps dimensionally with other ISO 15 bearings of the same code. Reading the suffix on 23122-cck-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 23122-cc-w33. Catalogue mass 7700 g for the 110×180×56 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. For shafts with a locating shoulder, use an AH withdrawal sleeve instead of an adapter sleeve: the bearing presses against the shoulder and the sleeve is drawn out for dismounting, making the 23122-cck-w33 removable without an induction heater.",
    "applications": [
      "marine propulsion and thruster shafts",
      "cement-mill trunnion and drive shafts",
      "stepped shafts fitted with withdrawal sleeves against a fixed shoulder",
      "fan and pulley shafts that need periodic bearing removal in the field"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Mount the 110 mm bore 23122-cck-w33 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 23100-series series at 110 mm bore (180×56 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 56 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 110 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23122-cck-w33 with different sleeves.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 450/585 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23122 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23122-cck-w33?",
        "a": "The SKF 23122 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 110 mm nominal bore, 180 mm outer diameter and 56 mm width (4.331 × 7.087 × 2.205 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 450 kN, C0 585 kN, Pu 61 kN, reference speed 2,800 r/min, limiting speed 3,600 r/min, mass about 7700 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23122-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23122-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 110 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23122-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23122-cck-w33 and 23122-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 450/585 kN ratings, but 23122-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23122-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23122",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23122; identical ISO 15 envelope, fits H3122 adapter sleeve on a 100 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23122-CCK-W33",
      "SKF 23122 CCK/W33",
      "23122 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22222-EK",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22222 EK",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 200,
    "B_mm": 53,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 572,
    "static_load_kN": 640,
    "fatigue_load_limit_kN": 63,
    "max_rpm": 4000,
    "reference_speed_rpm": 3000,
    "limiting_speed_rpm": 4000,
    "weight_g": 8900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF lists SKF 22222 EK as the adapter-sleeve execution in the 22200-series range: a 110 mm nominal-bore spherical roller bearing whose 1:12 tapered inner ring is driven up a sleeve, with 200 mm OD and 53 mm width to the ISO 15 envelope. Reading the designation: the leading 2 marks a spherical roller bearing, the 22 is the ISO 15 dimension series (dimension series 22 (medium OD, wide)), and the last two digits encode the 110 mm bore; the 200 mm OD and 53 mm width follow the ISO 15 general plan. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. At 3,000 r/min reference speed the 45.0 mm-section 22222-ek is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 4,000 r/min as the mechanical ceiling. On an H adapter sleeve the 110 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 22222-ek inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.",
    "applications": [
      "heavy conveyor head shafts in mining",
      "jaw and cone crusher main shafts",
      "split-housing plummer block arrangements with bearings swapped in situ",
      "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still"
    ],
    "pitfalls": [
      "Mount the 110 mm bore 22222-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 22200-series series at 110 mm bore (200×53 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 22222-ek to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 53 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 572/640 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22222 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22222-ek?",
        "a": "The SKF 22222 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 110 mm nominal bore, 200 mm outer diameter and 53 mm width (4.331 × 7.874 × 2.087 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 572 kN, C0 640 kN, Pu 63 kN, reference speed 3,000 r/min, limiting speed 4,000 r/min, mass about 8900 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 22222-ek?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 22222-ek?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 110 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 22222-ek driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 22222-ek and 22222?",
        "a": "They share the ISO 15 envelope and the same 572/640 kN ratings, but 22222-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22222 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22222",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 22222; identical ISO 15 envelope, fits H322 adapter sleeve on a 100 mm shaft."
      },
      {
        "equiv_sku": "C2222",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2222 shares the 110×200×53 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C2222-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2222 K shares the 110×200×53 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22222-EK",
      "SKF 22222 EK",
      "22222 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23222-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23222 CCK/W33",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 200,
    "B_mm": 69.8,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 626,
    "static_load_kN": 765,
    "fatigue_load_limit_kN": 76.5,
    "max_rpm": 3200,
    "reference_speed_rpm": 2200,
    "limiting_speed_rpm": 3200,
    "weight_g": 12500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23222-cck-w33 is the 1:12 tapered-bore execution of the 23200-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 23222-cc-w33, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. On the SKF nameplate, 23222-cck-w33 follows the ISO 15 convention: 2 for the spherical roller type, 32 for the dimension series 32 (medium OD, extra wide), final digits 22 for the 110 mm bore. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. With C 626 kN and C0 765 kN, the 23222-cck-w33 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. Over-driving the 23222-cck-w33 up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.",
    "applications": [
      "large vibrating screens and feeders",
      "marine propulsion and thruster shafts",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal",
      "stepped shafts fitted with withdrawal sleeves against a fixed shoulder"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still"
    ],
    "pitfalls": [
      "Mount the 110 mm bore 23222-cck-w33 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 23200-series series at 110 mm bore (200×69.8 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 69.8 mm width changes abutment spacing, even though the 200 mm OD matches.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 110 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23222-cck-w33 with different sleeves.",
      "The 23222-cck-w33 and its cylindrical-bore counterpart 23222-cc-w33 share envelope and load ratings (626/765 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23222-cck-w33 pits long before its L10 life.",
      "The 626/765 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23222 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23222-cck-w33?",
        "a": "The SKF 23222 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 110 mm nominal bore, 200 mm outer diameter and 69.8 mm width (4.331 × 7.874 × 2.748 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 626 kN, C0 765 kN, Pu 76.5 kN, reference speed 2,200 r/min, limiting speed 3,200 r/min, mass about 12500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23222-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23222-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 110 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23222-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23222-cck-w33 and 23222-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 626/765 kN ratings, but 23222-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23222-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23222",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23222; identical ISO 15 envelope, fits H2322 adapter sleeve on a 100 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23222-CCK-W33",
      "SKF 23222 CCK/W33",
      "23222 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22322-EK",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22322 EK",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 240,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 989,
    "static_load_kN": 1120,
    "fatigue_load_limit_kN": 100,
    "max_rpm": 2800,
    "reference_speed_rpm": 2000,
    "limiting_speed_rpm": 2800,
    "weight_g": 21000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The SKF 22322 EK is a 110×240×80 mm spherical roller bearing with a 1:12 tapered bore — SKF catalogue execution for sleeve mounting on a 110 mm plain shaft, retaining the double-row self-aligning barrel-roller design. The code breaks down as type digit 2 (double-row spherical roller), dimension series 23 (dimension series 23 (heavy OD, wide)), and bore code 22 = 110 mm; dimensions 110×240×80 mm therefore match the ISO 15 envelope. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. Speed planning uses two different ceilings: 2,000 r/min thermal reference and 2,800 r/min mechanical limiting speed. At 110 mm bore, dismount after service is by KM locknut reversal or a hydraulic nut on larger sizes; oil-injection grooves on the bigger sleeves let pressurised oil float the 22322-ek off the taper without scoring either surface.",
    "applications": [
      "paper-machine press and dryer rolls",
      "rolling-mill pinion and back-up shafts",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal",
      "stepped shafts fitted with withdrawal sleeves against a fixed shoulder"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still"
    ],
    "pitfalls": [
      "Mount the 110 mm bore 22322-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.",
      "The 22300-series series at 110 mm bore (240×80 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 2,800 r/min ceiling.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 80 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 80 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "Catalogue reference speed and limiting speed are different limits: the 2,000 r/min reference is a thermal criterion under load, while the 2,800 r/min limiting value is the mechanical ceiling — observe both.",
      "The 989/1120 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22322 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22322-ek?",
        "a": "The SKF 22322 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 110 mm nominal bore, 240 mm outer diameter and 80 mm width (4.331 × 9.449 × 3.15 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 989 kN, C0 1120 kN, Pu 100 kN, reference speed 2,000 r/min, limiting speed 2,800 r/min, mass about 21000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 22322-ek?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 22322-ek?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 110 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 22322-ek driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 22322-ek and 22322?",
        "a": "They share the ISO 15 envelope and the same 989/1120 kN ratings, but 22322-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22322 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22322",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 22322; identical ISO 15 envelope, fits H2322 adapter sleeve on a 100 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22322-EK",
      "SKF 22322 EK",
      "22322 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23024-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23024 CCK/W33",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 180,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 366,
    "static_load_kN": 500,
    "fatigue_load_limit_kN": 52,
    "max_rpm": 4000,
    "reference_speed_rpm": 3200,
    "limiting_speed_rpm": 4000,
    "weight_g": 5950,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF 23024 CCK/W33 in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:12), intended for an H-series adapter sleeve or AH withdrawal sleeve, with two pressed-steel cages with a floating guide ring and the same 120×180×46 mm ISO 15 outline as its cylindrical-bore counterpart. On the SKF nameplate, 23024-cck-w33 follows the ISO 15 convention: 2 for the spherical roller type, 30 for the dimension series 30 (slim OD, extra-wide), final digits 24 for the 120 mm bore. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. The 30.0 mm radial section height ((180−120)/2) and 5950 g catalogue mass frame a 120 mm bore bearing rated at 366 kN C — roughly 3.05 kN of dynamic capacity per millimetre of bore before application factors. Over-driving the 23024-cck-w33 up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.",
    "applications": [
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "fan and pulley shafts that need periodic bearing removal in the field",
      "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still"
    ],
    "pitfalls": [
      "At 120 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23000-series series at 120 mm bore (180×46 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 120 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23024-cck-w33 with different sleeves.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 46 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "The 23024-cck-w33 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 366/500 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 366/500 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23024 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23024-cck-w33?",
        "a": "The SKF 23024 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 120 mm nominal bore, 180 mm outer diameter and 46 mm width (4.724 × 7.087 × 1.811 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 366 kN, C0 500 kN, Pu 52 kN, reference speed 3,200 r/min, limiting speed 4,000 r/min, mass about 5950 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23024-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23024-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 120 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23024-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23024-cck-w33 and 23024-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 366/500 kN ratings, but 23024-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23024-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23024",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23024; identical ISO 15 envelope, fits H3024 adapter sleeve on a 110 mm shaft."
      },
      {
        "equiv_sku": "C3024-V",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 3024 V shares the 120×180×46 mm envelope but catalogue C/C0 differ (430/640 kN vs 366/500 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23024-CCK-W33",
      "SKF 23024 CCK/W33",
      "23024 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23124-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23124 CCK/W33",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 200,
    "B_mm": 62,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 534,
    "static_load_kN": 695,
    "fatigue_load_limit_kN": 71,
    "max_rpm": 3400,
    "reference_speed_rpm": 2600,
    "limiting_speed_rpm": 3400,
    "weight_g": 10000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23124-cck-w33 is the 1:12 tapered-bore execution of the 23100-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 23124-cc-w33, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. The code breaks down as type digit 2 (double-row spherical roller), dimension series 31 (dimension series 31 (medium OD, wide)), and bore code 24 = 120 mm; dimensions 120×200×62 mm therefore match the ISO 15 envelope. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. Selection arithmetic: the C0/C ratio is about 1.30 (static 695 kN against dynamic 534 kN), typical of a spherical roller sized for heavy combined loads, and the 71 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Mounting on the 1:12 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 120 mm 23124-cck-w33, checked with feeler gauges before and after drive-up.",
    "applications": [
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal",
      "stepped shafts fitted with withdrawal sleeves against a fixed shoulder"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still"
    ],
    "pitfalls": [
      "At 120 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23100-series series at 120 mm bore (200×62 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23124-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "The 23124-cck-w33 and its cylindrical-bore counterpart 23124-cc-w33 share envelope and load ratings (534/695 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 534/695 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23124 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23124-cck-w33?",
        "a": "The SKF 23124 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 120 mm nominal bore, 200 mm outer diameter and 62 mm width (4.724 × 7.874 × 2.441 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 534 kN, C0 695 kN, Pu 71 kN, reference speed 2,600 r/min, limiting speed 3,400 r/min, mass about 10000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23124-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23124-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 120 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23124-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23124-cck-w33 and 23124-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 534/695 kN ratings, but 23124-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23124-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23124",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23124; identical ISO 15 envelope, fits H3124 adapter sleeve on a 110 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23124-CCK-W33",
      "SKF 23124 CCK/W33",
      "23124 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22224-EK",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22224 EK",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 215,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 652,
    "static_load_kN": 765,
    "fatigue_load_limit_kN": 73.5,
    "max_rpm": 3800,
    "reference_speed_rpm": 2800,
    "limiting_speed_rpm": 3800,
    "weight_g": 11000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF 22224 EK in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:12), intended for an H-series adapter sleeve or AH withdrawal sleeve, with two pressed-steel cages with a floating guide ring and the same 120×215×58 mm ISO 15 outline as its cylindrical-bore counterpart. Digit by digit, 22224-ek reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 22, and bore reference 24 resolving to 120 mm; 215 mm OD and 58 mm width are the matching ISO 15 boundary values. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. Catalogue mass 11000 g for the 120×215×58 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. Because driving up the 1:12 taper consumes radial clearance, K executions are commonly ordered with C3 initial clearance so the residual running clearance after mounting matches the cylindrical-bore 22224 on an interference seat.",
    "applications": [
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "split-housing plummer block arrangements with bearings swapped in situ",
      "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 120 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 22200-series series at 120 mm bore (215×58 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 58 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 58 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 22224-ek pits long before its L10 life.",
      "The 652/765 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22224 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22224-ek?",
        "a": "The SKF 22224 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 120 mm nominal bore, 215 mm outer diameter and 58 mm width (4.724 × 8.465 × 2.283 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 652 kN, C0 765 kN, Pu 73.5 kN, reference speed 2,800 r/min, limiting speed 3,800 r/min, mass about 11000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 22224-ek?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 22224-ek?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 120 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 22224-ek driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 22224-ek and 22224?",
        "a": "They share the ISO 15 envelope and the same 652/765 kN ratings, but 22224-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22224 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22224",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 22224; identical ISO 15 envelope, fits H3124 adapter sleeve on a 110 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22224-EK",
      "SKF 22224 EK",
      "22224 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23224-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23224 CCK/W33",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 215,
    "B_mm": 76,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 732,
    "static_load_kN": 930,
    "fatigue_load_limit_kN": 93,
    "max_rpm": 2800,
    "reference_speed_rpm": 2000,
    "limiting_speed_rpm": 2800,
    "weight_g": 14500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23224-cck-w33 is the 1:12 tapered-bore execution of the 23200-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 23224-cc-w33, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. Reading the designation: the leading 2 marks a spherical roller bearing, the 32 is the ISO 15 dimension series (dimension series 32 (medium OD, extra wide)), and the last two digits encode the 120 mm bore; the 215 mm OD and 76 mm width follow the ISO 15 general plan. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. At 2,000 r/min reference speed the 47.5 mm-section 23224-cck-w33 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 2,800 r/min as the mechanical ceiling. For shafts with a locating shoulder, use an AH withdrawal sleeve instead of an adapter sleeve: the bearing presses against the shoulder and the sleeve is drawn out for dismounting, making the 23224-cck-w33 removable without an induction heater.",
    "applications": [
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts",
      "split-housing plummer block arrangements with bearings swapped in situ",
      "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 120 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23200-series series at 120 mm bore (215×76 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 76 mm width changes abutment spacing, even though the 215 mm OD matches.",
      "The 23224-cck-w33 and its cylindrical-bore counterpart 23224-cc-w33 share envelope and load ratings (732/930 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 120 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23224-cck-w33 with different sleeves.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23224-cck-w33 pits long before its L10 life.",
      "The 732/930 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23224 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23224-cck-w33?",
        "a": "The SKF 23224 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 120 mm nominal bore, 215 mm outer diameter and 76 mm width (4.724 × 8.465 × 2.992 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 732 kN, C0 930 kN, Pu 93 kN, reference speed 2,000 r/min, limiting speed 2,800 r/min, mass about 14500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23224-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23224-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 120 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23224-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23224-cck-w33 and 23224-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 732/930 kN ratings, but 23224-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23224-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23224",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23224; identical ISO 15 envelope, fits H2324 adapter sleeve on a 110 mm shaft."
      },
      {
        "equiv_sku": "C3224",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3224 shares the 120×215×76 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C3224-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3224 K shares the 120×215×76 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23224-CCK-W33",
      "SKF 23224 CCK/W33",
      "23224 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22324-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22324 CCK/W33",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 260,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1019,
    "static_load_kN": 1120,
    "fatigue_load_limit_kN": 100,
    "max_rpm": 2600,
    "reference_speed_rpm": 2000,
    "limiting_speed_rpm": 2600,
    "weight_g": 25500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The SKF 22324 CCK/W33 is a 120×260×86 mm spherical roller bearing with a 1:12 tapered bore — SKF catalogue execution for sleeve mounting on a 120 mm plain shaft, retaining the double-row self-aligning barrel-roller design. The code breaks down as type digit 2 (double-row spherical roller), dimension series 23 (dimension series 23 (heavy OD, wide)), and bore code 24 = 120 mm; dimensions 120×260×86 mm therefore match the ISO 15 envelope. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. Catalogue mass 25500 g for the 120×260×86 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. For shafts with a locating shoulder, use an AH withdrawal sleeve instead of an adapter sleeve: the bearing presses against the shoulder and the sleeve is drawn out for dismounting, making the 22324-cck-w33 removable without an induction heater.",
    "applications": [
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "fan and pulley shafts that need periodic bearing removal in the field",
      "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At 120 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 22300-series series at 120 mm bore (260×86 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 2,600 r/min ceiling.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 22324-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 86 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 22324-cck-w33 pits long before its L10 life.",
      "The 1019/1120 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22324 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22324-cck-w33?",
        "a": "The SKF 22324 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 120 mm nominal bore, 260 mm outer diameter and 86 mm width (4.724 × 10.236 × 3.386 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1019 kN, C0 1120 kN, Pu 100 kN, reference speed 2,000 r/min, limiting speed 2,600 r/min, mass about 25500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 22324-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 22324-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 120 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 22324-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 22324-cck-w33 and 22324-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 1019/1120 kN ratings, but 22324-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22324-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22324",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 22324; identical ISO 15 envelope, fits H2324 adapter sleeve on a 110 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22324-CCK-W33",
      "SKF 22324 CCK/W33",
      "22324 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23026-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23026 CCK/W33",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 200,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 452,
    "static_load_kN": 610,
    "fatigue_load_limit_kN": 61,
    "max_rpm": 3600,
    "reference_speed_rpm": 2800,
    "limiting_speed_rpm": 3600,
    "weight_g": 8600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF 23026 CCK/W33 in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:12), intended for an H-series adapter sleeve or AH withdrawal sleeve, with two pressed-steel cages with a floating guide ring and the same 130×200×52 mm ISO 15 outline as its cylindrical-bore counterpart. Reading the designation: the leading 2 marks a spherical roller bearing, the 30 is the ISO 15 dimension series (dimension series 30 (slim OD, extra-wide)), and the last two digits encode the 130 mm bore; the 200 mm OD and 52 mm width follow the ISO 15 general plan. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. The 61 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.35 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. For shafts with a locating shoulder, use an AH withdrawal sleeve instead of an adapter sleeve: the bearing presses against the shoulder and the sleeve is drawn out for dismounting, making the 23026-cck-w33 removable without an induction heater.",
    "applications": [
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal",
      "stepped shafts fitted with withdrawal sleeves against a fixed shoulder"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 130 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23000-series series at 130 mm bore (200×52 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The 23026-cck-w33 and its cylindrical-bore counterpart 23026-cc-w33 share envelope and load ratings (452/610 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23026-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "The 23026-cck-w33 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 452/610 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 452/610 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23026 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23026-cck-w33?",
        "a": "The SKF 23026 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 130 mm nominal bore, 200 mm outer diameter and 52 mm width (5.118 × 7.874 × 2.047 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 452 kN, C0 610 kN, Pu 61 kN, reference speed 2,800 r/min, limiting speed 3,600 r/min, mass about 8600 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23026-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23026-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 130 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23026-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23026-cck-w33 and 23026-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 452/610 kN ratings, but 23026-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23026-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23026",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23026; identical ISO 15 envelope, fits H3026 adapter sleeve on a 110 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23026-CCK-W33",
      "SKF 23026 CCK/W33",
      "23026 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23126-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23126 CCK/W33",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 210,
    "B_mm": 64,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 586,
    "static_load_kN": 780,
    "fatigue_load_limit_kN": 78,
    "max_rpm": 3200,
    "reference_speed_rpm": 2400,
    "limiting_speed_rpm": 3200,
    "weight_g": 12000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23126-cck-w33 is the 1:12 tapered-bore execution of the 23100-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 23126-cc-w33, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. Digit by digit, 23126-cck-w33 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 31, and bore reference 26 resolving to 130 mm; 210 mm OD and 64 mm width are the matching ISO 15 boundary values. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. With C 586 kN and C0 780 kN, the 23126-cck-w33 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. On an H adapter sleeve the 130 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 23126-cck-w33 inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.",
    "applications": [
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "split-housing plummer block arrangements with bearings swapped in situ",
      "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 130 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23100-series series at 130 mm bore (210×64 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 64 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 130 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23126-cck-w33 with different sleeves.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 586/780 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23126 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23126-cck-w33?",
        "a": "The SKF 23126 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 130 mm nominal bore, 210 mm outer diameter and 64 mm width (5.118 × 8.268 × 2.52 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 586 kN, C0 780 kN, Pu 78 kN, reference speed 2,400 r/min, limiting speed 3,200 r/min, mass about 12000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23126-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23126-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 130 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23126-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23126-cck-w33 and 23126-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 586/780 kN ratings, but 23126-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23126-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23126",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23126; identical ISO 15 envelope, fits H3126 adapter sleeve on a 110 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23126-CCK-W33",
      "SKF 23126 CCK/W33",
      "23126 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22226-EK",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22226 EK",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 230,
    "B_mm": 64,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 758,
    "static_load_kN": 930,
    "fatigue_load_limit_kN": 88,
    "max_rpm": 3600,
    "reference_speed_rpm": 2600,
    "limiting_speed_rpm": 3600,
    "weight_g": 14000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The SKF 22226 EK is a 130×230×64 mm spherical roller bearing with a 1:12 tapered bore — SKF catalogue execution for sleeve mounting on a 130 mm plain shaft, retaining the double-row self-aligning barrel-roller design. Numbering ties the bearing to its envelope: 22226-ek means spherical-roller type, dimension series 22, 130 mm bore — which is why the 230×64 mm outline swaps dimensionally with other ISO 15 bearings of the same code. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. With C 758 kN and C0 930 kN, the 22226-ek load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. After drive-up, re-check radial clearance and then swing the outer ring through its self-aligning range: the sphered raceway of the 22226-ek must still tilt ≈ 0.5–2.5° freely — a joint that binds after sleeve mounting signals excessive drive-up or a cocked sleeve.",
    "applications": [
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "At 130 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 22200-series series at 130 mm bore (230×64 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 22226-ek to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "The 22226-ek and its cylindrical-bore counterpart 22226 share envelope and load ratings (758/930 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 22226-ek pits long before its L10 life.",
      "The 758/930 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22226 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22226-ek?",
        "a": "The SKF 22226 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 130 mm nominal bore, 230 mm outer diameter and 64 mm width (5.118 × 9.055 × 2.52 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 758 kN, C0 930 kN, Pu 88 kN, reference speed 2,600 r/min, limiting speed 3,600 r/min, mass about 14000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 22226-ek?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 22226-ek?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 130 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 22226-ek driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 22226-ek and 22226?",
        "a": "They share the ISO 15 envelope and the same 758/930 kN ratings, but 22226-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22226 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22226",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 22226; identical ISO 15 envelope, fits H3126 adapter sleeve on a 110 mm shaft."
      },
      {
        "equiv_sku": "C2226",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2226 shares the 130×230×64 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C2226-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 2226 K shares the 130×230×64 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22226-EK",
      "SKF 22226 EK",
      "22226 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23226-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23226 CCK/W33",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 230,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 826,
    "static_load_kN": 1060,
    "fatigue_load_limit_kN": 104,
    "max_rpm": 2600,
    "reference_speed_rpm": 1900,
    "limiting_speed_rpm": 2600,
    "weight_g": 18500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The SKF 23226 CCK/W33 is a 130×230×80 mm spherical roller bearing with a 1:12 tapered bore — SKF catalogue execution for sleeve mounting on a 130 mm plain shaft, retaining the double-row self-aligning barrel-roller design. Numbering ties the bearing to its envelope: 23226-cck-w33 means spherical-roller type, dimension series 32, 130 mm bore — which is why the 230×80 mm outline swaps dimensionally with other ISO 15 bearings of the same code. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. The 50.0 mm radial section height ((230−130)/2) and 18500 g catalogue mass frame a 130 mm bore bearing rated at 826 kN C — roughly 6.35 kN of dynamic capacity per millimetre of bore before application factors. Mounting on the 1:12 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 130 mm 23226-cck-w33, checked with feeler gauges before and after drive-up.",
    "applications": [
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat",
      "split-housing plummer block arrangements with bearings swapped in situ"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals"
    ],
    "pitfalls": [
      "At 130 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23200-series series at 130 mm bore (230×80 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 80 mm width changes abutment spacing, even though the 230 mm OD matches.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 130 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23226-cck-w33 with different sleeves.",
      "The 23226-cck-w33 and its cylindrical-bore counterpart 23226-cc-w33 share envelope and load ratings (826/1060 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23226-cck-w33 pits long before its L10 life.",
      "The 826/1060 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23226 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23226-cck-w33?",
        "a": "The SKF 23226 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 130 mm nominal bore, 230 mm outer diameter and 80 mm width (5.118 × 9.055 × 3.15 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 826 kN, C0 1060 kN, Pu 104 kN, reference speed 1,900 r/min, limiting speed 2,600 r/min, mass about 18500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23226-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23226-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 130 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23226-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23226-cck-w33 and 23226-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 826/1060 kN ratings, but 23226-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23226-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23226",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23226; identical ISO 15 envelope, fits H2326 adapter sleeve on a 110 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23226-CCK-W33",
      "SKF 23226 CCK/W33",
      "23226 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22326-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22326 CCK/W33",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 280,
    "B_mm": 93,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1176,
    "static_load_kN": 1320,
    "fatigue_load_limit_kN": 114,
    "max_rpm": 2400,
    "reference_speed_rpm": 1800,
    "limiting_speed_rpm": 2400,
    "weight_g": 33000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 22326-cck-w33 denotes the tapered-bore version (K suffix, taper 1:12) of the 22300-series spherical roller bearing: dimensioned 130×280×93 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. Digit by digit, 22326-cck-w33 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 23, and bore reference 26 resolving to 130 mm; 280 mm OD and 93 mm width are the matching ISO 15 boundary values. Reading the suffix on 22326-cck-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 22326-cc-w33. Selection arithmetic: the C0/C ratio is about 1.12 (static 1320 kN against dynamic 1176 kN), typical of a spherical roller sized for heavy combined loads, and the 114 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Mounting on the 1:12 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 130 mm 22326-cck-w33, checked with feeler gauges before and after drive-up.",
    "applications": [
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "stepped shafts fitted with withdrawal sleeves against a fixed shoulder",
      "fan and pulley shafts that need periodic bearing removal in the field"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "At 130 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 22300-series series at 130 mm bore (280×93 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 2,400 r/min ceiling.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 93 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 22326-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 22326-cck-w33 pits long before its L10 life.",
      "The 1176/1320 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22326 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22326-cck-w33?",
        "a": "The SKF 22326 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 130 mm nominal bore, 280 mm outer diameter and 93 mm width (5.118 × 11.024 × 3.661 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1176 kN, C0 1320 kN, Pu 114 kN, reference speed 1,800 r/min, limiting speed 2,400 r/min, mass about 33000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 22326-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 22326-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 130 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 22326-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 22326-cck-w33 and 22326-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 1176/1320 kN ratings, but 22326-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22326-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22326",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 22326; identical ISO 15 envelope, fits H2326 adapter sleeve on a 110 mm shaft."
      },
      {
        "equiv_sku": "C2326-K-VE240",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2326 K/VE240 shares the 130×280×93 mm envelope but catalogue C/C0 differ (980/1220 kN vs 1176/1320 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22326-CCK-W33",
      "SKF 22326 CCK/W33",
      "22326 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23028-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23028 CCK/W33",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 210,
    "B_mm": 53,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 485,
    "static_load_kN": 680,
    "fatigue_load_limit_kN": 68,
    "max_rpm": 3400,
    "reference_speed_rpm": 2600,
    "limiting_speed_rpm": 3400,
    "weight_g": 9400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23028-cck-w33 is the 1:12 tapered-bore execution of the 23000-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 23028-cc-w33, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. Numbering ties the bearing to its envelope: 23028-cck-w33 means spherical-roller type, dimension series 30, 140 mm bore — which is why the 210×53 mm outline swaps dimensionally with other ISO 15 bearings of the same code. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. Speed planning uses two different ceilings: 2,600 r/min thermal reference and 3,400 r/min mechanical limiting speed. Mounting on the 1:12 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 140 mm 23028-cck-w33, checked with feeler gauges before and after drive-up.",
    "applications": [
      "large mining crusher main shafts",
      "wind-turbine main shaft support",
      "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals"
    ],
    "pitfalls": [
      "At 140 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23000-series series at 140 mm bore (210×53 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 140 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23028-cck-w33 with different sleeves.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 53 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "The 23028-cck-w33 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 485/680 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 485/680 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23028 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23028-cck-w33?",
        "a": "The SKF 23028 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 140 mm nominal bore, 210 mm outer diameter and 53 mm width (5.512 × 8.268 × 2.087 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 485 kN, C0 680 kN, Pu 68 kN, reference speed 2,600 r/min, limiting speed 3,400 r/min, mass about 9400 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23028-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23028-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 140 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23028-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23028-cck-w33 and 23028-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 485/680 kN ratings, but 23028-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23028-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23028",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23028; identical ISO 15 envelope, fits H3028 adapter sleeve on a 110 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23028-CCK-W33",
      "SKF 23028 CCK/W33",
      "23028 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23128-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23128 CCK/W33",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 225,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 659,
    "static_load_kN": 900,
    "fatigue_load_limit_kN": 88,
    "max_rpm": 2800,
    "reference_speed_rpm": 2200,
    "limiting_speed_rpm": 2800,
    "weight_g": 14500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The SKF 23128 CCK/W33 is a 140×225×68 mm spherical roller bearing with a 1:12 tapered bore — SKF catalogue execution for sleeve mounting on a 140 mm plain shaft, retaining the double-row self-aligning barrel-roller design. On the SKF nameplate, 23128-cck-w33 follows the ISO 15 convention: 2 for the spherical roller type, 31 for the dimension series 31 (medium OD, wide), final digits 28 for the 140 mm bore. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. At 2,200 r/min reference speed the 42.5 mm-section 23128-cck-w33 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 2,800 r/min as the mechanical ceiling. After drive-up, re-check radial clearance and then swing the outer ring through its self-aligning range: the sphered raceway of the 23128-cck-w33 must still tilt ≈ 0.5–2.5° freely — a joint that binds after sleeve mounting signals excessive drive-up or a cocked sleeve.",
    "applications": [
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts",
      "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat",
      "split-housing plummer block arrangements with bearings swapped in situ"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals"
    ],
    "pitfalls": [
      "At 140 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23100-series series at 140 mm bore (225×68 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23128-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "The 23128-cck-w33 and its cylindrical-bore counterpart 23128-cc-w33 share envelope and load ratings (659/900 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 659/900 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23128 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23128-cck-w33?",
        "a": "The SKF 23128 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 140 mm nominal bore, 225 mm outer diameter and 68 mm width (5.512 × 8.858 × 2.677 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 659 kN, C0 900 kN, Pu 88 kN, reference speed 2,200 r/min, limiting speed 2,800 r/min, mass about 14500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23128-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23128-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 140 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23128-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23128-cck-w33 and 23128-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 659/900 kN ratings, but 23128-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23128-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23128",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23128; identical ISO 15 envelope, fits H3128 adapter sleeve on a 110 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23128-CCK-W33",
      "SKF 23128 CCK/W33",
      "23128 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22228-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22228 CCK/W33",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 250,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 743,
    "static_load_kN": 900,
    "fatigue_load_limit_kN": 86.5,
    "max_rpm": 3200,
    "reference_speed_rpm": 2400,
    "limiting_speed_rpm": 3200,
    "weight_g": 18000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The SKF 22228 CCK/W33 is a 140×250×68 mm spherical roller bearing with a 1:12 tapered bore — SKF catalogue execution for sleeve mounting on a 140 mm plain shaft, retaining the double-row self-aligning barrel-roller design. Numbering ties the bearing to its envelope: 22228-cck-w33 means spherical-roller type, dimension series 22, 140 mm bore — which is why the 250×68 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. Catalogue mass 18000 g for the 140×250×68 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. Over-driving the 22228-cck-w33 up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.",
    "applications": [
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal",
      "stepped shafts fitted with withdrawal sleeves against a fixed shoulder"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems"
    ],
    "pitfalls": [
      "At 140 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 22200-series series at 140 mm bore (250×68 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 140 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 22228-cck-w33 with different sleeves.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 22228-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 743/900 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22228 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22228-cck-w33?",
        "a": "The SKF 22228 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 140 mm nominal bore, 250 mm outer diameter and 68 mm width (5.512 × 9.843 × 2.677 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 743 kN, C0 900 kN, Pu 86.5 kN, reference speed 2,400 r/min, limiting speed 3,200 r/min, mass about 18000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 22228-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 22228-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 140 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 22228-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 22228-cck-w33 and 22228-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 743/900 kN ratings, but 22228-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22228-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22228",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 22228; identical ISO 15 envelope, fits H3128 adapter sleeve on a 110 mm shaft."
      },
      {
        "equiv_sku": "C2228",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2228 shares the 140×250×68 mm envelope but catalogue C/C0 differ (830/1060 kN vs 743/900 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C2228-K",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2228 K shares the 140×250×68 mm envelope but catalogue C/C0 differ (830/1060 kN vs 743/900 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22228-CCK-W33",
      "SKF 22228 CCK/W33",
      "22228 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23228-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23228 CCK/W33",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 250,
    "B_mm": 88,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 962,
    "static_load_kN": 1250,
    "fatigue_load_limit_kN": 120,
    "max_rpm": 2400,
    "reference_speed_rpm": 1700,
    "limiting_speed_rpm": 2400,
    "weight_g": 24000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The SKF 23228 CCK/W33 is a 140×250×88 mm spherical roller bearing with a 1:12 tapered bore — SKF catalogue execution for sleeve mounting on a 140 mm plain shaft, retaining the double-row self-aligning barrel-roller design. The code breaks down as type digit 2 (double-row spherical roller), dimension series 32 (dimension series 32 (medium OD, extra wide)), and bore code 28 = 140 mm; dimensions 140×250×88 mm therefore match the ISO 15 envelope. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. The 120 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.30 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. On an H adapter sleeve the 140 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 23228-cck-w33 inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.",
    "applications": [
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "stepped shafts fitted with withdrawal sleeves against a fixed shoulder",
      "fan and pulley shafts that need periodic bearing removal in the field"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "At 140 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23200-series series at 140 mm bore (250×88 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 88 mm width changes abutment spacing, even though the 250 mm OD matches.",
      "The 23228-cck-w33 and its cylindrical-bore counterpart 23228-cc-w33 share envelope and load ratings (962/1250 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 140 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23228-cck-w33 with different sleeves.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23228-cck-w33 pits long before its L10 life.",
      "The 962/1250 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23228 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23228-cck-w33?",
        "a": "The SKF 23228 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 140 mm nominal bore, 250 mm outer diameter and 88 mm width (5.512 × 9.843 × 3.465 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 962 kN, C0 1250 kN, Pu 120 kN, reference speed 1,700 r/min, limiting speed 2,400 r/min, mass about 24000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23228-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23228-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 140 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23228-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23228-cck-w33 and 23228-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 962/1250 kN ratings, but 23228-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23228-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23228",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23228; identical ISO 15 envelope, fits H2328 adapter sleeve on a 110 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23228-CCK-W33",
      "SKF 23228 CCK/W33",
      "23228 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22328-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22328 CCK/W33",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 300,
    "B_mm": 102,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1357,
    "static_load_kN": 1560,
    "fatigue_load_limit_kN": 132,
    "max_rpm": 2200,
    "reference_speed_rpm": 1700,
    "limiting_speed_rpm": 2200,
    "weight_g": 41000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 22328-cck-w33 denotes the tapered-bore version (K suffix, taper 1:12) of the 22300-series spherical roller bearing: dimensioned 140×300×102 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. On the SKF nameplate, 22328-cck-w33 follows the ISO 15 convention: 2 for the spherical roller type, 23 for the dimension series 23 (heavy OD, wide), final digits 28 for the 140 mm bore. Reading the suffix on 22328-cck-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 22328-cc-w33. With C 1357 kN and C0 1560 kN, the 22328-cck-w33 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. On an H adapter sleeve the 140 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 22328-cck-w33 inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.",
    "applications": [
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "smearing on the roller-raceway contact during skid starts below the minimum load"
    ],
    "pitfalls": [
      "At 140 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 22300-series series at 140 mm bore (300×102 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 2,200 r/min ceiling.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 22328-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 102 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 22328-cck-w33 pits long before its L10 life.",
      "The 1357/1560 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22328 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22328-cck-w33?",
        "a": "The SKF 22328 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 140 mm nominal bore, 300 mm outer diameter and 102 mm width (5.512 × 11.811 × 4.016 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1357 kN, C0 1560 kN, Pu 132 kN, reference speed 1,700 r/min, limiting speed 2,200 r/min, mass about 41000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 22328-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 22328-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 140 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 22328-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 22328-cck-w33 and 22328-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 1357/1560 kN ratings, but 22328-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22328-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22328",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 22328; identical ISO 15 envelope, fits H2328 adapter sleeve on a 110 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22328-CCK-W33",
      "SKF 22328 CCK/W33",
      "22328 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23030-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23030 CCK/W33",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 225,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 531,
    "static_load_kN": 750,
    "fatigue_load_limit_kN": 73.5,
    "max_rpm": 3200,
    "reference_speed_rpm": 2400,
    "limiting_speed_rpm": 3200,
    "weight_g": 11000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 23030-cck-w33 denotes the tapered-bore version (K suffix, taper 1:12) of the 23000-series spherical roller bearing: dimensioned 150×225×56 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. On the SKF nameplate, 23030-cck-w33 follows the ISO 15 convention: 2 for the spherical roller type, 30 for the dimension series 30 (slim OD, extra-wide), final digits 30 for the 150 mm bore. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. Selection arithmetic: the C0/C ratio is about 1.41 (static 750 kN against dynamic 531 kN), typical of a spherical roller sized for heavy combined loads, and the 73.5 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Over-driving the 23030-cck-w33 up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.",
    "applications": [
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "fan and pulley shafts that need periodic bearing removal in the field",
      "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 150 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23000-series series at 150 mm bore (225×56 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 150 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23030-cck-w33 with different sleeves.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 150 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23030-cck-w33 with different sleeves.",
      "The 23030-cck-w33 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 531/750 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 531/750 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23030 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23030-cck-w33?",
        "a": "The SKF 23030 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 150 mm nominal bore, 225 mm outer diameter and 56 mm width (5.906 × 8.858 × 2.205 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 531 kN, C0 750 kN, Pu 73.5 kN, reference speed 2,400 r/min, limiting speed 3,200 r/min, mass about 11000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23030-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23030-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 150 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23030-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23030-cck-w33 and 23030-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 531/750 kN ratings, but 23030-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23030-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23030",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23030; identical ISO 15 envelope, fits H3030 adapter sleeve on a 110 mm shaft."
      },
      {
        "equiv_sku": "C3030-MB",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 3030 MB shares the 150×225×56 mm envelope but catalogue C/C0 differ (540/850 kN vs 531/750 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C3030-V",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 3030 V shares the 150×225×56 mm envelope but catalogue C/C0 differ (585/960 kN vs 531/750 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C3030-KV",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 3030 KV shares the 150×225×56 mm envelope but catalogue C/C0 differ (585/960 kN vs 531/750 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23030-CCK-W33",
      "SKF 23030 CCK/W33",
      "23030 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23130-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23130 CCK/W33",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 250,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 883,
    "static_load_kN": 1200,
    "fatigue_load_limit_kN": 114,
    "max_rpm": 2600,
    "reference_speed_rpm": 2000,
    "limiting_speed_rpm": 2600,
    "weight_g": 21000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF lists SKF 23130 CCK/W33 as the adapter-sleeve execution in the 23100-series range: a 150 mm nominal-bore spherical roller bearing whose 1:12 tapered inner ring is driven up a sleeve, with 250 mm OD and 80 mm width to the ISO 15 envelope. The code breaks down as type digit 2 (double-row spherical roller), dimension series 31 (dimension series 31 (medium OD, wide)), and bore code 30 = 150 mm; dimensions 150×250×80 mm therefore match the ISO 15 envelope. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. At 2,000 r/min reference speed the 50.0 mm-section 23130-cck-w33 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 2,600 r/min as the mechanical ceiling. On an H adapter sleeve the 150 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 23130-cck-w33 inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.",
    "applications": [
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts",
      "stepped shafts fitted with withdrawal sleeves against a fixed shoulder",
      "fan and pulley shafts that need periodic bearing removal in the field"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals"
    ],
    "pitfalls": [
      "At 150 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23100-series series at 150 mm bore (250×80 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23130-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "The 23130-cck-w33 and its cylindrical-bore counterpart 23130-cc-w33 share envelope and load ratings (883/1200 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "The 21000 g mass and 80 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23130-cck-w33.",
      "The 883/1200 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23130 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23130-cck-w33?",
        "a": "The SKF 23130 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 150 mm nominal bore, 250 mm outer diameter and 80 mm width (5.906 × 9.843 × 3.15 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 883 kN, C0 1200 kN, Pu 114 kN, reference speed 2,000 r/min, limiting speed 2,600 r/min, mass about 21000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23130-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23130-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 150 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23130-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23130-cck-w33 and 23130-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 883/1200 kN ratings, but 23130-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23130-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23130",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23130; identical ISO 15 envelope, fits H3130 adapter sleeve on a 110 mm shaft."
      },
      {
        "equiv_sku": "C3130",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3130 shares the 150×250×80 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C3130-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3130 K shares the 150×250×80 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23130-CCK-W33",
      "SKF 23130 CCK/W33",
      "23130 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22230-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22230 CCK/W33",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 270,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 898,
    "static_load_kN": 1080,
    "fatigue_load_limit_kN": 102,
    "max_rpm": 3000,
    "reference_speed_rpm": 2200,
    "limiting_speed_rpm": 3000,
    "weight_g": 23000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For sleeve mounting on a 150 mm shaft, SKF order number SKF 22230 CCK/W33 is the 1:12 tapered-bore spherical roller bearing in the 22200-series family (dimension series 22 (medium OD, wide)); the cylindrical-bore equivalent is a separate order number, 22230-cc-w33. On the SKF nameplate, 22230-cck-w33 follows the ISO 15 convention: 2 for the spherical roller type, 22 for the dimension series 22 (medium OD, wide), final digits 30 for the 150 mm bore. Reading the suffix on 22230-cck-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 22230-cc-w33. Catalogue mass 23000 g for the 150×270×73 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. On an H adapter sleeve the 150 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 22230-cck-w33 inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.",
    "applications": [
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "At 150 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 22200-series series at 150 mm bore (270×73 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 150 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 22230-cck-w33 with different sleeves.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 22230-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "The 23000 g mass and 73 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 22230-cck-w33.",
      "The 898/1080 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22230 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22230-cck-w33?",
        "a": "The SKF 22230 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 150 mm nominal bore, 270 mm outer diameter and 73 mm width (5.906 × 10.63 × 2.874 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 898 kN, C0 1080 kN, Pu 102 kN, reference speed 2,200 r/min, limiting speed 3,000 r/min, mass about 23000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 22230-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 22230-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 150 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 22230-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 22230-cck-w33 and 22230-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 898/1080 kN ratings, but 22230-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22230-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22230",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 22230; identical ISO 15 envelope, fits H3130 adapter sleeve on a 110 mm shaft."
      },
      {
        "equiv_sku": "C2230",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2230 shares the 150×270×73 mm envelope but catalogue C/C0 differ (980/1220 kN vs 898/1080 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C2230-K",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 2230 K shares the 150×270×73 mm envelope but catalogue C/C0 differ (980/1220 kN vs 898/1080 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22230-CCK-W33",
      "SKF 22230 CCK/W33",
      "22230 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23230-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23230 CCK/W33",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 270,
    "B_mm": 96,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1129,
    "static_load_kN": 1460,
    "fatigue_load_limit_kN": 137,
    "max_rpm": 2200,
    "reference_speed_rpm": 1600,
    "limiting_speed_rpm": 2200,
    "weight_g": 30000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For sleeve mounting on a 150 mm shaft, SKF order number SKF 23230 CCK/W33 is the 1:12 tapered-bore spherical roller bearing in the 23200-series family (dimension series 32 (medium OD, extra wide)); the cylindrical-bore equivalent is a separate order number, 23230-cc-w33. Reading the designation: the leading 2 marks a spherical roller bearing, the 32 is the ISO 15 dimension series (dimension series 32 (medium OD, extra wide)), and the last two digits encode the 150 mm bore; the 270 mm OD and 96 mm width follow the ISO 15 general plan. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. Catalogue mass 30000 g for the 150×270×96 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. Because driving up the 1:12 taper consumes radial clearance, K executions are commonly ordered with C3 initial clearance so the residual running clearance after mounting matches the cylindrical-bore 23230-cc-w33 on an interference seat.",
    "applications": [
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals"
    ],
    "pitfalls": [
      "At 150 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23200-series series at 150 mm bore (270×96 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 96 mm width changes abutment spacing, even though the 270 mm OD matches.",
      "The 23230-cck-w33 and its cylindrical-bore counterpart 23230-cc-w33 share envelope and load ratings (1129/1460 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23230-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23230-cck-w33 pits long before its L10 life.",
      "The 1129/1460 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23230 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23230-cck-w33?",
        "a": "The SKF 23230 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 150 mm nominal bore, 270 mm outer diameter and 96 mm width (5.906 × 10.63 × 3.78 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1129 kN, C0 1460 kN, Pu 137 kN, reference speed 1,600 r/min, limiting speed 2,200 r/min, mass about 30000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23230-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23230-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 150 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23230-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23230-cck-w33 and 23230-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 1129/1460 kN ratings, but 23230-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23230-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23230",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23230; identical ISO 15 envelope, fits H2330 adapter sleeve on a 110 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23230-CCK-W33",
      "SKF 23230 CCK/W33",
      "23230 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22330-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22330 CCK/W33",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 320,
    "B_mm": 108,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1539,
    "static_load_kN": 1760,
    "fatigue_load_limit_kN": 146,
    "max_rpm": 2000,
    "reference_speed_rpm": 1600,
    "limiting_speed_rpm": 2000,
    "weight_g": 47500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF 22330 CCK/W33 in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:12), intended for an H-series adapter sleeve or AH withdrawal sleeve, with two pressed-steel cages with a floating guide ring and the same 150×320×108 mm ISO 15 outline as its cylindrical-bore counterpart. Numbering ties the bearing to its envelope: 22330-cck-w33 means spherical-roller type, dimension series 23, 150 mm bore — which is why the 320×108 mm outline swaps dimensionally with other ISO 15 bearings of the same code. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. The 85.0 mm radial section height ((320−150)/2) and 47500 g catalogue mass frame a 150 mm bore bearing rated at 1539 kN C — roughly 10.26 kN of dynamic capacity per millimetre of bore before application factors. Mounting on the 1:12 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 150 mm 22330-cck-w33, checked with feeler gauges before and after drive-up.",
    "applications": [
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "split-housing plummer block arrangements with bearings swapped in situ",
      "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still"
    ],
    "pitfalls": [
      "At 150 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 22300-series series at 150 mm bore (320×108 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 2,000 r/min ceiling.",
      "The 22330-cck-w33 and its cylindrical-bore counterpart 22330-cc-w33 share envelope and load ratings (1539/1760 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 108 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 1539/1760 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22330 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22330-cck-w33?",
        "a": "The SKF 22330 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 150 mm nominal bore, 320 mm outer diameter and 108 mm width (5.906 × 12.598 × 4.252 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1539 kN, C0 1760 kN, Pu 146 kN, reference speed 1,600 r/min, limiting speed 2,000 r/min, mass about 47500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 22330-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 22330-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 150 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 22330-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 22330-cck-w33 and 22330-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 1539/1760 kN ratings, but 22330-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22330-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22330",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 22330; identical ISO 15 envelope, fits H2330 adapter sleeve on a 110 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22330-CCK-W33",
      "SKF 22330 CCK/W33",
      "22330 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23032-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23032 CCK/W33",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 240,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 614,
    "static_load_kN": 880,
    "fatigue_load_limit_kN": 83,
    "max_rpm": 3000,
    "reference_speed_rpm": 2400,
    "limiting_speed_rpm": 3000,
    "weight_g": 14500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF lists SKF 23032 CCK/W33 as the adapter-sleeve execution in the 23000-series range: a 160 mm nominal-bore spherical roller bearing whose 1:12 tapered inner ring is driven up a sleeve, with 240 mm OD and 60 mm width to the ISO 15 envelope. Reading the designation: the leading 2 marks a spherical roller bearing, the 30 is the ISO 15 dimension series (dimension series 30 (slim OD, extra-wide)), and the last two digits encode the 160 mm bore; the 240 mm OD and 60 mm width follow the ISO 15 general plan. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. With C 614 kN and C0 880 kN, the 23032-cck-w33 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. Because driving up the 1:12 taper consumes radial clearance, K executions are commonly ordered with C3 initial clearance so the residual running clearance after mounting matches the cylindrical-bore 23032-cc-w33 on an interference seat.",
    "applications": [
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "stepped shafts fitted with withdrawal sleeves against a fixed shoulder",
      "fan and pulley shafts that need periodic bearing removal in the field"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals"
    ],
    "pitfalls": [
      "At 160 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23000-series series at 160 mm bore (240×60 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The 23032-cck-w33 and its cylindrical-bore counterpart 23032-cc-w33 share envelope and load ratings (614/880 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "The 23032-cck-w33 and its cylindrical-bore counterpart 23032-cc-w33 share envelope and load ratings (614/880 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "The 23032-cck-w33 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 614/880 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 614/880 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23032 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23032-cck-w33?",
        "a": "The SKF 23032 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 160 mm nominal bore, 240 mm outer diameter and 60 mm width (6.299 × 9.449 × 2.362 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 614 kN, C0 880 kN, Pu 83 kN, reference speed 2,400 r/min, limiting speed 3,000 r/min, mass about 14500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23032-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23032-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 160 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23032-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23032-cck-w33 and 23032-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 614/880 kN ratings, but 23032-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23032-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23032",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23032; identical ISO 15 envelope, fits H3032 adapter sleeve on a 110 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23032-CCK-W33",
      "SKF 23032 CCK/W33",
      "23032 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23132-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23132 CCK/W33",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 270,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1029,
    "static_load_kN": 1370,
    "fatigue_load_limit_kN": 129,
    "max_rpm": 2400,
    "reference_speed_rpm": 1900,
    "limiting_speed_rpm": 2400,
    "weight_g": 27500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF lists SKF 23132 CCK/W33 as the adapter-sleeve execution in the 23100-series range: a 160 mm nominal-bore spherical roller bearing whose 1:12 tapered inner ring is driven up a sleeve, with 270 mm OD and 86 mm width to the ISO 15 envelope. Digit by digit, 23132-cck-w33 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 31, and bore reference 32 resolving to 160 mm; 270 mm OD and 86 mm width are the matching ISO 15 boundary values. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. The 55.0 mm radial section height ((270−160)/2) and 27500 g catalogue mass frame a 160 mm bore bearing rated at 1029 kN C — roughly 6.43 kN of dynamic capacity per millimetre of bore before application factors. Over-driving the 23132-cck-w33 up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.",
    "applications": [
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "At 160 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23100-series series at 160 mm bore (270×86 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 86 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 160 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23132-cck-w33 with different sleeves.",
      "The 27500 g mass and 86 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23132-cck-w33.",
      "The 1029/1370 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23132 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23132-cck-w33?",
        "a": "The SKF 23132 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 160 mm nominal bore, 270 mm outer diameter and 86 mm width (6.299 × 10.63 × 3.386 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1029 kN, C0 1370 kN, Pu 129 kN, reference speed 1,900 r/min, limiting speed 2,400 r/min, mass about 27500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23132-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23132-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 160 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23132-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23132-cck-w33 and 23132-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 1029/1370 kN ratings, but 23132-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23132-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23132",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23132; identical ISO 15 envelope, fits H3132 adapter sleeve on a 110 mm shaft."
      },
      {
        "equiv_sku": "C3132",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3132 shares the 160×270×86 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C3132-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3132 K shares the 160×270×86 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23132-CCK-W33",
      "SKF 23132 CCK/W33",
      "23132 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22232-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 22232 CCK/W33",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1043,
    "static_load_kN": 1290,
    "fatigue_load_limit_kN": 118,
    "max_rpm": 2800,
    "reference_speed_rpm": 2000,
    "limiting_speed_rpm": 2800,
    "weight_g": 29500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For sleeve mounting on a 160 mm shaft, SKF order number SKF 22232 CCK/W33 is the 1:12 tapered-bore spherical roller bearing in the 22200-series family (dimension series 22 (medium OD, wide)); the cylindrical-bore equivalent is a separate order number, 22232-cc-w33. Reading the designation: the leading 2 marks a spherical roller bearing, the 22 is the ISO 15 dimension series (dimension series 22 (medium OD, wide)), and the last two digits encode the 160 mm bore; the 290 mm OD and 80 mm width follow the ISO 15 general plan. Reading the suffix on 22232-cck-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 22232-cc-w33. Selection arithmetic: the C0/C ratio is about 1.24 (static 1290 kN against dynamic 1043 kN), typical of a spherical roller sized for heavy combined loads, and the 118 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Over-driving the 22232-cck-w33 up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.",
    "applications": [
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat",
      "split-housing plummer block arrangements with bearings swapped in situ"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "smearing on the roller-raceway contact during skid starts below the minimum load"
    ],
    "pitfalls": [
      "At 160 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 22200-series series at 160 mm bore (290×80 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.",
      "The 22232-cck-w33 and its cylindrical-bore counterpart 22232-cc-w33 share envelope and load ratings (1043/1290 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 80 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "The 29500 g mass and 80 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 22232-cck-w33.",
      "The 1043/1290 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22232 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22232-cck-w33?",
        "a": "The SKF 22232 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 160 mm nominal bore, 290 mm outer diameter and 80 mm width (6.299 × 11.417 × 3.15 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1043 kN, C0 1290 kN, Pu 118 kN, reference speed 2,000 r/min, limiting speed 2,800 r/min, mass about 29500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 22232-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 22232-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 160 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 22232-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 22232-cck-w33 and 22232-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 1043/1290 kN ratings, but 22232-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22232-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22232",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 22232; identical ISO 15 envelope, fits H3132 adapter sleeve on a 110 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22232-CCK-W33",
      "SKF 22232 CCK/W33",
      "22232 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23232-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23232 CCK/W33",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 104,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1281,
    "static_load_kN": 1660,
    "fatigue_load_limit_kN": 153,
    "max_rpm": 2200,
    "reference_speed_rpm": 1500,
    "limiting_speed_rpm": 2200,
    "weight_g": 39000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For sleeve mounting on a 160 mm shaft, SKF order number SKF 23232 CCK/W33 is the 1:12 tapered-bore spherical roller bearing in the 23200-series family (dimension series 32 (medium OD, extra wide)); the cylindrical-bore equivalent is a separate order number, 23232-cc-w33. Numbering ties the bearing to its envelope: 23232-cck-w33 means spherical-roller type, dimension series 32, 160 mm bore — which is why the 290×104 mm outline swaps dimensionally with other ISO 15 bearings of the same code. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. Selection arithmetic: the C0/C ratio is about 1.30 (static 1660 kN against dynamic 1281 kN), typical of a spherical roller sized for heavy combined loads, and the 153 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Mounting on the 1:12 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 160 mm 23232-cck-w33, checked with feeler gauges before and after drive-up.",
    "applications": [
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat",
      "split-housing plummer block arrangements with bearings swapped in situ"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "At 160 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23200-series series at 160 mm bore (290×104 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 104 mm width changes abutment spacing, even though the 290 mm OD matches.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 160 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23232-cck-w33 with different sleeves.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 104 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23232-cck-w33 pits long before its L10 life.",
      "The 1281/1660 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23232 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23232-cck-w33?",
        "a": "The SKF 23232 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 160 mm nominal bore, 290 mm outer diameter and 104 mm width (6.299 × 11.417 × 4.094 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1281 kN, C0 1660 kN, Pu 153 kN, reference speed 1,500 r/min, limiting speed 2,200 r/min, mass about 39000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23232-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23232-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 160 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23232-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23232-cck-w33 and 23232-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 1281/1660 kN ratings, but 23232-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23232-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23232",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23232; identical ISO 15 envelope, fits H2332 adapter sleeve on a 110 mm shaft."
      },
      {
        "equiv_sku": "C3232",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 3232 shares the 160×290×104 mm envelope but catalogue C/C0 differ (1370/1830 kN vs 1281/1660 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C3232-K",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 3232 K shares the 160×290×104 mm envelope but catalogue C/C0 differ (1370/1830 kN vs 1281/1660 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23232-CCK-W33",
      "SKF 23232 CCK/W33",
      "23232 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23034-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23034 CCK/W33",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 260,
    "B_mm": 67,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 745,
    "static_load_kN": 1060,
    "fatigue_load_limit_kN": 100,
    "max_rpm": 2800,
    "reference_speed_rpm": 2200,
    "limiting_speed_rpm": 2800,
    "weight_g": 18500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF lists SKF 23034 CCK/W33 as the adapter-sleeve execution in the 23000-series range: a 170 mm nominal-bore spherical roller bearing whose 1:12 tapered inner ring is driven up a sleeve, with 260 mm OD and 67 mm width to the ISO 15 envelope. Numbering ties the bearing to its envelope: 23034-cck-w33 means spherical-roller type, dimension series 30, 170 mm bore — which is why the 260×67 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. Selection arithmetic: the C0/C ratio is about 1.42 (static 1060 kN against dynamic 745 kN), typical of a spherical roller sized for heavy combined loads, and the 100 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. On an H adapter sleeve the 170 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 23034-cck-w33 inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.",
    "applications": [
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal",
      "stepped shafts fitted with withdrawal sleeves against a fixed shoulder"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems"
    ],
    "pitfalls": [
      "At 170 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23000-series series at 170 mm bore (260×67 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 170 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23034-cck-w33 with different sleeves.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 67 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "Catalogue reference speed and limiting speed are different limits: the 2,200 r/min reference is a thermal criterion under load, while the 2,800 r/min limiting value is the mechanical ceiling — observe both.",
      "The 745/1060 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23034 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23034-cck-w33?",
        "a": "The SKF 23034 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 170 mm nominal bore, 260 mm outer diameter and 67 mm width (6.693 × 10.236 × 2.638 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 745 kN, C0 1060 kN, Pu 100 kN, reference speed 2,200 r/min, limiting speed 2,800 r/min, mass about 18500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23034-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23034-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 170 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23034-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23034-cck-w33 and 23034-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 745/1060 kN ratings, but 23034-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23034-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23034",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23034; identical ISO 15 envelope, fits H3034 adapter sleeve on a 110 mm shaft."
      },
      {
        "equiv_sku": "C3034-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3034 M shares the 170×260×67 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23034-CCK-W33",
      "SKF 23034 CCK/W33",
      "23034 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23134-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23134 CCK/W33",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 280,
    "B_mm": 88,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1086,
    "static_load_kN": 1500,
    "fatigue_load_limit_kN": 137,
    "max_rpm": 2400,
    "reference_speed_rpm": 1800,
    "limiting_speed_rpm": 2400,
    "weight_g": 29500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For sleeve mounting on a 170 mm shaft, SKF order number SKF 23134 CCK/W33 is the 1:12 tapered-bore spherical roller bearing in the 23100-series family (dimension series 31 (medium OD, wide)); the cylindrical-bore equivalent is a separate order number, 23134-cc-w33. On the SKF nameplate, 23134-cck-w33 follows the ISO 15 convention: 2 for the spherical roller type, 31 for the dimension series 31 (medium OD, wide), final digits 34 for the 170 mm bore. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. The 137 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.38 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. Because driving up the 1:12 taper consumes radial clearance, K executions are commonly ordered with C3 initial clearance so the residual running clearance after mounting matches the cylindrical-bore 23134-cc-w33 on an interference seat.",
    "applications": [
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "split-housing plummer block arrangements with bearings swapped in situ",
      "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems"
    ],
    "pitfalls": [
      "At 170 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23100-series series at 170 mm bore (280×88 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23134-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "The 23134-cck-w33 and its cylindrical-bore counterpart 23134-cc-w33 share envelope and load ratings (1086/1500 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "The 29500 g mass and 88 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23134-cck-w33.",
      "The 1086/1500 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23134 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23134-cck-w33?",
        "a": "The SKF 23134 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 170 mm nominal bore, 280 mm outer diameter and 88 mm width (6.693 × 11.024 × 3.465 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1086 kN, C0 1500 kN, Pu 137 kN, reference speed 1,800 r/min, limiting speed 2,400 r/min, mass about 29500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23134-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23134-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 170 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23134-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23134-cck-w33 and 23134-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 1086/1500 kN ratings, but 23134-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23134-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23134",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23134; identical ISO 15 envelope, fits H3134 adapter sleeve on a 110 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23134-CCK-W33",
      "SKF 23134 CCK/W33",
      "23134 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23234-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23234 CCK/W33",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 110,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1472,
    "static_load_kN": 1930,
    "fatigue_load_limit_kN": 173,
    "max_rpm": 2000,
    "reference_speed_rpm": 1400,
    "limiting_speed_rpm": 2000,
    "weight_g": 46500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF 23234 CCK/W33 in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:12), intended for an H-series adapter sleeve or AH withdrawal sleeve, with two pressed-steel cages with a floating guide ring and the same 170×310×110 mm ISO 15 outline as its cylindrical-bore counterpart. The code breaks down as type digit 2 (double-row spherical roller), dimension series 32 (dimension series 32 (medium OD, extra wide)), and bore code 34 = 170 mm; dimensions 170×310×110 mm therefore match the ISO 15 envelope. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. With C 1472 kN and C0 1930 kN, the 23234-cck-w33 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. At 170 mm bore, dismount after service is by KM locknut reversal or a hydraulic nut on larger sizes; oil-injection grooves on the bigger sleeves let pressurised oil float the 23234-cck-w33 off the taper without scoring either surface.",
    "applications": [
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "fan and pulley shafts that need periodic bearing removal in the field",
      "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems"
    ],
    "pitfalls": [
      "At 170 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23200-series series at 170 mm bore (310×110 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 110 mm width changes abutment spacing, even though the 310 mm OD matches.",
      "The 23234-cck-w33 and its cylindrical-bore counterpart 23234-cc-w33 share envelope and load ratings (1472/1930 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23234-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23234-cck-w33 pits long before its L10 life.",
      "The 1472/1930 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23234 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23234-cck-w33?",
        "a": "The SKF 23234 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 170 mm nominal bore, 310 mm outer diameter and 110 mm width (6.693 × 12.205 × 4.331 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1472 kN, C0 1930 kN, Pu 173 kN, reference speed 1,400 r/min, limiting speed 2,000 r/min, mass about 46500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23234-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23234-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 170 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23234-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23234-cck-w33 and 23234-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 1472/1930 kN ratings, but 23234-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23234-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23234",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23234; identical ISO 15 envelope, fits H2334 adapter sleeve on a 110 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23234-CCK-W33",
      "SKF 23234 CCK/W33",
      "23234 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23936-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23936 CCK/W33",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 250,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 519,
    "static_load_kN": 830,
    "fatigue_load_limit_kN": 76.5,
    "max_rpm": 2800,
    "reference_speed_rpm": 2600,
    "limiting_speed_rpm": 2800,
    "weight_g": 13500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF 23936 CCK/W33 in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:12), intended for an H-series adapter sleeve or AH withdrawal sleeve, with two pressed-steel cages with a floating guide ring and the same 180×250×52 mm ISO 15 outline as its cylindrical-bore counterpart. Digit by digit, 23936-cck-w33 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 39, and bore reference 36 resolving to 180 mm; 250 mm OD and 52 mm width are the matching ISO 15 boundary values. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. The 35.0 mm radial section height ((250−180)/2) and 13500 g catalogue mass frame a 180 mm bore bearing rated at 519 kN C — roughly 2.88 kN of dynamic capacity per millimetre of bore before application factors. Because driving up the 1:12 taper consumes radial clearance, K executions are commonly ordered with C3 initial clearance so the residual running clearance after mounting matches the cylindrical-bore 23936-cc-w33 on an interference seat.",
    "applications": [
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "stepped shafts fitted with withdrawal sleeves against a fixed shoulder",
      "fan and pulley shafts that need periodic bearing removal in the field"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals"
    ],
    "pitfalls": [
      "At 180 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23900-series series at 180 mm bore (250×52 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 180 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23936-cck-w33 with different sleeves.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 180 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23936-cck-w33 with different sleeves.",
      "Catalogue reference speed and limiting speed are different limits: the 2,600 r/min reference is a thermal criterion under load, while the 2,800 r/min limiting value is the mechanical ceiling — observe both.",
      "The 519/830 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23936 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23936-cck-w33?",
        "a": "The SKF 23936 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 180 mm nominal bore, 250 mm outer diameter and 52 mm width (7.087 × 9.843 × 2.047 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 519 kN, C0 830 kN, Pu 76.5 kN, reference speed 2,600 r/min, limiting speed 2,800 r/min, mass about 13500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23936-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23936-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 180 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23936-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23936-cck-w33 and 23936-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 519/830 kN ratings, but 23936-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23936-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23936",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23936; identical ISO 15 envelope, fits H3936 adapter sleeve on a 160 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23936-CCK-W33",
      "SKF 23936 CCK/W33",
      "23936 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23036-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23036 CCK/W33",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 280,
    "B_mm": 74,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 883,
    "static_load_kN": 1250,
    "fatigue_load_limit_kN": 114,
    "max_rpm": 2600,
    "reference_speed_rpm": 2000,
    "limiting_speed_rpm": 2600,
    "weight_g": 23000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For sleeve mounting on a 180 mm shaft, SKF order number SKF 23036 CCK/W33 is the 1:12 tapered-bore spherical roller bearing in the 23000-series family (dimension series 30 (slim OD, extra-wide)); the cylindrical-bore equivalent is a separate order number, 23036-cc-w33. The code breaks down as type digit 2 (double-row spherical roller), dimension series 30 (dimension series 30 (slim OD, extra-wide)), and bore code 36 = 180 mm; dimensions 180×280×74 mm therefore match the ISO 15 envelope. Reading the suffix on 23036-cck-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 23036-cc-w33. With C 883 kN and C0 1250 kN, the 23036-cck-w33 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. After drive-up, re-check radial clearance and then swing the outer ring through its self-aligning range: the sphered raceway of the 23036-cck-w33 must still tilt ≈ 0.5–2.5° freely — a joint that binds after sleeve mounting signals excessive drive-up or a cocked sleeve.",
    "applications": [
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "smearing on the roller-raceway contact during skid starts below the minimum load"
    ],
    "pitfalls": [
      "At 180 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23000-series series at 180 mm bore (280×74 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The 23036-cck-w33 and its cylindrical-bore counterpart 23036-cc-w33 share envelope and load ratings (883/1250 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23036-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "Catalogue reference speed and limiting speed are different limits: the 2,000 r/min reference is a thermal criterion under load, while the 2,600 r/min limiting value is the mechanical ceiling — observe both.",
      "The 883/1250 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23036 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23036-cck-w33?",
        "a": "The SKF 23036 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 180 mm nominal bore, 280 mm outer diameter and 74 mm width (7.087 × 11.024 × 2.913 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 883 kN, C0 1250 kN, Pu 114 kN, reference speed 2,000 r/min, limiting speed 2,600 r/min, mass about 23000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23036-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23036-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 180 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23036-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23036-cck-w33 and 23036-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 883/1250 kN ratings, but 23036-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23036-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23036",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23036; identical ISO 15 envelope, fits H3036 adapter sleeve on a 160 mm shaft."
      },
      {
        "equiv_sku": "C3036",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3036 shares the 180×280×74 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C3036-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3036 K shares the 180×280×74 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23036-CCK-W33",
      "SKF 23036 CCK/W33",
      "23036 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23136-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23136 CCK/W33",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 300,
    "B_mm": 96,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1263,
    "static_load_kN": 1760,
    "fatigue_load_limit_kN": 160,
    "max_rpm": 2200,
    "reference_speed_rpm": 1700,
    "limiting_speed_rpm": 2200,
    "weight_g": 37000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For sleeve mounting on a 180 mm shaft, SKF order number SKF 23136 CCK/W33 is the 1:12 tapered-bore spherical roller bearing in the 23100-series family (dimension series 31 (medium OD, wide)); the cylindrical-bore equivalent is a separate order number, 23136-cc-w33. Reading the designation: the leading 2 marks a spherical roller bearing, the 31 is the ISO 15 dimension series (dimension series 31 (medium OD, wide)), and the last two digits encode the 180 mm bore; the 300 mm OD and 96 mm width follow the ISO 15 general plan. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. Speed planning uses two different ceilings: 1,700 r/min thermal reference and 2,200 r/min mechanical limiting speed. Mounting on the 1:12 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 180 mm 23136-cck-w33, checked with feeler gauges before and after drive-up.",
    "applications": [
      "large mining crusher main shafts",
      "wind-turbine main shaft support",
      "fan and pulley shafts that need periodic bearing removal in the field",
      "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At 180 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23100-series series at 180 mm bore (300×96 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 96 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 180 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23136-cck-w33 with different sleeves.",
      "The 37000 g mass and 96 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23136-cck-w33.",
      "The 1263/1760 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23136 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23136-cck-w33?",
        "a": "The SKF 23136 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 180 mm nominal bore, 300 mm outer diameter and 96 mm width (7.087 × 11.811 × 3.78 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1263 kN, C0 1760 kN, Pu 160 kN, reference speed 1,700 r/min, limiting speed 2,200 r/min, mass about 37000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23136-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23136-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 180 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23136-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23136-cck-w33 and 23136-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 1263/1760 kN ratings, but 23136-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23136-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23136",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23136; identical ISO 15 envelope, fits H3136 adapter sleeve on a 160 mm shaft."
      },
      {
        "equiv_sku": "C3136",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3136 shares the 180×300×96 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C3136-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3136 K shares the 180×300×96 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23136-CCK-W33",
      "SKF 23136 CCK/W33",
      "23136 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23236-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23236 CCK/W33",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 112,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1557,
    "static_load_kN": 2120,
    "fatigue_load_limit_kN": 186,
    "max_rpm": 1900,
    "reference_speed_rpm": 1300,
    "limiting_speed_rpm": 1900,
    "weight_g": 49500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF 23236 CCK/W33 in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:12), intended for an H-series adapter sleeve or AH withdrawal sleeve, with two pressed-steel cages with a floating guide ring and the same 180×320×112 mm ISO 15 outline as its cylindrical-bore counterpart. Digit by digit, 23236-cck-w33 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 32, and bore reference 36 resolving to 180 mm; 320 mm OD and 112 mm width are the matching ISO 15 boundary values. Reading the suffix on 23236-cck-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 23236-cc-w33. Selection arithmetic: the C0/C ratio is about 1.36 (static 2120 kN against dynamic 1557 kN), typical of a spherical roller sized for heavy combined loads, and the 186 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Because driving up the 1:12 taper consumes radial clearance, K executions are commonly ordered with C3 initial clearance so the residual running clearance after mounting matches the cylindrical-bore 23236-cc-w33 on an interference seat.",
    "applications": [
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "stepped shafts fitted with withdrawal sleeves against a fixed shoulder",
      "fan and pulley shafts that need periodic bearing removal in the field"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "At 180 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23200-series series at 180 mm bore (320×112 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 112 mm width changes abutment spacing, even though the 320 mm OD matches.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 180 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23236-cck-w33 with different sleeves.",
      "The 23236-cck-w33 and its cylindrical-bore counterpart 23236-cc-w33 share envelope and load ratings (1557/2120 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 1557/2120 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23236 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23236-cck-w33?",
        "a": "The SKF 23236 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 180 mm nominal bore, 320 mm outer diameter and 112 mm width (7.087 × 12.598 × 4.409 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1557 kN, C0 2120 kN, Pu 186 kN, reference speed 1,300 r/min, limiting speed 1,900 r/min, mass about 49500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23236-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23236-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 180 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23236-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23236-cck-w33 and 23236-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 1557/2120 kN ratings, but 23236-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23236-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23236",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23236; identical ISO 15 envelope, fits H2336 adapter sleeve on a 160 mm shaft."
      },
      {
        "equiv_sku": "C3236",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3236 shares the 180×320×112 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C3236-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3236 K shares the 180×320×112 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23236-CCK-W33",
      "SKF 23236 CCK/W33",
      "23236 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23938-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23938 CCK/W33",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 190,
    "D_mm": 260,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 499,
    "static_load_kN": 800,
    "fatigue_load_limit_kN": 76.5,
    "max_rpm": 2600,
    "reference_speed_rpm": 2400,
    "limiting_speed_rpm": 2600,
    "weight_g": 14500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF 23938 CCK/W33 in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:12), intended for an H-series adapter sleeve or AH withdrawal sleeve, with two pressed-steel cages with a floating guide ring and the same 190×260×52 mm ISO 15 outline as its cylindrical-bore counterpart. On the SKF nameplate, 23938-cck-w33 follows the ISO 15 convention: 2 for the spherical roller type, 39 for the dimension series 39 (compact OD, narrow), final digits 38 for the 190 mm bore. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. The 76.5 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.60 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. Mounting on the 1:12 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 190 mm 23938-cck-w33, checked with feeler gauges before and after drive-up.",
    "applications": [
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "At 190 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23900-series series at 190 mm bore (260×52 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The 23938-cck-w33 and its cylindrical-bore counterpart 23938-cc-w33 share envelope and load ratings (499/800 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "The 23938-cck-w33 and its cylindrical-bore counterpart 23938-cc-w33 share envelope and load ratings (499/800 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "Catalogue reference speed and limiting speed are different limits: the 2,400 r/min reference is a thermal criterion under load, while the 2,600 r/min limiting value is the mechanical ceiling — observe both.",
      "The 499/800 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23938 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23938-cck-w33?",
        "a": "The SKF 23938 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 190 mm nominal bore, 260 mm outer diameter and 52 mm width (7.48 × 10.236 × 2.047 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 499 kN, C0 800 kN, Pu 76.5 kN, reference speed 2,400 r/min, limiting speed 2,600 r/min, mass about 14500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23938-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23938-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 190 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23938-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23938-cck-w33 and 23938-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 499/800 kN ratings, but 23938-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23938-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23938",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23938; identical ISO 15 envelope, fits H3938 adapter sleeve on a 170 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23938-CCK-W33",
      "SKF 23938 CCK/W33",
      "23938 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23038-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23038 CCK/W33",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 190,
    "D_mm": 290,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 916,
    "static_load_kN": 1340,
    "fatigue_load_limit_kN": 122,
    "max_rpm": 2400,
    "reference_speed_rpm": 1900,
    "limiting_speed_rpm": 2400,
    "weight_g": 25000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For sleeve mounting on a 190 mm shaft, SKF order number SKF 23038 CCK/W33 is the 1:12 tapered-bore spherical roller bearing in the 23000-series family (dimension series 30 (slim OD, extra-wide)); the cylindrical-bore equivalent is a separate order number, 23038-cc-w33. Digit by digit, 23038-cck-w33 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 30, and bore reference 38 resolving to 190 mm; 290 mm OD and 75 mm width are the matching ISO 15 boundary values. Reading the suffix on 23038-cck-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 23038-cc-w33. At 1,900 r/min reference speed the 50.0 mm-section 23038-cck-w33 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 2,400 r/min as the mechanical ceiling. Because driving up the 1:12 taper consumes radial clearance, K executions are commonly ordered with C3 initial clearance so the residual running clearance after mounting matches the cylindrical-bore 23038-cc-w33 on an interference seat.",
    "applications": [
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts",
      "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat",
      "split-housing plummer block arrangements with bearings swapped in situ"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "At 190 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23000-series series at 190 mm bore (290×75 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 190 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23038-cck-w33 with different sleeves.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 75 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "Catalogue reference speed and limiting speed are different limits: the 1,900 r/min reference is a thermal criterion under load, while the 2,400 r/min limiting value is the mechanical ceiling — observe both.",
      "The 916/1340 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23038 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23038-cck-w33?",
        "a": "The SKF 23038 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 190 mm nominal bore, 290 mm outer diameter and 75 mm width (7.48 × 11.417 × 2.953 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 916 kN, C0 1340 kN, Pu 122 kN, reference speed 1,900 r/min, limiting speed 2,400 r/min, mass about 25000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23038-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23038-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 190 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23038-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23038-cck-w33 and 23038-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 916/1340 kN ratings, but 23038-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23038-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23038",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23038; identical ISO 15 envelope, fits H3038 adapter sleeve on a 170 mm shaft."
      },
      {
        "equiv_sku": "C3038",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3038 shares the 190×290×75 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C3038-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3038 K shares the 190×290×75 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23038-CCK-W33",
      "SKF 23038 CCK/W33",
      "23038 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23138-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23138 CCK/W33",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 190,
    "D_mm": 320,
    "B_mm": 104,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1456,
    "static_load_kN": 2080,
    "fatigue_load_limit_kN": 183,
    "max_rpm": 2000,
    "reference_speed_rpm": 1500,
    "limiting_speed_rpm": 2000,
    "weight_g": 44500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF 23138 CCK/W33 in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:12), intended for an H-series adapter sleeve or AH withdrawal sleeve, with two pressed-steel cages with a floating guide ring and the same 190×320×104 mm ISO 15 outline as its cylindrical-bore counterpart. Numbering ties the bearing to its envelope: 23138-cck-w33 means spherical-roller type, dimension series 31, 190 mm bore — which is why the 320×104 mm outline swaps dimensionally with other ISO 15 bearings of the same code. Reading the suffix on 23138-cck-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 23138-cc-w33. Catalogue mass 44500 g for the 190×320×104 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. At 190 mm bore, dismount after service is by KM locknut reversal or a hydraulic nut on larger sizes; oil-injection grooves on the bigger sleeves let pressurised oil float the 23138-cck-w33 off the taper without scoring either surface.",
    "applications": [
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "stepped shafts fitted with withdrawal sleeves against a fixed shoulder",
      "fan and pulley shafts that need periodic bearing removal in the field"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "At 190 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23100-series series at 190 mm bore (320×104 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23138-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "The 23138-cck-w33 and its cylindrical-bore counterpart 23138-cc-w33 share envelope and load ratings (1456/2080 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "The 44500 g mass and 104 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23138-cck-w33.",
      "The 1456/2080 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23138 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23138-cck-w33?",
        "a": "The SKF 23138 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 190 mm nominal bore, 320 mm outer diameter and 104 mm width (7.48 × 12.598 × 4.094 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1456 kN, C0 2080 kN, Pu 183 kN, reference speed 1,500 r/min, limiting speed 2,000 r/min, mass about 44500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23138-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23138-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 190 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23138-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23138-cck-w33 and 23138-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 1456/2080 kN ratings, but 23138-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23138-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23138",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23138; identical ISO 15 envelope, fits H3138 adapter sleeve on a 170 mm shaft."
      },
      {
        "equiv_sku": "C3138-V",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 3138 V shares the 190×320×104 mm envelope but catalogue C/C0 differ (1700/2550 kN vs 1456/2080 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C3138-KV",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 3138 KV shares the 190×320×104 mm envelope but catalogue C/C0 differ (1700/2550 kN vs 1456/2080 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23138-CCK-W33",
      "SKF 23138 CCK/W33",
      "23138 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23238-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23238 CCK/W33",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 120,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1759,
    "static_load_kN": 2400,
    "fatigue_load_limit_kN": 208,
    "max_rpm": 1800,
    "reference_speed_rpm": 1300,
    "limiting_speed_rpm": 1800,
    "weight_g": 59000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23238-cck-w33 is the 1:12 tapered-bore execution of the 23200-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 23238-cc-w33, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. On the SKF nameplate, 23238-cck-w33 follows the ISO 15 convention: 2 for the spherical roller type, 32 for the dimension series 32 (medium OD, extra wide), final digits 38 for the 190 mm bore. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. With C 1759 kN and C0 2400 kN, the 23238-cck-w33 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. For shafts with a locating shoulder, use an AH withdrawal sleeve instead of an adapter sleeve: the bearing presses against the shoulder and the sleeve is drawn out for dismounting, making the 23238-cck-w33 removable without an induction heater.",
    "applications": [
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal",
      "stepped shafts fitted with withdrawal sleeves against a fixed shoulder"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still"
    ],
    "pitfalls": [
      "At 190 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23200-series series at 190 mm bore (340×120 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 120 mm width changes abutment spacing, even though the 340 mm OD matches.",
      "The 23238-cck-w33 and its cylindrical-bore counterpart 23238-cc-w33 share envelope and load ratings (1759/2400 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 190 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23238-cck-w33 with different sleeves.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 1759/2400 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23238 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23238-cck-w33?",
        "a": "The SKF 23238 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 190 mm nominal bore, 340 mm outer diameter and 120 mm width (7.48 × 13.386 × 4.724 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1759 kN, C0 2400 kN, Pu 208 kN, reference speed 1,300 r/min, limiting speed 1,800 r/min, mass about 59000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23238-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23238-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 190 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23238-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23238-cck-w33 and 23238-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 1759/2400 kN ratings, but 23238-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23238-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23238",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23238; identical ISO 15 envelope, fits H2338 adapter sleeve on a 170 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23238-CCK-W33",
      "SKF 23238 CCK/W33",
      "23238 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23940-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23940 CCK/W33",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 200,
    "D_mm": 280,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 651,
    "static_load_kN": 1040,
    "fatigue_load_limit_kN": 93,
    "max_rpm": 2400,
    "reference_speed_rpm": 2200,
    "limiting_speed_rpm": 2400,
    "weight_g": 19000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The SKF 23940 CCK/W33 is a 200×280×60 mm spherical roller bearing with a 1:12 tapered bore — SKF catalogue execution for sleeve mounting on a 200 mm plain shaft, retaining the double-row self-aligning barrel-roller design. The code breaks down as type digit 2 (double-row spherical roller), dimension series 39 (dimension series 39 (compact OD, narrow)), and bore code 40 = 200 mm; dimensions 200×280×60 mm therefore match the ISO 15 envelope. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. The 93 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.60 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. For shafts with a locating shoulder, use an AH withdrawal sleeve instead of an adapter sleeve: the bearing presses against the shoulder and the sleeve is drawn out for dismounting, making the 23940-cck-w33 removable without an induction heater.",
    "applications": [
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat",
      "split-housing plummer block arrangements with bearings swapped in situ"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "At 200 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23900-series series at 200 mm bore (280×60 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The 23940-cck-w33 and its cylindrical-bore counterpart 23940-cc-w33 share envelope and load ratings (651/1040 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "The 23940-cck-w33 and its cylindrical-bore counterpart 23940-cc-w33 share envelope and load ratings (651/1040 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23940-cck-w33; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 651/1040 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23940 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23940-cck-w33?",
        "a": "The SKF 23940 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 200 mm nominal bore, 280 mm outer diameter and 60 mm width (7.874 × 11.024 × 2.362 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 651 kN, C0 1040 kN, Pu 93 kN, reference speed 2,200 r/min, limiting speed 2,400 r/min, mass about 19000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23940-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23940-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 200 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23940-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23940-cck-w33 and 23940-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 651/1040 kN ratings, but 23940-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23940-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23940",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23940; identical ISO 15 envelope, fits H3940 adapter sleeve on a 180 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23940-CCK-W33",
      "SKF 23940 CCK/W33",
      "23940 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23040-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23040 CCK/W33",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 200,
    "D_mm": 310,
    "B_mm": 82,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1058,
    "static_load_kN": 1530,
    "fatigue_load_limit_kN": 137,
    "max_rpm": 2200,
    "reference_speed_rpm": 1800,
    "limiting_speed_rpm": 2200,
    "weight_g": 31500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23040-cck-w33 is the 1:12 tapered-bore execution of the 23000-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 23040-cc-w33, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. Numbering ties the bearing to its envelope: 23040-cck-w33 means spherical-roller type, dimension series 30, 200 mm bore — which is why the 310×82 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. The 137 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.45 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. On an H adapter sleeve the 200 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 23040-cck-w33 inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.",
    "applications": [
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal",
      "stepped shafts fitted with withdrawal sleeves against a fixed shoulder"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At 200 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23000-series series at 200 mm bore (310×82 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 200 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23040-cck-w33 with different sleeves.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 200 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23040-cck-w33 with different sleeves.",
      "Catalogue reference speed and limiting speed are different limits: the 1,800 r/min reference is a thermal criterion under load, while the 2,200 r/min limiting value is the mechanical ceiling — observe both.",
      "The 1058/1530 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23040 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23040-cck-w33?",
        "a": "The SKF 23040 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 200 mm nominal bore, 310 mm outer diameter and 82 mm width (7.874 × 12.205 × 3.228 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1058 kN, C0 1530 kN, Pu 137 kN, reference speed 1,800 r/min, limiting speed 2,200 r/min, mass about 31500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23040-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23040-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 200 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23040-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23040-cck-w33 and 23040-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 1058/1530 kN ratings, but 23040-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23040-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23040",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23040; identical ISO 15 envelope, fits H3040 adapter sleeve on a 180 mm shaft."
      },
      {
        "equiv_sku": "C3040",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 3040 shares the 200×310×82 mm envelope but catalogue C/C0 differ (1120/1730 kN vs 1058/1530 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C3040-K",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 3040 K shares the 200×310×82 mm envelope but catalogue C/C0 differ (1120/1730 kN vs 1058/1530 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23040-CCK-W33",
      "SKF 23040 CCK/W33",
      "23040 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23140-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23140 CCK/W33",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 200,
    "D_mm": 340,
    "B_mm": 112,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1665,
    "static_load_kN": 2360,
    "fatigue_load_limit_kN": 204,
    "max_rpm": 1900,
    "reference_speed_rpm": 1500,
    "limiting_speed_rpm": 1900,
    "weight_g": 55500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The SKF 23140 CCK/W33 is a 200×340×112 mm spherical roller bearing with a 1:12 tapered bore — SKF catalogue execution for sleeve mounting on a 200 mm plain shaft, retaining the double-row self-aligning barrel-roller design. On the SKF nameplate, 23140-cck-w33 follows the ISO 15 convention: 2 for the spherical roller type, 31 for the dimension series 31 (medium OD, wide), final digits 40 for the 200 mm bore. Reading the suffix on 23140-cck-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 23140-cc-w33. Catalogue mass 55500 g for the 200×340×112 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. Mounting on the 1:12 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 200 mm 23140-cck-w33, checked with feeler gauges before and after drive-up.",
    "applications": [
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "At 200 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23100-series series at 200 mm bore (340×112 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23140-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "The 23140-cck-w33 and its cylindrical-bore counterpart 23140-cc-w33 share envelope and load ratings (1665/2360 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "The 23140-cck-w33 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 1665/2360 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 1665/2360 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23140 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23140-cck-w33?",
        "a": "The SKF 23140 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 200 mm nominal bore, 340 mm outer diameter and 112 mm width (7.874 × 13.386 × 4.409 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1665 kN, C0 2360 kN, Pu 204 kN, reference speed 1,500 r/min, limiting speed 1,900 r/min, mass about 55500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23140-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23140-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 200 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23140-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23140-cck-w33 and 23140-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 1665/2360 kN ratings, but 23140-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23140-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23140",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23140; identical ISO 15 envelope, fits H3140 adapter sleeve on a 180 mm shaft."
      },
      {
        "equiv_sku": "C3140",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3140 shares the 200×340×112 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C3140-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3140 K shares the 200×340×112 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23140-CCK-W33",
      "SKF 23140 CCK/W33",
      "23140 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23240-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23240 CCK/W33",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 200,
    "D_mm": 360,
    "B_mm": 128,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1947,
    "static_load_kN": 2700,
    "fatigue_load_limit_kN": 228,
    "max_rpm": 1700,
    "reference_speed_rpm": 1200,
    "limiting_speed_rpm": 1700,
    "weight_g": 70000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 23240-cck-w33 denotes the tapered-bore version (K suffix, taper 1:12) of the 23200-series spherical roller bearing: dimensioned 200×360×128 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. The code breaks down as type digit 2 (double-row spherical roller), dimension series 32 (dimension series 32 (medium OD, extra wide)), and bore code 40 = 200 mm; dimensions 200×360×128 mm therefore match the ISO 15 envelope. Reading the suffix on 23240-cck-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 23240-cc-w33. The 80.0 mm radial section height ((360−200)/2) and 70000 g catalogue mass frame a 200 mm bore bearing rated at 1947 kN C — roughly 9.73 kN of dynamic capacity per millimetre of bore before application factors. After drive-up, re-check radial clearance and then swing the outer ring through its self-aligning range: the sphered raceway of the 23240-cck-w33 must still tilt ≈ 0.5–2.5° freely — a joint that binds after sleeve mounting signals excessive drive-up or a cocked sleeve.",
    "applications": [
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat",
      "split-housing plummer block arrangements with bearings swapped in situ"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "At 200 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23200-series series at 200 mm bore (360×128 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 128 mm width changes abutment spacing, even though the 360 mm OD matches.",
      "The 23240-cck-w33 and its cylindrical-bore counterpart 23240-cc-w33 share envelope and load ratings (1947/2700 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23240-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 1947/2700 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23240 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23240-cck-w33?",
        "a": "The SKF 23240 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 200 mm nominal bore, 360 mm outer diameter and 128 mm width (7.874 × 14.173 × 5.039 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1947 kN, C0 2700 kN, Pu 228 kN, reference speed 1,200 r/min, limiting speed 1,700 r/min, mass about 70000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23240-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23240-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 200 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23240-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23240-cck-w33 and 23240-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 1947/2700 kN ratings, but 23240-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23240-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23240",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23240; identical ISO 15 envelope, fits H2340 adapter sleeve on a 180 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23240-CCK-W33",
      "SKF 23240 CCK/W33",
      "23240 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23944-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23944 CCK/W33",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 220,
    "D_mm": 300,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 661,
    "static_load_kN": 1080,
    "fatigue_load_limit_kN": 93,
    "max_rpm": 2200,
    "reference_speed_rpm": 2000,
    "limiting_speed_rpm": 2200,
    "weight_g": 22500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 23944-cck-w33 denotes the tapered-bore version (K suffix, taper 1:12) of the 23900-series spherical roller bearing: dimensioned 220×300×60 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. On the SKF nameplate, 23944-cck-w33 follows the ISO 15 convention: 2 for the spherical roller type, 39 for the dimension series 39 (compact OD, narrow), final digits 44 for the 220 mm bore. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. Catalogue mass 22500 g for the 220×300×60 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. On an H adapter sleeve the 220 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 23944-cck-w33 inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.",
    "applications": [
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal",
      "stepped shafts fitted with withdrawal sleeves against a fixed shoulder"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At 220 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23900-series series at 220 mm bore (300×60 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The 23944-cck-w33 and its cylindrical-bore counterpart 23944-cc-w33 share envelope and load ratings (661/1080 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "The 23944-cck-w33 and its cylindrical-bore counterpart 23944-cc-w33 share envelope and load ratings (661/1080 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23944-cck-w33; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 661/1080 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23944 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23944-cck-w33?",
        "a": "The SKF 23944 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 220 mm nominal bore, 300 mm outer diameter and 60 mm width (8.661 × 11.811 × 2.362 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 661 kN, C0 1080 kN, Pu 93 kN, reference speed 2,000 r/min, limiting speed 2,200 r/min, mass about 22500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23944-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23944-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 220 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23944-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23944-cck-w33 and 23944-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 661/1080 kN ratings, but 23944-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23944-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23944",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23944; identical ISO 15 envelope, fits OH3944 adapter sleeve on a 200 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23944-CCK-W33",
      "SKF 23944 CCK/W33",
      "23944 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23044-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23044 CCK/W33",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 220,
    "D_mm": 340,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1261,
    "static_load_kN": 1860,
    "fatigue_load_limit_kN": 163,
    "max_rpm": 2000,
    "reference_speed_rpm": 1600,
    "limiting_speed_rpm": 2000,
    "weight_g": 39500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The SKF 23044 CCK/W33 is a 220×340×90 mm spherical roller bearing with a 1:12 tapered bore — SKF catalogue execution for sleeve mounting on a 220 mm plain shaft, retaining the double-row self-aligning barrel-roller design. Digit by digit, 23044-cck-w33 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 30, and bore reference 44 resolving to 220 mm; 340 mm OD and 90 mm width are the matching ISO 15 boundary values. Reading the suffix on 23044-cck-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 23044-cc-w33. Catalogue mass 39500 g for the 220×340×90 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. Because driving up the 1:12 taper consumes radial clearance, K executions are commonly ordered with C3 initial clearance so the residual running clearance after mounting matches the cylindrical-bore 23044-cc-w33 on an interference seat.",
    "applications": [
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat",
      "split-housing plummer block arrangements with bearings swapped in situ"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "smearing on the roller-raceway contact during skid starts below the minimum load"
    ],
    "pitfalls": [
      "At 220 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23000-series series at 220 mm bore (340×90 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 220 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23044-cck-w33 with different sleeves.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 220 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23044-cck-w33 with different sleeves.",
      "Catalogue reference speed and limiting speed are different limits: the 1,600 r/min reference is a thermal criterion under load, while the 2,000 r/min limiting value is the mechanical ceiling — observe both.",
      "The 1261/1860 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23044 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23044-cck-w33?",
        "a": "The SKF 23044 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 220 mm nominal bore, 340 mm outer diameter and 90 mm width (8.661 × 13.386 × 3.543 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1261 kN, C0 1860 kN, Pu 163 kN, reference speed 1,600 r/min, limiting speed 2,000 r/min, mass about 39500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23044-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23044-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 220 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23044-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23044-cck-w33 and 23044-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 1261/1860 kN ratings, but 23044-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23044-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23044",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23044; identical ISO 15 envelope, fits OH3044 adapter sleeve on a 200 mm shaft."
      },
      {
        "equiv_sku": "C3044",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3044 shares the 220×340×90 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C3044-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3044 K shares the 220×340×90 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23044-CCK-W33",
      "SKF 23044 CCK/W33",
      "23044 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23144-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23144 CCK/W33",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 220,
    "D_mm": 370,
    "B_mm": 120,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1888,
    "static_load_kN": 2750,
    "fatigue_load_limit_kN": 232,
    "max_rpm": 1700,
    "reference_speed_rpm": 1300,
    "limiting_speed_rpm": 1700,
    "weight_g": 67500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 23144-cck-w33 denotes the tapered-bore version (K suffix, taper 1:12) of the 23100-series spherical roller bearing: dimensioned 220×370×120 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. Numbering ties the bearing to its envelope: 23144-cck-w33 means spherical-roller type, dimension series 31, 220 mm bore — which is why the 370×120 mm outline swaps dimensionally with other ISO 15 bearings of the same code. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. With C 1888 kN and C0 2750 kN, the 23144-cck-w33 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. After drive-up, re-check radial clearance and then swing the outer ring through its self-aligning range: the sphered raceway of the 23144-cck-w33 must still tilt ≈ 0.5–2.5° freely — a joint that binds after sleeve mounting signals excessive drive-up or a cocked sleeve.",
    "applications": [
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "fan and pulley shafts that need periodic bearing removal in the field",
      "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 220 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23100-series series at 220 mm bore (370×120 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23144-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "The 23144-cck-w33 and its cylindrical-bore counterpart 23144-cc-w33 share envelope and load ratings (1888/2750 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "The 23144-cck-w33 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 1888/2750 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 1888/2750 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23144 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23144-cck-w33?",
        "a": "The SKF 23144 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 220 mm nominal bore, 370 mm outer diameter and 120 mm width (8.661 × 14.567 × 4.724 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1888 kN, C0 2750 kN, Pu 232 kN, reference speed 1,300 r/min, limiting speed 1,700 r/min, mass about 67500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23144-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23144-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 220 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23144-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23144-cck-w33 and 23144-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 1888/2750 kN ratings, but 23144-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23144-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23144",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23144; identical ISO 15 envelope, fits OH3144 adapter sleeve on a 200 mm shaft."
      },
      {
        "equiv_sku": "C3144",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3144 shares the 220×370×120 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C3144-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3144 K shares the 220×370×120 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23144-CCK-W33",
      "SKF 23144 CCK/W33",
      "23144 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23244-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23244 CCK/W33",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 220,
    "D_mm": 400,
    "B_mm": 144,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 2485,
    "static_load_kN": 3450,
    "fatigue_load_limit_kN": 285,
    "max_rpm": 1500,
    "reference_speed_rpm": 1100,
    "limiting_speed_rpm": 1500,
    "weight_g": 96500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF lists SKF 23244 CCK/W33 as the adapter-sleeve execution in the 23200-series range: a 220 mm nominal-bore spherical roller bearing whose 1:12 tapered inner ring is driven up a sleeve, with 400 mm OD and 144 mm width to the ISO 15 envelope. On the SKF nameplate, 23244-cck-w33 follows the ISO 15 convention: 2 for the spherical roller type, 32 for the dimension series 32 (medium OD, extra wide), final digits 44 for the 220 mm bore. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. Speed planning uses two different ceilings: 1,100 r/min thermal reference and 1,500 r/min mechanical limiting speed. For shafts with a locating shoulder, use an AH withdrawal sleeve instead of an adapter sleeve: the bearing presses against the shoulder and the sleeve is drawn out for dismounting, making the 23244-cck-w33 removable without an induction heater.",
    "applications": [
      "large mining crusher main shafts",
      "wind-turbine main shaft support",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal",
      "stepped shafts fitted with withdrawal sleeves against a fixed shoulder"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 220 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23200-series series at 220 mm bore (400×144 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 144 mm width changes abutment spacing, even though the 400 mm OD matches.",
      "The 23244-cck-w33 and its cylindrical-bore counterpart 23244-cc-w33 share envelope and load ratings (2485/3450 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23244-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 2485/3450 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23244 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23244-cck-w33?",
        "a": "The SKF 23244 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 220 mm nominal bore, 400 mm outer diameter and 144 mm width (8.661 × 15.748 × 5.669 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 2485 kN, C0 3450 kN, Pu 285 kN, reference speed 1,100 r/min, limiting speed 1,500 r/min, mass about 96500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23244-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23244-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 220 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23244-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23244-cck-w33 and 23244-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 2485/3450 kN ratings, but 23244-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23244-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23244",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23244; identical ISO 15 envelope, fits OH2344 adapter sleeve on a 200 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23244-CCK-W33",
      "SKF 23244 CCK/W33",
      "23244 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23948-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23948 CCK/W33",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 240,
    "D_mm": 320,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 685,
    "static_load_kN": 1160,
    "fatigue_load_limit_kN": 98,
    "max_rpm": 2000,
    "reference_speed_rpm": 1900,
    "limiting_speed_rpm": 2000,
    "weight_g": 24500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF lists SKF 23948 CCK/W33 as the adapter-sleeve execution in the 23900-series range: a 240 mm nominal-bore spherical roller bearing whose 1:12 tapered inner ring is driven up a sleeve, with 320 mm OD and 60 mm width to the ISO 15 envelope. Numbering ties the bearing to its envelope: 23948-cck-w33 means spherical-roller type, dimension series 39, 240 mm bore — which is why the 320×60 mm outline swaps dimensionally with other ISO 15 bearings of the same code. Reading the suffix on 23948-cck-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 23948-cc-w33. With C 685 kN and C0 1160 kN, the 23948-cck-w33 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. Because driving up the 1:12 taper consumes radial clearance, K executions are commonly ordered with C3 initial clearance so the residual running clearance after mounting matches the cylindrical-bore 23948-cc-w33 on an interference seat.",
    "applications": [
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat",
      "split-housing plummer block arrangements with bearings swapped in situ"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "smearing on the roller-raceway contact during skid starts below the minimum load"
    ],
    "pitfalls": [
      "At 240 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23900-series series at 240 mm bore (320×60 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The 23948-cck-w33 and its cylindrical-bore counterpart 23948-cc-w33 share envelope and load ratings (685/1160 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "The 23948-cck-w33 and its cylindrical-bore counterpart 23948-cc-w33 share envelope and load ratings (685/1160 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23948-cck-w33; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 685/1160 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23948 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23948-cck-w33?",
        "a": "The SKF 23948 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 240 mm nominal bore, 320 mm outer diameter and 60 mm width (9.449 × 12.598 × 2.362 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 685 kN, C0 1160 kN, Pu 98 kN, reference speed 1,900 r/min, limiting speed 2,000 r/min, mass about 24500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23948-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23948-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 240 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23948-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23948-cck-w33 and 23948-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 685/1160 kN ratings, but 23948-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23948-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23948",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23948; identical ISO 15 envelope, fits OH3948 adapter sleeve on a 220 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23948-CCK-W33",
      "SKF 23948 CCK/W33",
      "23948 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23048-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23048 CCK/W33",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 240,
    "D_mm": 360,
    "B_mm": 92,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1340,
    "static_load_kN": 2080,
    "fatigue_load_limit_kN": 176,
    "max_rpm": 1900,
    "reference_speed_rpm": 1500,
    "limiting_speed_rpm": 1900,
    "weight_g": 44500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 23048-cck-w33 denotes the tapered-bore version (K suffix, taper 1:12) of the 23000-series spherical roller bearing: dimensioned 240×360×92 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. Reading the designation: the leading 2 marks a spherical roller bearing, the 30 is the ISO 15 dimension series (dimension series 30 (slim OD, extra-wide)), and the last two digits encode the 240 mm bore; the 360 mm OD and 92 mm width follow the ISO 15 general plan. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. Catalogue mass 44500 g for the 240×360×92 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. After drive-up, re-check radial clearance and then swing the outer ring through its self-aligning range: the sphered raceway of the 23048-cck-w33 must still tilt ≈ 0.5–2.5° freely — a joint that binds after sleeve mounting signals excessive drive-up or a cocked sleeve.",
    "applications": [
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "stepped shafts fitted with withdrawal sleeves against a fixed shoulder",
      "fan and pulley shafts that need periodic bearing removal in the field"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "At 240 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23000-series series at 240 mm bore (360×92 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 240 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23048-cck-w33 with different sleeves.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 92 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23048-cck-w33; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 1340/2080 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23048 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23048-cck-w33?",
        "a": "The SKF 23048 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 240 mm nominal bore, 360 mm outer diameter and 92 mm width (9.449 × 14.173 × 3.622 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1340 kN, C0 2080 kN, Pu 176 kN, reference speed 1,500 r/min, limiting speed 1,900 r/min, mass about 44500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23048-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23048-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 240 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23048-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23048-cck-w33 and 23048-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 1340/2080 kN ratings, but 23048-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23048-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23048",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23048; identical ISO 15 envelope, fits OH3048 adapter sleeve on a 220 mm shaft."
      },
      {
        "equiv_sku": "C3048",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3048 shares the 240×360×92 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C3048-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3048 K shares the 240×360×92 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23048-CCK-W33",
      "SKF 23048 CCK/W33",
      "23048 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23148-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23148 CCK/W33",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 240,
    "D_mm": 400,
    "B_mm": 128,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 2187,
    "static_load_kN": 3200,
    "fatigue_load_limit_kN": 255,
    "max_rpm": 1600,
    "reference_speed_rpm": 1200,
    "limiting_speed_rpm": 1600,
    "weight_g": 80500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF lists SKF 23148 CCK/W33 as the adapter-sleeve execution in the 23100-series range: a 240 mm nominal-bore spherical roller bearing whose 1:12 tapered inner ring is driven up a sleeve, with 400 mm OD and 128 mm width to the ISO 15 envelope. Digit by digit, 23148-cck-w33 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 31, and bore reference 48 resolving to 240 mm; 400 mm OD and 128 mm width are the matching ISO 15 boundary values. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. The 80.0 mm radial section height ((400−240)/2) and 80500 g catalogue mass frame a 240 mm bore bearing rated at 2187 kN C — roughly 9.11 kN of dynamic capacity per millimetre of bore before application factors. For shafts with a locating shoulder, use an AH withdrawal sleeve instead of an adapter sleeve: the bearing presses against the shoulder and the sleeve is drawn out for dismounting, making the 23148-cck-w33 removable without an induction heater.",
    "applications": [
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "At 240 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23100-series series at 240 mm bore (400×128 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23148-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "The 23148-cck-w33 and its cylindrical-bore counterpart 23148-cc-w33 share envelope and load ratings (2187/3200 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "The 23148-cck-w33 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 2187/3200 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 2187/3200 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23148 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23148-cck-w33?",
        "a": "The SKF 23148 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 240 mm nominal bore, 400 mm outer diameter and 128 mm width (9.449 × 15.748 × 5.039 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 2187 kN, C0 3200 kN, Pu 255 kN, reference speed 1,200 r/min, limiting speed 1,600 r/min, mass about 80500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23148-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23148-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 240 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23148-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23148-cck-w33 and 23148-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 2187/3200 kN ratings, but 23148-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23148-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23148",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23148; identical ISO 15 envelope, fits OH3148 adapter sleeve on a 220 mm shaft."
      },
      {
        "equiv_sku": "C3148",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3148 shares the 240×400×128 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C3148-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3148 K shares the 240×400×128 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23148-CCK-W33",
      "SKF 23148 CCK/W33",
      "23148 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23248-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23248 CCK/W33",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 240,
    "D_mm": 440,
    "B_mm": 160,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 3042,
    "static_load_kN": 4300,
    "fatigue_load_limit_kN": 345,
    "max_rpm": 1300,
    "reference_speed_rpm": 950,
    "limiting_speed_rpm": 1300,
    "weight_g": 125000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For sleeve mounting on a 240 mm shaft, SKF order number SKF 23248 CCK/W33 is the 1:12 tapered-bore spherical roller bearing in the 23200-series family (dimension series 32 (medium OD, extra wide)); the cylindrical-bore equivalent is a separate order number, 23248-cc-w33. Numbering ties the bearing to its envelope: 23248-cck-w33 means spherical-roller type, dimension series 32, 240 mm bore — which is why the 440×160 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. Speed planning uses two different ceilings: 950 r/min thermal reference and 1,300 r/min mechanical limiting speed. Over-driving the 23248-cck-w33 up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.",
    "applications": [
      "large mining crusher main shafts",
      "wind-turbine main shaft support",
      "split-housing plummer block arrangements with bearings swapped in situ",
      "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems"
    ],
    "pitfalls": [
      "At 240 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23200-series series at 240 mm bore (440×160 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 160 mm width changes abutment spacing, even though the 440 mm OD matches.",
      "The 23248-cck-w33 and its cylindrical-bore counterpart 23248-cc-w33 share envelope and load ratings (3042/4300 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 240 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23248-cck-w33 with different sleeves.",
      "The 125000 g mass and 160 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23248-cck-w33.",
      "The 3042/4300 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23248 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23248-cck-w33?",
        "a": "The SKF 23248 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 240 mm nominal bore, 440 mm outer diameter and 160 mm width (9.449 × 17.323 × 6.299 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 3042 kN, C0 4300 kN, Pu 345 kN, reference speed 950 r/min, limiting speed 1,300 r/min, mass about 125000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23248-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23248-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 240 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23248-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23248-cck-w33 and 23248-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 3042/4300 kN ratings, but 23248-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23248-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23248",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23248; identical ISO 15 envelope, fits OH2348 adapter sleeve on a 220 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23248-CCK-W33",
      "SKF 23248 CCK/W33",
      "23248 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23952-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23952 CCK/W33",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 260,
    "D_mm": 360,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1055,
    "static_load_kN": 1800,
    "fatigue_load_limit_kN": 156,
    "max_rpm": 1900,
    "reference_speed_rpm": 1700,
    "limiting_speed_rpm": 1900,
    "weight_g": 35000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23952-cck-w33 is the 1:12 tapered-bore execution of the 23900-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 23952-cc-w33, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. Reading the designation: the leading 2 marks a spherical roller bearing, the 39 is the ISO 15 dimension series (dimension series 39 (compact OD, narrow)), and the last two digits encode the 260 mm bore; the 360 mm OD and 75 mm width follow the ISO 15 general plan. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. At 1,700 r/min reference speed the 50.0 mm-section 23952-cck-w33 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 1,900 r/min as the mechanical ceiling. Because driving up the 1:12 taper consumes radial clearance, K executions are commonly ordered with C3 initial clearance so the residual running clearance after mounting matches the cylindrical-bore 23952-cc-w33 on an interference seat.",
    "applications": [
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal",
      "stepped shafts fitted with withdrawal sleeves against a fixed shoulder"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 260 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23900-series series at 260 mm bore (360×75 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 260 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23952-cck-w33 with different sleeves.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 260 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23952-cck-w33 with different sleeves.",
      "Shaft and housing fillets must clear the bearing chamfer so the 75 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 1055/1800 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23952 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23952-cck-w33?",
        "a": "The SKF 23952 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 260 mm nominal bore, 360 mm outer diameter and 75 mm width (10.236 × 14.173 × 2.953 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1055 kN, C0 1800 kN, Pu 156 kN, reference speed 1,700 r/min, limiting speed 1,900 r/min, mass about 35000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23952-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23952-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 260 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23952-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23952-cck-w33 and 23952-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 1055/1800 kN ratings, but 23952-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23952-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23952",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23952; identical ISO 15 envelope, fits OH3952 adapter sleeve on a 240 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23952-CCK-W33",
      "SKF 23952 CCK/W33",
      "23952 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23052-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23052 CCK/W33",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 260,
    "D_mm": 400,
    "B_mm": 104,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1675,
    "static_load_kN": 2550,
    "fatigue_load_limit_kN": 212,
    "max_rpm": 1700,
    "reference_speed_rpm": 1300,
    "limiting_speed_rpm": 1700,
    "weight_g": 60500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF 23052 CCK/W33 in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:12), intended for an H-series adapter sleeve or AH withdrawal sleeve, with two pressed-steel cages with a floating guide ring and the same 260×400×104 mm ISO 15 outline as its cylindrical-bore counterpart. On the SKF nameplate, 23052-cck-w33 follows the ISO 15 convention: 2 for the spherical roller type, 30 for the dimension series 30 (slim OD, extra-wide), final digits 52 for the 260 mm bore. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. At 1,300 r/min reference speed the 70.0 mm-section 23052-cck-w33 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 1,700 r/min as the mechanical ceiling. At 260 mm bore, dismount after service is by KM locknut reversal or a hydraulic nut on larger sizes; oil-injection grooves on the bigger sleeves let pressurised oil float the 23052-cck-w33 off the taper without scoring either surface.",
    "applications": [
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts",
      "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat",
      "split-housing plummer block arrangements with bearings swapped in situ"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "At 260 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23000-series series at 260 mm bore (400×104 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The 23052-cck-w33 and its cylindrical-bore counterpart 23052-cc-w33 share envelope and load ratings (1675/2550 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "The 23052-cck-w33 and its cylindrical-bore counterpart 23052-cc-w33 share envelope and load ratings (1675/2550 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23052-cck-w33; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 1675/2550 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23052 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23052-cck-w33?",
        "a": "The SKF 23052 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 260 mm nominal bore, 400 mm outer diameter and 104 mm width (10.236 × 15.748 × 4.094 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1675 kN, C0 2550 kN, Pu 212 kN, reference speed 1,300 r/min, limiting speed 1,700 r/min, mass about 60500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23052-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23052-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 260 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23052-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23052-cck-w33 and 23052-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 1675/2550 kN ratings, but 23052-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23052-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23052",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23052; identical ISO 15 envelope, fits OH3052 adapter sleeve on a 240 mm shaft."
      },
      {
        "equiv_sku": "C3052",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 3052 shares the 260×400×104 mm envelope but catalogue C/C0 differ (1760/2850 kN vs 1675/2550 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C3052-K",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 3052 K shares the 260×400×104 mm envelope but catalogue C/C0 differ (1760/2850 kN vs 1675/2550 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23052-CCK-W33",
      "SKF 23052 CCK/W33",
      "23052 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23152-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23152 CCK/W33",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 260,
    "D_mm": 440,
    "B_mm": 144,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 2664,
    "static_load_kN": 3900,
    "fatigue_load_limit_kN": 290,
    "max_rpm": 1400,
    "reference_speed_rpm": 1100,
    "limiting_speed_rpm": 1400,
    "weight_g": 109000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23152-cck-w33 is the 1:12 tapered-bore execution of the 23100-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 23152-cc-w33, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. The code breaks down as type digit 2 (double-row spherical roller), dimension series 31 (dimension series 31 (medium OD, wide)), and bore code 52 = 260 mm; dimensions 260×440×144 mm therefore match the ISO 15 envelope. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. The 290 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.46 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. For shafts with a locating shoulder, use an AH withdrawal sleeve instead of an adapter sleeve: the bearing presses against the shoulder and the sleeve is drawn out for dismounting, making the 23152-cck-w33 removable without an induction heater.",
    "applications": [
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "fan and pulley shafts that need periodic bearing removal in the field",
      "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems"
    ],
    "pitfalls": [
      "At 260 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23100-series series at 260 mm bore (440×144 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 144 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 260 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23152-cck-w33 with different sleeves.",
      "Catalogue reference speed and limiting speed are different limits: the 1,100 r/min reference is a thermal criterion under load, while the 1,400 r/min limiting value is the mechanical ceiling — observe both.",
      "The 2664/3900 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23152 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23152-cck-w33?",
        "a": "The SKF 23152 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 260 mm nominal bore, 440 mm outer diameter and 144 mm width (10.236 × 17.323 × 5.669 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 2664 kN, C0 3900 kN, Pu 290 kN, reference speed 1,100 r/min, limiting speed 1,400 r/min, mass about 109000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23152-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23152-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 260 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23152-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23152-cck-w33 and 23152-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 2664/3900 kN ratings, but 23152-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23152-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23152",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23152; identical ISO 15 envelope, fits OH3152 adapter sleeve on a 240 mm shaft."
      },
      {
        "equiv_sku": "C3152",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3152 shares the 260×440×144 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C3152-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3152 K shares the 260×440×144 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23152-CCK-W33",
      "SKF 23152 CCK/W33",
      "23152 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23252-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23252 CCK/W33",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 260,
    "D_mm": 480,
    "B_mm": 174,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 3395,
    "static_load_kN": 4750,
    "fatigue_load_limit_kN": 360,
    "max_rpm": 1200,
    "reference_speed_rpm": 850,
    "limiting_speed_rpm": 1200,
    "weight_g": 160000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The SKF 23252 CCK/W33 is a 260×480×174 mm spherical roller bearing with a 1:12 tapered bore — SKF catalogue execution for sleeve mounting on a 260 mm plain shaft, retaining the double-row self-aligning barrel-roller design. Reading the designation: the leading 2 marks a spherical roller bearing, the 32 is the ISO 15 dimension series (dimension series 32 (medium OD, extra wide)), and the last two digits encode the 260 mm bore; the 480 mm OD and 174 mm width follow the ISO 15 general plan. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. With C 3395 kN and C0 4750 kN, the 23252-cck-w33 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. On an H adapter sleeve the 260 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 23252-cck-w33 inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.",
    "applications": [
      "heavy rolling-mill work-roll chocks",
      "large dredger and marine winch drums",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal",
      "stepped shafts fitted with withdrawal sleeves against a fixed shoulder"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems"
    ],
    "pitfalls": [
      "At 260 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23200-series series at 260 mm bore (480×174 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 174 mm width changes abutment spacing, even though the 480 mm OD matches.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 260 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23252-cck-w33 with different sleeves.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 174 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "The 160000 g mass and 174 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23252-cck-w33.",
      "The 3395/4750 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23252 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23252-cck-w33?",
        "a": "The SKF 23252 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 260 mm nominal bore, 480 mm outer diameter and 174 mm width (10.236 × 18.898 × 6.85 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 3395 kN, C0 4750 kN, Pu 360 kN, reference speed 850 r/min, limiting speed 1,200 r/min, mass about 160000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23252-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23252-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 260 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23252-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23252-cck-w33 and 23252-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 3395/4750 kN ratings, but 23252-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23252-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23252",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23252; identical ISO 15 envelope, fits OH2352 adapter sleeve on a 240 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23252-CCK-W33",
      "SKF 23252 CCK/W33",
      "23252 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23956-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23956 CCK/W33",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 280,
    "D_mm": 380,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1016,
    "static_load_kN": 1760,
    "fatigue_load_limit_kN": 143,
    "max_rpm": 1700,
    "reference_speed_rpm": 1600,
    "limiting_speed_rpm": 1700,
    "weight_g": 40000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The SKF 23956 CCK/W33 is a 280×380×75 mm spherical roller bearing with a 1:12 tapered bore — SKF catalogue execution for sleeve mounting on a 280 mm plain shaft, retaining the double-row self-aligning barrel-roller design. The code breaks down as type digit 2 (double-row spherical roller), dimension series 39 (dimension series 39 (compact OD, narrow)), and bore code 56 = 280 mm; dimensions 280×380×75 mm therefore match the ISO 15 envelope. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. The 143 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.73 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. At 280 mm bore, dismount after service is by KM locknut reversal or a hydraulic nut on larger sizes; oil-injection grooves on the bigger sleeves let pressurised oil float the 23956-cck-w33 off the taper without scoring either surface.",
    "applications": [
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat",
      "split-housing plummer block arrangements with bearings swapped in situ"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "At 280 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23900-series series at 280 mm bore (380×75 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 280 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23956-cck-w33 with different sleeves.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 280 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23956-cck-w33 with different sleeves.",
      "Shaft and housing fillets must clear the bearing chamfer so the 75 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 1016/1760 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23956 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23956-cck-w33?",
        "a": "The SKF 23956 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 280 mm nominal bore, 380 mm outer diameter and 75 mm width (11.024 × 14.961 × 2.953 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1016 kN, C0 1760 kN, Pu 143 kN, reference speed 1,600 r/min, limiting speed 1,700 r/min, mass about 40000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23956-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23956-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 280 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23956-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23956-cck-w33 and 23956-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 1016/1760 kN ratings, but 23956-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23956-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23956",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23956; identical ISO 15 envelope, fits OH3956 adapter sleeve on a 260 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23956-CCK-W33",
      "SKF 23956 CCK/W33",
      "23956 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23056-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23056 CCK/W33",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 280,
    "D_mm": 420,
    "B_mm": 106,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1797,
    "static_load_kN": 2850,
    "fatigue_load_limit_kN": 224,
    "max_rpm": 1600,
    "reference_speed_rpm": 1300,
    "limiting_speed_rpm": 1600,
    "weight_g": 67000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23056-cck-w33 is the 1:12 tapered-bore execution of the 23000-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 23056-cc-w33, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. Numbering ties the bearing to its envelope: 23056-cck-w33 means spherical-roller type, dimension series 30, 280 mm bore — which is why the 420×106 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. The 224 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.59 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. Over-driving the 23056-cck-w33 up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.",
    "applications": [
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal",
      "stepped shafts fitted with withdrawal sleeves against a fixed shoulder"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At 280 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23000-series series at 280 mm bore (420×106 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The 23056-cck-w33 and its cylindrical-bore counterpart 23056-cc-w33 share envelope and load ratings (1797/2850 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "The 23056-cck-w33 and its cylindrical-bore counterpart 23056-cc-w33 share envelope and load ratings (1797/2850 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23056-cck-w33; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 1797/2850 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23056 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23056-cck-w33?",
        "a": "The SKF 23056 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 280 mm nominal bore, 420 mm outer diameter and 106 mm width (11.024 × 16.535 × 4.173 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1797 kN, C0 2850 kN, Pu 224 kN, reference speed 1,300 r/min, limiting speed 1,600 r/min, mass about 67000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23056-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23056-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 280 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23056-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23056-cck-w33 and 23056-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 1797/2850 kN ratings, but 23056-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23056-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23056",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23056; identical ISO 15 envelope, fits OH3056 adapter sleeve on a 260 mm shaft."
      },
      {
        "equiv_sku": "C3056",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3056 shares the 280×420×106 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C3056-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3056 K shares the 280×420×106 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23056-CCK-W33",
      "SKF 23056 CCK/W33",
      "23056 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23156-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23156 CCK/W33",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 280,
    "D_mm": 460,
    "B_mm": 146,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 2784,
    "static_load_kN": 4250,
    "fatigue_load_limit_kN": 335,
    "max_rpm": 1300,
    "reference_speed_rpm": 1000,
    "limiting_speed_rpm": 1300,
    "weight_g": 115000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The SKF 23156 CCK/W33 is a 280×460×146 mm spherical roller bearing with a 1:12 tapered bore — SKF catalogue execution for sleeve mounting on a 280 mm plain shaft, retaining the double-row self-aligning barrel-roller design. On the SKF nameplate, 23156-cck-w33 follows the ISO 15 convention: 2 for the spherical roller type, 31 for the dimension series 31 (medium OD, wide), final digits 56 for the 280 mm bore. Reading the suffix on 23156-cck-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 23156-cc-w33. Catalogue mass 115000 g for the 280×460×146 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. On an H adapter sleeve the 280 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 23156-cck-w33 inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.",
    "applications": [
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "At 280 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23100-series series at 280 mm bore (460×146 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 146 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 280 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23156-cck-w33 with different sleeves.",
      "Catalogue reference speed and limiting speed are different limits: the 1,000 r/min reference is a thermal criterion under load, while the 1,300 r/min limiting value is the mechanical ceiling — observe both.",
      "The 2784/4250 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23156 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23156-cck-w33?",
        "a": "The SKF 23156 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 280 mm nominal bore, 460 mm outer diameter and 146 mm width (11.024 × 18.11 × 5.748 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 2784 kN, C0 4250 kN, Pu 335 kN, reference speed 1,000 r/min, limiting speed 1,300 r/min, mass about 115000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23156-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23156-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 280 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23156-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23156-cck-w33 and 23156-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 2784/4250 kN ratings, but 23156-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23156-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23156",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23156; identical ISO 15 envelope, fits OH3156 adapter sleeve on a 260 mm shaft."
      },
      {
        "equiv_sku": "C3156",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3156 shares the 280×460×146 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C3156-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3156 K shares the 280×460×146 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23156-CCK-W33",
      "SKF 23156 CCK/W33",
      "23156 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23256-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23256 CCK/W33",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 280,
    "D_mm": 500,
    "B_mm": 176,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 3425,
    "static_load_kN": 4900,
    "fatigue_load_limit_kN": 365,
    "max_rpm": 1100,
    "reference_speed_rpm": 800,
    "limiting_speed_rpm": 1100,
    "weight_g": 165000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 23256-cck-w33 denotes the tapered-bore version (K suffix, taper 1:12) of the 23200-series spherical roller bearing: dimensioned 280×500×176 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. The code breaks down as type digit 2 (double-row spherical roller), dimension series 32 (dimension series 32 (medium OD, extra wide)), and bore code 56 = 280 mm; dimensions 280×500×176 mm therefore match the ISO 15 envelope. Reading the suffix on 23256-cck-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 23256-cc-w33. The 110.0 mm radial section height ((500−280)/2) and 165000 g catalogue mass frame a 280 mm bore bearing rated at 3425 kN C — roughly 12.23 kN of dynamic capacity per millimetre of bore before application factors. Because driving up the 1:12 taper consumes radial clearance, K executions are commonly ordered with C3 initial clearance so the residual running clearance after mounting matches the cylindrical-bore 23256-cc-w33 on an interference seat.",
    "applications": [
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat",
      "split-housing plummer block arrangements with bearings swapped in situ"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "At 280 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23200-series series at 280 mm bore (500×176 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 176 mm width changes abutment spacing, even though the 500 mm OD matches.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 280 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23256-cck-w33 with different sleeves.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 176 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "The 165000 g mass and 176 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23256-cck-w33.",
      "The 3425/4900 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23256 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23256-cck-w33?",
        "a": "The SKF 23256 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 280 mm nominal bore, 500 mm outer diameter and 176 mm width (11.024 × 19.685 × 6.929 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 3425 kN, C0 4900 kN, Pu 365 kN, reference speed 800 r/min, limiting speed 1,100 r/min, mass about 165000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23256-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23256-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 280 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23256-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23256-cck-w33 and 23256-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 3425/4900 kN ratings, but 23256-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23256-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23256",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23256; identical ISO 15 envelope, fits OH2356 adapter sleeve on a 260 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23256-CCK-W33",
      "SKF 23256 CCK/W33",
      "23256 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23960-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23960 CCK/W33",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 300,
    "D_mm": 420,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1413,
    "static_load_kN": 2500,
    "fatigue_load_limit_kN": 200,
    "max_rpm": 1600,
    "reference_speed_rpm": 1400,
    "limiting_speed_rpm": 1600,
    "weight_g": 58500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For sleeve mounting on a 300 mm shaft, SKF order number SKF 23960 CCK/W33 is the 1:12 tapered-bore spherical roller bearing in the 23900-series family (dimension series 39 (compact OD, narrow)); the cylindrical-bore equivalent is a separate order number, 23960-cc-w33. Numbering ties the bearing to its envelope: 23960-cck-w33 means spherical-roller type, dimension series 39, 300 mm bore — which is why the 420×90 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. Speed planning uses two different ceilings: 1,400 r/min thermal reference and 1,600 r/min mechanical limiting speed. At 300 mm bore, dismount after service is by KM locknut reversal or a hydraulic nut on larger sizes; oil-injection grooves on the bigger sleeves let pressurised oil float the 23960-cck-w33 off the taper without scoring either surface.",
    "applications": [
      "large mining crusher main shafts",
      "wind-turbine main shaft support",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal",
      "stepped shafts fitted with withdrawal sleeves against a fixed shoulder"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems"
    ],
    "pitfalls": [
      "At 300 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23900-series series at 300 mm bore (420×90 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The 23960-cck-w33 and its cylindrical-bore counterpart 23960-cc-w33 share envelope and load ratings (1413/2500 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "The 23960-cck-w33 and its cylindrical-bore counterpart 23960-cc-w33 share envelope and load ratings (1413/2500 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23960-cck-w33 pits long before its L10 life.",
      "The 1413/2500 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23960 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23960-cck-w33?",
        "a": "The SKF 23960 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 300 mm nominal bore, 420 mm outer diameter and 90 mm width (11.811 × 16.535 × 3.543 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1413 kN, C0 2500 kN, Pu 200 kN, reference speed 1,400 r/min, limiting speed 1,600 r/min, mass about 58500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23960-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23960-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 300 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23960-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23960-cck-w33 and 23960-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 1413/2500 kN ratings, but 23960-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23960-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23960",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23960; identical ISO 15 envelope, fits OH3960 adapter sleeve on a 280 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23960-CCK-W33",
      "SKF 23960 CCK/W33",
      "23960 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23060-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23060 CCK/W33",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 300,
    "D_mm": 460,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 2219,
    "static_load_kN": 3450,
    "fatigue_load_limit_kN": 265,
    "max_rpm": 1500,
    "reference_speed_rpm": 1200,
    "limiting_speed_rpm": 1500,
    "weight_g": 90000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF lists SKF 23060 CCK/W33 as the adapter-sleeve execution in the 23000-series range: a 300 mm nominal-bore spherical roller bearing whose 1:12 tapered inner ring is driven up a sleeve, with 460 mm OD and 118 mm width to the ISO 15 envelope. Reading the designation: the leading 2 marks a spherical roller bearing, the 30 is the ISO 15 dimension series (dimension series 30 (slim OD, extra-wide)), and the last two digits encode the 300 mm bore; the 460 mm OD and 118 mm width follow the ISO 15 general plan. Reading the suffix on 23060-cck-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 23060-cc-w33. Speed planning uses two different ceilings: 1,200 r/min thermal reference and 1,500 r/min mechanical limiting speed. Over-driving the 23060-cck-w33 up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.",
    "applications": [
      "large mining crusher main shafts",
      "wind-turbine main shaft support",
      "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat",
      "split-housing plummer block arrangements with bearings swapped in situ"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "At 300 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23000-series series at 300 mm bore (460×118 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 300 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23060-cck-w33 with different sleeves.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 300 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23060-cck-w33 with different sleeves.",
      "Shaft and housing fillets must clear the bearing chamfer so the 118 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 2219/3450 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23060 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23060-cck-w33?",
        "a": "The SKF 23060 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 300 mm nominal bore, 460 mm outer diameter and 118 mm width (11.811 × 18.11 × 4.646 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 2219 kN, C0 3450 kN, Pu 265 kN, reference speed 1,200 r/min, limiting speed 1,500 r/min, mass about 90000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23060-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23060-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 300 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23060-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23060-cck-w33 and 23060-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 2219/3450 kN ratings, but 23060-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23060-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23060",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23060; identical ISO 15 envelope, fits OH3060 adapter sleeve on a 280 mm shaft."
      },
      {
        "equiv_sku": "C3060-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3060 M shares the 300×460×118 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C3060-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3060 KM shares the 300×460×118 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23060-CCK-W33",
      "SKF 23060 CCK/W33",
      "23060 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23160-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23160 CCK/W33",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 300,
    "D_mm": 500,
    "B_mm": 160,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 3368,
    "static_load_kN": 5100,
    "fatigue_load_limit_kN": 380,
    "max_rpm": 1200,
    "reference_speed_rpm": 950,
    "limiting_speed_rpm": 1200,
    "weight_g": 150000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For sleeve mounting on a 300 mm shaft, SKF order number SKF 23160 CCK/W33 is the 1:12 tapered-bore spherical roller bearing in the 23100-series family (dimension series 31 (medium OD, wide)); the cylindrical-bore equivalent is a separate order number, 23160-cc-w33. Digit by digit, 23160-cck-w33 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 31, and bore reference 60 resolving to 300 mm; 500 mm OD and 160 mm width are the matching ISO 15 boundary values. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. Selection arithmetic: the C0/C ratio is about 1.51 (static 5100 kN against dynamic 3368 kN), typical of a spherical roller sized for heavy combined loads, and the 380 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. On an H adapter sleeve the 300 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 23160-cck-w33 inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.",
    "applications": [
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "fan and pulley shafts that need periodic bearing removal in the field",
      "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still"
    ],
    "pitfalls": [
      "At 300 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23100-series series at 300 mm bore (500×160 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23160-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "The 23160-cck-w33 and its cylindrical-bore counterpart 23160-cc-w33 share envelope and load ratings (3368/5100 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23160-cck-w33; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 3368/5100 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23160 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23160-cck-w33?",
        "a": "The SKF 23160 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 300 mm nominal bore, 500 mm outer diameter and 160 mm width (11.811 × 19.685 × 6.299 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 3368 kN, C0 5100 kN, Pu 380 kN, reference speed 950 r/min, limiting speed 1,200 r/min, mass about 150000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23160-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23160-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 300 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23160-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23160-cck-w33 and 23160-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 3368/5100 kN ratings, but 23160-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23160-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23160",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23160; identical ISO 15 envelope, fits OH3160 adapter sleeve on a 280 mm shaft."
      },
      {
        "equiv_sku": "C3160",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3160 shares the 300×500×160 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C3160-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3160 K shares the 300×500×160 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23160-CCK-W33",
      "SKF 23160 CCK/W33",
      "23160 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23260-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23260 CCK/W33",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 300,
    "D_mm": 540,
    "B_mm": 192,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 4052,
    "static_load_kN": 5850,
    "fatigue_load_limit_kN": 425,
    "max_rpm": 1000,
    "reference_speed_rpm": 750,
    "limiting_speed_rpm": 1000,
    "weight_g": 210000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF 23260 CCK/W33 in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:12), intended for an H-series adapter sleeve or AH withdrawal sleeve, with two pressed-steel cages with a floating guide ring and the same 300×540×192 mm ISO 15 outline as its cylindrical-bore counterpart. Numbering ties the bearing to its envelope: 23260-cck-w33 means spherical-roller type, dimension series 32, 300 mm bore — which is why the 540×192 mm outline swaps dimensionally with other ISO 15 bearings of the same code. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. The 425 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.44 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. Because driving up the 1:12 taper consumes radial clearance, K executions are commonly ordered with C3 initial clearance so the residual running clearance after mounting matches the cylindrical-bore 23260-cc-w33 on an interference seat.",
    "applications": [
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal",
      "stepped shafts fitted with withdrawal sleeves against a fixed shoulder"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still"
    ],
    "pitfalls": [
      "At 300 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23200-series series at 300 mm bore (540×192 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 192 mm width changes abutment spacing, even though the 540 mm OD matches.",
      "The 23260-cck-w33 and its cylindrical-bore counterpart 23260-cc-w33 share envelope and load ratings (4052/5850 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23260-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "The 23260-cck-w33 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 4052/5850 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 4052/5850 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23260 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23260-cck-w33?",
        "a": "The SKF 23260 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 300 mm nominal bore, 540 mm outer diameter and 192 mm width (11.811 × 21.26 × 7.559 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 4052 kN, C0 5850 kN, Pu 425 kN, reference speed 750 r/min, limiting speed 1,000 r/min, mass about 210000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23260-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23260-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 300 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23260-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23260-cck-w33 and 23260-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 4052/5850 kN ratings, but 23260-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23260-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23260",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23260; identical ISO 15 envelope, fits OH3260 adapter sleeve on a 280 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23260-CCK-W33",
      "SKF 23260 CCK/W33",
      "23260 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23964-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23964 CCK/W33",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 320,
    "D_mm": 440,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1480,
    "static_load_kN": 2700,
    "fatigue_load_limit_kN": 212,
    "max_rpm": 1500,
    "reference_speed_rpm": 1400,
    "limiting_speed_rpm": 1500,
    "weight_g": 61000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF 23964 CCK/W33 in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:12), intended for an H-series adapter sleeve or AH withdrawal sleeve, with two pressed-steel cages with a floating guide ring and the same 320×440×90 mm ISO 15 outline as its cylindrical-bore counterpart. Digit by digit, 23964-cck-w33 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 39, and bore reference 64 resolving to 320 mm; 440 mm OD and 90 mm width are the matching ISO 15 boundary values. Reading the suffix on 23964-cck-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 23964-cc-w33. Selection arithmetic: the C0/C ratio is about 1.82 (static 2700 kN against dynamic 1480 kN), typical of a spherical roller sized for heavy combined loads, and the 212 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Over-driving the 23964-cck-w33 up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.",
    "applications": [
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat",
      "split-housing plummer block arrangements with bearings swapped in situ"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "At 320 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23900-series series at 320 mm bore (440×90 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The 23964-cck-w33 and its cylindrical-bore counterpart 23964-cc-w33 share envelope and load ratings (1480/2700 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "The 23964-cck-w33 and its cylindrical-bore counterpart 23964-cc-w33 share envelope and load ratings (1480/2700 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23964-cck-w33 pits long before its L10 life.",
      "The 1480/2700 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23964 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23964-cck-w33?",
        "a": "The SKF 23964 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 320 mm nominal bore, 440 mm outer diameter and 90 mm width (12.598 × 17.323 × 3.543 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1480 kN, C0 2700 kN, Pu 212 kN, reference speed 1,400 r/min, limiting speed 1,500 r/min, mass about 61000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23964-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23964-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 320 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23964-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23964-cck-w33 and 23964-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 1480/2700 kN ratings, but 23964-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23964-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23964",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23964; identical ISO 15 envelope, fits OH3964 adapter sleeve on a 300 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23964-CCK-W33",
      "SKF 23964 CCK/W33",
      "23964 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23064-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23064 CCK/W33",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 320,
    "D_mm": 480,
    "B_mm": 121,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 2348,
    "static_load_kN": 3800,
    "fatigue_load_limit_kN": 285,
    "max_rpm": 1400,
    "reference_speed_rpm": 1100,
    "limiting_speed_rpm": 1400,
    "weight_g": 97000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For sleeve mounting on a 320 mm shaft, SKF order number SKF 23064 CCK/W33 is the 1:12 tapered-bore spherical roller bearing in the 23000-series family (dimension series 30 (slim OD, extra-wide)); the cylindrical-bore equivalent is a separate order number, 23064-cc-w33. The code breaks down as type digit 2 (double-row spherical roller), dimension series 30 (dimension series 30 (slim OD, extra-wide)), and bore code 64 = 320 mm; dimensions 320×480×121 mm therefore match the ISO 15 envelope. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. Selection arithmetic: the C0/C ratio is about 1.62 (static 3800 kN against dynamic 2348 kN), typical of a spherical roller sized for heavy combined loads, and the 285 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Mounting on the 1:12 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 320 mm 23064-cck-w33, checked with feeler gauges before and after drive-up.",
    "applications": [
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal",
      "stepped shafts fitted with withdrawal sleeves against a fixed shoulder"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 320 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23000-series series at 320 mm bore (480×121 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 320 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23064-cck-w33 with different sleeves.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 320 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23064-cck-w33 with different sleeves.",
      "Shaft and housing fillets must clear the bearing chamfer so the 121 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 2348/3800 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23064 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23064-cck-w33?",
        "a": "The SKF 23064 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 320 mm nominal bore, 480 mm outer diameter and 121 mm width (12.598 × 18.898 × 4.764 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 2348 kN, C0 3800 kN, Pu 285 kN, reference speed 1,100 r/min, limiting speed 1,400 r/min, mass about 97000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23064-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23064-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 320 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23064-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23064-cck-w33 and 23064-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 2348/3800 kN ratings, but 23064-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23064-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23064",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23064; identical ISO 15 envelope, fits OH3064 adapter sleeve on a 300 mm shaft."
      },
      {
        "equiv_sku": "C3064-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3064 M shares the 320×480×121 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C3064-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3064 KM shares the 320×480×121 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23064-CCK-W33",
      "SKF 23064 CCK/W33",
      "23064 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23164-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23164 CCK/W33",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 320,
    "D_mm": 540,
    "B_mm": 176,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 3923,
    "static_load_kN": 6000,
    "fatigue_load_limit_kN": 440,
    "max_rpm": 1100,
    "reference_speed_rpm": 850,
    "limiting_speed_rpm": 1100,
    "weight_g": 185000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF 23164 CCK/W33 in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:12), intended for an H-series adapter sleeve or AH withdrawal sleeve, with two pressed-steel cages with a floating guide ring and the same 320×540×176 mm ISO 15 outline as its cylindrical-bore counterpart. Reading the designation: the leading 2 marks a spherical roller bearing, the 31 is the ISO 15 dimension series (dimension series 31 (medium OD, wide)), and the last two digits encode the 320 mm bore; the 540 mm OD and 176 mm width follow the ISO 15 general plan. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. At 850 r/min reference speed the 110.0 mm-section 23164-cck-w33 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 1,100 r/min as the mechanical ceiling. Because driving up the 1:12 taper consumes radial clearance, K executions are commonly ordered with C3 initial clearance so the residual running clearance after mounting matches the cylindrical-bore 23164-cc-w33 on an interference seat.",
    "applications": [
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts",
      "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals"
    ],
    "pitfalls": [
      "At 320 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23100-series series at 320 mm bore (540×176 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23164-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "The 23164-cck-w33 and its cylindrical-bore counterpart 23164-cc-w33 share envelope and load ratings (3923/6000 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23164-cck-w33; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 3923/6000 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23164 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23164-cck-w33?",
        "a": "The SKF 23164 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 320 mm nominal bore, 540 mm outer diameter and 176 mm width (12.598 × 21.26 × 6.929 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 3923 kN, C0 6000 kN, Pu 440 kN, reference speed 850 r/min, limiting speed 1,100 r/min, mass about 185000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23164-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23164-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 320 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23164-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23164-cck-w33 and 23164-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 3923/6000 kN ratings, but 23164-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23164-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23164",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23164; identical ISO 15 envelope, fits OH3164 adapter sleeve on a 300 mm shaft."
      },
      {
        "equiv_sku": "C3164-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3164 M shares the 320×540×176 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      },
      {
        "equiv_sku": "C3164-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF CARB toroidal bearing C 3164 KM shares the 320×540×176 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23164-CCK-W33",
      "SKF 23164 CCK/W33",
      "23164 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23264-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23264 CCK/W33",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 320,
    "D_mm": 580,
    "B_mm": 208,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 4607,
    "static_load_kN": 6700,
    "fatigue_load_limit_kN": 475,
    "max_rpm": 950,
    "reference_speed_rpm": 700,
    "limiting_speed_rpm": 950,
    "weight_g": 260000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23264-cck-w33 is the 1:12 tapered-bore execution of the 23200-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 23264-cc-w33, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. Digit by digit, 23264-cck-w33 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 32, and bore reference 64 resolving to 320 mm; 580 mm OD and 208 mm width are the matching ISO 15 boundary values. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. Catalogue mass 260000 g for the 320×580×208 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. At 320 mm bore, dismount after service is by KM locknut reversal or a hydraulic nut on larger sizes; oil-injection grooves on the bigger sleeves let pressurised oil float the 23264-cck-w33 off the taper without scoring either surface.",
    "applications": [
      "large dredger and marine winch drums",
      "steel-plant continuous-caster segments",
      "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat",
      "split-housing plummer block arrangements with bearings swapped in situ"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals"
    ],
    "pitfalls": [
      "At 320 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23200-series series at 320 mm bore (580×208 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 208 mm width changes abutment spacing, even though the 580 mm OD matches.",
      "The 23264-cck-w33 and its cylindrical-bore counterpart 23264-cc-w33 share envelope and load ratings (4607/6700 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23264-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "The 23264-cck-w33 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 4607/6700 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.",
      "The 4607/6700 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23264 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23264-cck-w33?",
        "a": "The SKF 23264 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 320 mm nominal bore, 580 mm outer diameter and 208 mm width (12.598 × 22.835 × 8.189 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 4607 kN, C0 6700 kN, Pu 475 kN, reference speed 700 r/min, limiting speed 950 r/min, mass about 260000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23264-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23264-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 320 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23264-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23264-cck-w33 and 23264-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 4607/6700 kN ratings, but 23264-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23264-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23264",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23264; identical ISO 15 envelope, fits OH3264 adapter sleeve on a 300 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23264-CCK-W33",
      "SKF 23264 CCK/W33",
      "23264 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23968-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23968 CCK/W33",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 340,
    "D_mm": 460,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1490,
    "static_load_kN": 2800,
    "fatigue_load_limit_kN": 216,
    "max_rpm": 1400,
    "reference_speed_rpm": 1300,
    "limiting_speed_rpm": 1400,
    "weight_g": 67500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23968-cck-w33 is the 1:12 tapered-bore execution of the 23900-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 23968-cc-w33, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. Reading the designation: the leading 2 marks a spherical roller bearing, the 39 is the ISO 15 dimension series (dimension series 39 (compact OD, narrow)), and the last two digits encode the 340 mm bore; the 460 mm OD and 90 mm width follow the ISO 15 general plan. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. At 1,300 r/min reference speed the 60.0 mm-section 23968-cck-w33 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 1,400 r/min as the mechanical ceiling. Mounting on the 1:12 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 340 mm 23968-cck-w33, checked with feeler gauges before and after drive-up.",
    "applications": [
      "large induced-draft fan rotors",
      "SAG and ball-mill drive shafts",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal",
      "stepped shafts fitted with withdrawal sleeves against a fixed shoulder"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 340 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23900-series series at 340 mm bore (460×90 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The 23968-cck-w33 and its cylindrical-bore counterpart 23968-cc-w33 share envelope and load ratings (1490/2800 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "The 23968-cck-w33 and its cylindrical-bore counterpart 23968-cc-w33 share envelope and load ratings (1490/2800 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23968-cck-w33 pits long before its L10 life.",
      "The 1490/2800 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23968 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23968-cck-w33?",
        "a": "The SKF 23968 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 340 mm nominal bore, 460 mm outer diameter and 90 mm width (13.386 × 18.11 × 3.543 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1490 kN, C0 2800 kN, Pu 216 kN, reference speed 1,300 r/min, limiting speed 1,400 r/min, mass about 67500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23968-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23968-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 340 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23968-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23968-cck-w33 and 23968-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 1490/2800 kN ratings, but 23968-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23968-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23968",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23968; identical ISO 15 envelope, fits OH3968 adapter sleeve on a 320 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23968-CCK-W33",
      "SKF 23968 CCK/W33",
      "23968 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23168-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23168 CCK/W33",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 340,
    "D_mm": 580,
    "B_mm": 190,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 4445,
    "static_load_kN": 6800,
    "fatigue_load_limit_kN": 480,
    "max_rpm": 1000,
    "reference_speed_rpm": 800,
    "limiting_speed_rpm": 1000,
    "weight_g": 250000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23168-cck-w33 is the 1:12 tapered-bore execution of the 23100-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 23168-cc-w33, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. The code breaks down as type digit 2 (double-row spherical roller), dimension series 31 (dimension series 31 (medium OD, wide)), and bore code 68 = 340 mm; dimensions 340×580×190 mm therefore match the ISO 15 envelope. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. The 480 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.53 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. At 340 mm bore, dismount after service is by KM locknut reversal or a hydraulic nut on larger sizes; oil-injection grooves on the bigger sleeves let pressurised oil float the 23168-cck-w33 off the taper without scoring either surface.",
    "applications": [
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "fan and pulley shafts that need periodic bearing removal in the field",
      "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems"
    ],
    "pitfalls": [
      "At 340 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23100-series series at 340 mm bore (580×190 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23168-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "The 23168-cck-w33 and its cylindrical-bore counterpart 23168-cc-w33 share envelope and load ratings (4445/6800 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.",
      "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23168-cck-w33; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.",
      "The 4445/6800 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23168 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23168-cck-w33?",
        "a": "The SKF 23168 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 340 mm nominal bore, 580 mm outer diameter and 190 mm width (13.386 × 22.835 × 7.48 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 4445 kN, C0 6800 kN, Pu 480 kN, reference speed 800 r/min, limiting speed 1,000 r/min, mass about 250000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23168-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23168-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 340 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23168-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23168-cck-w33 and 23168-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 4445/6800 kN ratings, but 23168-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23168-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23168",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23168; identical ISO 15 envelope, fits OH3168 adapter sleeve on a 320 mm shaft."
      },
      {
        "equiv_sku": "C3168-M",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 3168 M shares the 340×580×190 mm envelope but catalogue C/C0 differ (4900/7500 kN vs 4445/6800 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C3168-KM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 3168 KM shares the 340×580×190 mm envelope but catalogue C/C0 differ (4900/7500 kN vs 4445/6800 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23168-CCK-W33",
      "SKF 23168 CCK/W33",
      "23168 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23268-CAK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23268 CAK/W33",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 340,
    "D_mm": 620,
    "B_mm": 224,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 5362,
    "static_load_kN": 7800,
    "fatigue_load_limit_kN": 550,
    "max_rpm": 800,
    "reference_speed_rpm": 560,
    "limiting_speed_rpm": 800,
    "weight_g": 335000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For sleeve mounting on a 340 mm shaft, SKF order number SKF 23268 CAK/W33 is the 1:12 tapered-bore spherical roller bearing in the 23200-series family (dimension series 32 (medium OD, extra wide)); the cylindrical-bore equivalent is a separate order number, 23268-cak-w33. Reading the designation: the leading 2 marks a spherical roller bearing, the 32 is the ISO 15 dimension series (dimension series 32 (medium OD, extra wide)), and the last two digits encode the 340 mm bore; the 620 mm OD and 224 mm width follow the ISO 15 general plan. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. The 550 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.45 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. Mounting on the 1:12 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 340 mm 23268-cak-w33, checked with feeler gauges before and after drive-up.",
    "applications": [
      "steel-plant continuous-caster segments",
      "large induced-draft fan rotors",
      "stepped shafts fitted with withdrawal sleeves against a fixed shoulder",
      "fan and pulley shafts that need periodic bearing removal in the field"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "roller-end scoring from starved lubricant at start-up before the grease channel purges",
      "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals"
    ],
    "pitfalls": [
      "At 340 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23200-series series at 340 mm bore (620×224 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 224 mm width changes abutment spacing, even though the 620 mm OD matches.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 224 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23268-cak-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "Catalogue reference speed and limiting speed are different limits: the 560 r/min reference is a thermal criterion under load, while the 800 r/min limiting value is the mechanical ceiling — observe both.",
      "The 5362/7800 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23268 CAK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23268-cak-w33?",
        "a": "The SKF 23268 CAK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 340 mm nominal bore, 620 mm outer diameter and 224 mm width (13.386 × 24.409 × 8.819 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 5362 kN, C0 7800 kN, Pu 550 kN, reference speed 560 r/min, limiting speed 800 r/min, mass about 335000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23268-cak-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23268-cak-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 340 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23268-cak-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23268-cak-w33 and 23268-cak-w33?",
        "a": "They share the ISO 15 envelope and the same 5362/7800 kN ratings, but 23268-cak-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23268-cak-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23268",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23268; identical ISO 15 envelope, fits OH3268 adapter sleeve on a 320 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23268-CAK-W33",
      "SKF 23268 CAK/W33",
      "23268 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23972-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23972 CCK/W33",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 360,
    "D_mm": 480,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1456,
    "static_load_kN": 2750,
    "fatigue_load_limit_kN": 220,
    "max_rpm": 1300,
    "reference_speed_rpm": 1200,
    "limiting_speed_rpm": 1300,
    "weight_g": 70500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF lists SKF 23972 CCK/W33 as the adapter-sleeve execution in the 23900-series range: a 360 mm nominal-bore spherical roller bearing whose 1:12 tapered inner ring is driven up a sleeve, with 480 mm OD and 90 mm width to the ISO 15 envelope. On the SKF nameplate, 23972-cck-w33 follows the ISO 15 convention: 2 for the spherical roller type, 39 for the dimension series 39 (compact OD, narrow), final digits 72 for the 360 mm bore. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. The 60.0 mm radial section height ((480−360)/2) and 70500 g catalogue mass frame a 360 mm bore bearing rated at 1456 kN C — roughly 4.04 kN of dynamic capacity per millimetre of bore before application factors. Mounting on the 1:12 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 360 mm 23972-cck-w33, checked with feeler gauges before and after drive-up.",
    "applications": [
      "wind-turbine main shaft support",
      "heavy rolling-mill work-roll chocks",
      "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat",
      "split-housing plummer block arrangements with bearings swapped in situ"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals"
    ],
    "pitfalls": [
      "At 360 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23900-series series at 360 mm bore (480×90 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 360 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23972-cck-w33 with different sleeves.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 360 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23972-cck-w33 with different sleeves.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 1456/2750 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23972 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23972-cck-w33?",
        "a": "The SKF 23972 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 360 mm nominal bore, 480 mm outer diameter and 90 mm width (14.173 × 18.898 × 3.543 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1456 kN, C0 2750 kN, Pu 220 kN, reference speed 1,200 r/min, limiting speed 1,300 r/min, mass about 70500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23972-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23972-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 360 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23972-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23972-cck-w33 and 23972-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 1456/2750 kN ratings, but 23972-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23972-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23972",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23972; identical ISO 15 envelope, fits OH3972 adapter sleeve on a 340 mm shaft."
      },
      {
        "equiv_sku": "C3972-M",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 3972 M shares the 360×480×90 mm envelope but catalogue C/C0 differ (1760/3250 kN vs 1456/2750 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C3972-KM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 3972 KM shares the 360×480×90 mm envelope but catalogue C/C0 differ (1760/3250 kN vs 1456/2750 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23972-CCK-W33",
      "SKF 23972 CCK/W33",
      "23972 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23172-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23172 CCK/W33",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 360,
    "D_mm": 600,
    "B_mm": 192,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 4515,
    "static_load_kN": 6950,
    "fatigue_load_limit_kN": 490,
    "max_rpm": 1000,
    "reference_speed_rpm": 750,
    "limiting_speed_rpm": 1000,
    "weight_g": 260000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF lists SKF 23172 CCK/W33 as the adapter-sleeve execution in the 23100-series range: a 360 mm nominal-bore spherical roller bearing whose 1:12 tapered inner ring is driven up a sleeve, with 600 mm OD and 192 mm width to the ISO 15 envelope. Numbering ties the bearing to its envelope: 23172-cck-w33 means spherical-roller type, dimension series 31, 360 mm bore — which is why the 600×192 mm outline swaps dimensionally with other ISO 15 bearings of the same code. Reading the suffix on 23172-cck-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 23172-cc-w33. Speed planning uses two different ceilings: 750 r/min thermal reference and 1,000 r/min mechanical limiting speed. At 360 mm bore, dismount after service is by KM locknut reversal or a hydraulic nut on larger sizes; oil-injection grooves on the bigger sleeves let pressurised oil float the 23172-cck-w33 off the taper without scoring either surface.",
    "applications": [
      "large mining crusher main shafts",
      "wind-turbine main shaft support",
      "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "smearing on the roller-raceway contact during skid starts below the minimum load"
    ],
    "pitfalls": [
      "At 360 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23100-series series at 360 mm bore (600×192 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.",
      "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 192 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 360 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23172-cck-w33 with different sleeves.",
      "Shaft and housing fillets must clear the bearing chamfer so the 192 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 4515/6950 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23172 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23172-cck-w33?",
        "a": "The SKF 23172 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 360 mm nominal bore, 600 mm outer diameter and 192 mm width (14.173 × 23.622 × 7.559 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 4515 kN, C0 6950 kN, Pu 490 kN, reference speed 750 r/min, limiting speed 1,000 r/min, mass about 260000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23172-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23172-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 360 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23172-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23172-cck-w33 and 23172-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 4515/6950 kN ratings, but 23172-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23172-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23172",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23172; identical ISO 15 envelope, fits OH3172 adapter sleeve on a 340 mm shaft."
      },
      {
        "equiv_sku": "C3172-M",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 3172 M shares the 360×600×192 mm envelope but catalogue C/C0 differ (5000/8000 kN vs 4515/6950 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      },
      {
        "equiv_sku": "C3172-KM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF CARB toroidal bearing C 3172 KM shares the 360×600×192 mm envelope but catalogue C/C0 differ (5000/8000 kN vs 4515/6950 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23172-CCK-W33",
      "SKF 23172 CCK/W33",
      "23172 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23272-CAK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23272 CAK/W33",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 360,
    "D_mm": 650,
    "B_mm": 232,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 5663,
    "static_load_kN": 8300,
    "fatigue_load_limit_kN": 570,
    "max_rpm": 750,
    "reference_speed_rpm": 530,
    "limiting_speed_rpm": 750,
    "weight_g": 375000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The SKF 23272 CAK/W33 is a 360×650×232 mm spherical roller bearing with a 1:12 tapered bore — SKF catalogue execution for sleeve mounting on a 360 mm plain shaft, retaining the double-row self-aligning barrel-roller design. On the SKF nameplate, 23272-cak-w33 follows the ISO 15 convention: 2 for the spherical roller type, 32 for the dimension series 32 (medium OD, extra wide), final digits 72 for the 360 mm bore. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. Selection arithmetic: the C0/C ratio is about 1.47 (static 8300 kN against dynamic 5663 kN), typical of a spherical roller sized for heavy combined loads, and the 570 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Because driving up the 1:12 taper consumes radial clearance, K executions are commonly ordered with C3 initial clearance so the residual running clearance after mounting matches the cylindrical-bore 23272-cak-w33 on an interference seat.",
    "applications": [
      "SAG and ball-mill drive shafts",
      "large mining crusher main shafts",
      "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat",
      "split-housing plummer block arrangements with bearings swapped in situ"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals"
    ],
    "pitfalls": [
      "At 360 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23200-series series at 360 mm bore (650×232 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 232 mm width changes abutment spacing, even though the 650 mm OD matches.",
      "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23272-cak-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 360 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23272-cak-w33 with different sleeves.",
      "Catalogue reference speed and limiting speed are different limits: the 530 r/min reference is a thermal criterion under load, while the 750 r/min limiting value is the mechanical ceiling — observe both.",
      "The 5663/8300 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23272 CAK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23272-cak-w33?",
        "a": "The SKF 23272 CAK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 360 mm nominal bore, 650 mm outer diameter and 232 mm width (14.173 × 25.591 × 9.134 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 5663 kN, C0 8300 kN, Pu 570 kN, reference speed 530 r/min, limiting speed 750 r/min, mass about 375000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23272-cak-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23272-cak-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 360 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23272-cak-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23272-cak-w33 and 23272-cak-w33?",
        "a": "They share the ISO 15 envelope and the same 5663/8300 kN ratings, but 23272-cak-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23272-cak-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23272",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23272; identical ISO 15 envelope, fits OH3272 adapter sleeve on a 340 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23272-CAK-W33",
      "SKF 23272 CAK/W33",
      "23272 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23976-CCK-W33",
    "brand": "SKF",
    "manufacturer_designation": "SKF 23976 CCK/W33",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 380,
    "D_mm": 520,
    "B_mm": 106,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 2011,
    "static_load_kN": 3800,
    "fatigue_load_limit_kN": 285,
    "max_rpm": 1200,
    "reference_speed_rpm": 1100,
    "limiting_speed_rpm": 1200,
    "weight_g": 95000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For sleeve mounting on a 380 mm shaft, SKF order number SKF 23976 CCK/W33 is the 1:12 tapered-bore spherical roller bearing in the 23900-series family (dimension series 39 (compact OD, narrow)); the cylindrical-bore equivalent is a separate order number, 23976-cc-w33. Numbering ties the bearing to its envelope: 23976-cck-w33 means spherical-roller type, dimension series 39, 380 mm bore — which is why the 520×106 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. Speed planning uses two different ceilings: 1,100 r/min thermal reference and 1,200 r/min mechanical limiting speed. After drive-up, re-check radial clearance and then swing the outer ring through its self-aligning range: the sphered raceway of the 23976-cck-w33 must still tilt ≈ 0.5–2.5° freely — a joint that binds after sleeve mounting signals excessive drive-up or a cocked sleeve.",
    "applications": [
      "large mining crusher main shafts",
      "wind-turbine main shaft support",
      "long through-shafts in conveyors, where a sleeve seat avoids a precision journal",
      "stepped shafts fitted with withdrawal sleeves against a fixed shoulder"
    ],
    "failure_modes": [
      "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating",
      "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range",
      "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve",
      "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows",
      "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems"
    ],
    "pitfalls": [
      "At 380 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.",
      "The 23900-series series at 380 mm bore (520×106 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 380 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23976-cck-w33 with different sleeves.",
      "The adapter sleeve is selected by actual shaft diameter, not by the 380 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23976-cck-w33 with different sleeves.",
      "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.",
      "The 2011/3800 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23976 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23976-cck-w33?",
        "a": "The SKF 23976 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 380 mm nominal bore, 520 mm outer diameter and 106 mm width (14.961 × 20.472 × 4.173 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 2011 kN, C0 3800 kN, Pu 285 kN, reference speed 1,100 r/min, limiting speed 1,200 r/min, mass about 95000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft."
      },
      {
        "q": "What does the K suffix mean on 23976-cck-w33?",
        "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it."
      },
      {
        "q": "Which adapter sleeve fits the 23976-cck-w33?",
        "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 380 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size."
      },
      {
        "q": "How is the 23976-cck-w33 driven up and checked?",
        "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret."
      },
      {
        "q": "What is the difference between 23976-cck-w33 and 23976-cc-w33?",
        "a": "They share the ISO 15 envelope and the same 2011/3800 kN ratings, but 23976-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23976-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23976",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Tapered-bore (1:12) sleeve-mounted execution of 23976; identical ISO 15 envelope, fits OH3976 adapter sleeve on a 360 mm shaft."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23976-CCK-W33",
      "SKF 23976 CCK/W33",
      "23976 K"
    ],
    "locale_variants": {}
  }
]